Materialia最新文献_第6页

Extrusion compression molded critical rare earth free bonded permanent magnets

IF 3

Materialia Pub Date : 2025-02-04 DOI: 10.1016/j.mtla.2025.102359

Mariappan Parans Paranthaman , Harshida Parmar , Kaustubh Mungale , James W. Kemp , Haobo Wang , Ikenna C. Nlebedim , Uday Kumar Vaidya

{"title":"Extrusion compression molded critical rare earth free bonded permanent magnets","authors":"Mariappan Parans Paranthaman , Harshida Parmar , Kaustubh Mungale , James W. Kemp , Haobo Wang , Ikenna C. Nlebedim , Uday Kumar Vaidya","doi":"10.1016/j.mtla.2025.102359","DOIUrl":"10.1016/j.mtla.2025.102359","url":null,"abstract":"<div><div>Samarium iron nitride (Sm-Fe-N) bonded magnets have emerged as promising candidates for various industrial applications due to their exceptional magnetic properties. Compounds with magnetic material 95 wt fraction (wt.%) (∼74 vol%) and 97 wt.% (∼81 vol%) of SmFeN in a polyamide (PA12) polymer binder are manufactured using a batch mixer followed by compression molding. A maximum energy product <em>(BH)</em><sub>max</sub> of 186.21 kJ.m<sup>-3</sup> (23.4 MGOe) is achieved in the 95 wt.% bonded magnets; 97 wt.% magnets had a <em>(BH)</em><sub>max</sub> of 165.52 kJ.m<sup>-3</sup> (20.8 MGOe). It is found that the degree of alignment (DoA) of 99 % is achieved in the 95 wt.% magnets, whereas the 97 wt.% magnets are limited to a DoA of 90 % respectively. The high DoA can be attributed to low particle-particle interaction during the post-magnetic field alignment process. This research provides a useful insight of binder-particle interactions at very high magnet weight fractions and their effect on magnetic strength and performance.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":"39 ","pages":"Article 102359"},"PeriodicalIF":3.0,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143350753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of initial grain size on dynamic recrystallization of ultra-large nuclear rotor steel 25Cr2Ni4MoV

IF 3

Materialia Pub Date : 2025-02-04 DOI: 10.1016/j.mtla.2025.102362

Xina Huang , Sirui Guo , Wenjing Chen

{"title":"Effect of initial grain size on dynamic recrystallization of ultra-large nuclear rotor steel 25Cr2Ni4MoV","authors":"Xina Huang , Sirui Guo , Wenjing Chen","doi":"10.1016/j.mtla.2025.102362","DOIUrl":"10.1016/j.mtla.2025.102362","url":null,"abstract":"<div><div>The effects of different initial grain sizes on dynamic recrystallization (DRX) of ultra-large nuclear rotor steel 25Cr2Ni4MoV based on the isothermal hot-compression tests under different deformation conditions were systematically investigated. The results show that the strain rate is faster, the smaller the initial grain size, the easier DRX occurs. The average grain size of DRX is positively correlated with deformation temperature, negatively correlated with strain rate, and positively correlated with initial grain size. At higher strain rates, the initial grain size has less effect on the average grain size of DRX. However, the degree of DRX is higher in the specimen with a smaller initial grain size. The DRX model was constructed of 25Cr2Ni4MoV with initial grain sizes of 33μm, 179μm, and 1577 μm based on the experimental data. The DRX average grain size models have good fitting accuracy, and the DRX percentage models are consistent with the DRX degree shown by the flow stress strain curves. when DRX occurs sufficiently and the strain rate is low, the larger the initial grain size is, the smaller the critical strain of DRX is, and the easier it is for DRX to occur.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":"39 ","pages":"Article 102362"},"PeriodicalIF":3.0,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Statically recrystallized grain size as a function of prior stored energy level in the A-286 Fe-based superalloy

IF 3

Materialia Pub Date : 2025-02-04 DOI: 10.1016/j.mtla.2025.102361

A. Potenciano , A. Nicolay , A. Da Fonseca Alvarenga , O. Danylova , J. Dairon , M. Bernacki , B. Flipon , N. Bozzolo

{"title":"Statically recrystallized grain size as a function of prior stored energy level in the A-286 Fe-based superalloy","authors":"A. Potenciano , A. Nicolay , A. Da Fonseca Alvarenga , O. Danylova , J. Dairon , M. Bernacki , B. Flipon , N. Bozzolo","doi":"10.1016/j.mtla.2025.102361","DOIUrl":"10.1016/j.mtla.2025.102361","url":null,"abstract":"<div><div>A-286 alloy is a Fe-based superalloy used in various engines and gas turbine components. During manufacturing, this alloy is submitted to a solution heat treatment that provides good formability for the subsequent deformation steps. Hence, a good control of grain size evolution is required to avoid the formation of a broad grain size distribution or the growth of abnormally large grains. In this work, a well-controlled strain gradient has been generated by means of indentation tests at room temperature. A specific strain level, calculated by finite element simulations, and the associated dislocation density estimated by the EBSD technique, lead to the activation of selective grain growth during heat treatment after a given incubation time. This study on cold-deformed A-286 alloy allowed a quantitative assessment of recrystallized grain size dependence on stored energy and the identification of the critical stored energy value for grain nucleation, providing a better understanding of A-286 static recrystallization behavior.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":"39 ","pages":"Article 102361"},"PeriodicalIF":3.0,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143378857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dissociative adsorption of in-situ grown NiBi with oxygen enabling lower friction and wear of nickel-based composite coating at elevated temperature

IF 3

Materialia Pub Date : 2025-02-04 DOI: 10.1016/j.mtla.2025.102364

Huwei Sun , Zaixiu Yang , Shanhong Wan , Gewen Yi , Peiying Shi , Sang The Pham , Anh Kiet Tieu , Benbin Xin , Juanjuan Chen , Wenzhen Wang , Yu Shan , Junyang Wang

{"title":"Dissociative adsorption of in-situ grown NiBi with oxygen enabling lower friction and wear of nickel-based composite coating at elevated temperature","authors":"Huwei Sun , Zaixiu Yang , Shanhong Wan , Gewen Yi , Peiying Shi , Sang The Pham , Anh Kiet Tieu , Benbin Xin , Juanjuan Chen , Wenzhen Wang , Yu Shan , Junyang Wang","doi":"10.1016/j.mtla.2025.102364","DOIUrl":"10.1016/j.mtla.2025.102364","url":null,"abstract":"<div><div>Ni-based alloy coatings are increasingly being used in many high-temperature mechanical systems, although they may not necessarily achieve good friction and wear. This study introduces an innovative approach for delivering self-lubricating capability to Ni-based coatings by combining atmospheric plasma spraying (APS) and hot isostatic pressing (HIP). We demonstrate that HIP improves the densification, hardness, and adhesive strength of the coatings while offering outstanding friction reduction and wear resistance at 400 °C. This superior performance is attributed to the dissociative adsorption of in-situ NiBi compounds with oxygen, which results in the formation of BiNiO<sub>3</sub> and NiO during friction. These compounds are key to the mitigation of interfacial adhesion and the formation of low-shear oxide tribolayers. This study provides a new method for preparing low-friction and anti-wear Ni-based coatings and outlines the chemical design rules for their self-lubricating properties through surface microstructural characterizations and atomic calculations.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":"39 ","pages":"Article 102364"},"PeriodicalIF":3.0,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143313275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The evolution of microscopic damage mechanisms during actuation fatigue cycling in high temperature shape memory alloys

IF 3

Materialia Pub Date : 2025-02-03 DOI: 10.1016/j.mtla.2025.102356

Faith Gantz , Alexander Demblon , Ibrahim Karaman , Marcus L. Young

{"title":"The evolution of microscopic damage mechanisms during actuation fatigue cycling in high temperature shape memory alloys","authors":"Faith Gantz , Alexander Demblon , Ibrahim Karaman , Marcus L. Young","doi":"10.1016/j.mtla.2025.102356","DOIUrl":"10.1016/j.mtla.2025.102356","url":null,"abstract":"<div><div>Shape memory alloys (SMAs) offer an alternative lightweight and compact option to conventional actuators as solid-state actuators due to their high energy density. Before commercial use in the automotive or aerospace industries can be realized, the durability and functionality of high temperature SMAs (HTSMAs), with operating temperatures exceeding 100 °C, need to be characterized by examining the actuation fatigue properties. Macroscopic evaluation has been well-documented, but to further improve the thermomechanical response and actuation fatigue then the governing microscopic damage mechanisms need to be identified. With this motivation, the effects of upper cycle temperature (UCT) levels on actuation fatigue properties of a Ni-rich Ni<sub>50.3</sub>Ti<sub>29.7</sub>Hf<sub>20</sub> HTSMA were investigated in combination with high energy synchrotron radiation X-ray diffraction (SR-XRD) experiments. Fatigue tests were performed to compare three UCT levels above austenite finish (A<sub>f</sub>) temperature under a constant load of 300 MPa and SR-XRD was used to determine the residual micro-strains associated with accumulated strain. Overheating much greater than the A<sub>f</sub> (in this case, >100 °C) transformation temperature leads to oxidation and slip deformation associated with grain growth. Whereas operating at temperatures slightly above A<sub>f</sub> (<100 °C) was shown to extend fatigue life by preferring twinning deformation. Existing defects and high strain rate conditions will cause actuation strain degradation as a consequence of multiple transformation fronts accumulating stress concentrators at these initiation sites. Lower UCT allows damage deformation to propagate slowly across the sample so that deformation is primarily associated with twinning mechanisms before slip for the duration of the fatigue test.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":"39 ","pages":"Article 102356"},"PeriodicalIF":3.0,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143378856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Aluminium-induced modulation of reaction kinetics and polytype formation in silicon carbide synthesized through high-energy ball milling

IF 3

Materialia Pub Date : 2025-02-01 DOI: 10.1016/j.mtla.2025.102357

Sarah Morais Bezerra , Gábor Bortel , Nikoletta Jegenyes , Adam Gali , David Beke

{"title":"Aluminium-induced modulation of reaction kinetics and polytype formation in silicon carbide synthesized through high-energy ball milling","authors":"Sarah Morais Bezerra , Gábor Bortel , Nikoletta Jegenyes , Adam Gali , David Beke","doi":"10.1016/j.mtla.2025.102357","DOIUrl":"10.1016/j.mtla.2025.102357","url":null,"abstract":"<div><div>Silicon carbide (SiC) is a versatile material employed in a broad range of applications, including abrasives, power electronics, and emerging quantum technologies. It is widely recognized as a high-performance technical ceramic, owing to its good thermal conductivity, high hardness, and chemical stability. Cost-effective strategies for synthesizing SiC with application-specific properties are thus highly desired, stimulating the development of numerous approaches to produce high-quality products. Direct synthesis of SiC from elemental silicon and carbon offers precise control over crystal size and phase purity at temperatures lower than those required for the reaction between SiO₂ and carbon. Nonetheless, further reductions in reaction temperature are desired to enhance both cost- and energy efficiency. This study explores the combined effects of high-energy ball milling, combustion synthesis, and aluminium addition on the formation of SiC. Both the precursors and the resultant products were comprehensively characterized to elucidate the influence of these processing methods. The results indicate that aluminium, in the studied 0–20 mol% concentration range, reduces the reaction time and increases the prevalence of hexagonal inclusions. In contrast, wet high-energy ball milling demonstrates only a marginal mechanical activation effect, which contradicts the previous results of dry milling. Furthermore, the oversaturation threshold (5 mol% Al in SiC) critically impacts both the synthesis process and the resulting material properties, thereby demonstrating the importance of composition control during synthesis.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":"39 ","pages":"Article 102357"},"PeriodicalIF":3.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143313224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A TEM study of microstructure inhomogeneity in a superalloy powder: Implications for microstructure development

IF 3

Materialia Pub Date : 2025-01-30 DOI: 10.1016/j.mtla.2025.102347

Hiroto S. Kitaguchi , Shiuli Banerjee , Himanshu Vashishtha , Wolfgang Theis , Paul Bowen , David M. Collins

{"title":"A TEM study of microstructure inhomogeneity in a superalloy powder: Implications for microstructure development","authors":"Hiroto S. Kitaguchi , Shiuli Banerjee , Himanshu Vashishtha , Wolfgang Theis , Paul Bowen , David M. Collins","doi":"10.1016/j.mtla.2025.102347","DOIUrl":"10.1016/j.mtla.2025.102347","url":null,"abstract":"<div><div>For nickel-base superalloys fabricated from gas-atomised powders, the final microstructure must be related to the characteristics of the powder itself. This work provides detailed characterisation, primarily using transmission electron microscopy, to link microstructure, composition and crystallography of the nickel-base superalloy, RR1000. In the virgin state, the powder has significant chemical inhomogeneity between and within powder particles, including evidence of <span><math><msup><mrow><mi>γ</mi></mrow><mrow><mo>′</mo></mrow></msup></math></span> structural ordering. From solute enrichment remnant from solidification, these regions contain multiple phases including MC, M<sub>23</sub>C<span><math><msub><mrow></mrow><mrow><mn>6</mn></mrow></msub></math></span> and sigma (<span><math><mi>σ</mi></math></span>). Where the local composition is close to the stoichiometric chemistry of the respective phase, they evidently formed without the need for long range diffusional processes that are typically required for their formation. When the powder is heated, these phases, including <span><math><msup><mrow><mi>γ</mi></mrow><mrow><mo>′</mo></mrow></msup></math></span>, are retained. This study highlights how non-equilibrium characteristics of a gas atomised powder must infleuence microstructural development and, consequently, the selection of subsequent processing steps.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":"39 ","pages":"Article 102347"},"PeriodicalIF":3.0,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143172318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The effect of silicon and boron doping on the microstructure of arc melted boron carbide

IF 3

Materialia Pub Date : 2025-01-28 DOI: 10.1016/j.mtla.2025.102353

Zeynep Ayguzer Yasar , Kent Christian , Richard A. Haber

{"title":"The effect of silicon and boron doping on the microstructure of arc melted boron carbide","authors":"Zeynep Ayguzer Yasar , Kent Christian , Richard A. Haber","doi":"10.1016/j.mtla.2025.102353","DOIUrl":"10.1016/j.mtla.2025.102353","url":null,"abstract":"<div><div>In this study, B<sub>4</sub>C, boron-doped boron carbide, and Si/B co-doped boron carbide (1.5 at.% and 2.5 at.% made with Si and SiB<sub>6</sub>) were arc melted. Melted ingots were characterized by X-Ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) with energy-dispersive X-ray spectroscopy (EDS), Raman spectroscopy, and Vickers hardness. According to the results, doping of boron carbide with both silicon and boron was successfully achieved by arc melting. When Si/B doped boron carbide samples were examined, the same boron carbide, silicon boron, and silicon phases were found regardless of the silicon source. It was observed that dissolving silicon in boron carbide was more difficult than dissolving boron in boron carbide, and therefore, diffusion of silicon is believed to be rather short distance. It was determined that Si/B co-doped samples had higher hardness values than undoped B<sub>4</sub>C and boron doped B<sub>6.5</sub>C. Moreover, since very high temperatures are reached in the arc melting method, it has been determined that the oxides present in the starting powders evaporate during the melting process and therefore the oxygen content of the final melt ingots is very low.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":"39 ","pages":"Article 102353"},"PeriodicalIF":3.0,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143313222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Heterostructural decomposition in V1-xWxB2-Δ films induced by B deficiency

IF 3

Materialia Pub Date : 2025-01-28 DOI: 10.1016/j.mtla.2025.102351

Katarína Viskupová , Tomáš Fiantok , Branislav Grančič , Peter Švec Jr , Tomáš Roch , Martin Truchlý , Viktor Šroba , Leonid Satrapinskyy , Peter Kúš , Marián Mikula

{"title":"Heterostructural decomposition in V1-xWxB2-Δ films induced by B deficiency","authors":"Katarína Viskupová , Tomáš Fiantok , Branislav Grančič , Peter Švec Jr , Tomáš Roch , Martin Truchlý , Viktor Šroba , Leonid Satrapinskyy , Peter Kúš , Marián Mikula","doi":"10.1016/j.mtla.2025.102351","DOIUrl":"10.1016/j.mtla.2025.102351","url":null,"abstract":"<div><div>Transition metal borides (TMB<sub>y</sub>) represent a structurally rich group of materials with attractive physical properties, including high hardness and high melting points, making them promising candidates for applications in extreme conditions. Considerable attention has been paid to overstoichiometric TMB<sub>2+Δ</sub> films with hexagonal α-<em>P6/mmm</em> structure exhibiting super-hardness attributed to high cohesive strength between excess-boron tissue phase and crystalline nanocolumns. However, positive effects of reducing the boron content in terms of toughness and oxidation resistance have been reported. Lowering the boron to metal ratio can have various effects on structure and stability, depending on the specific diboride system and its affinity to boron vacancies. In this work, we study the influence of boron understoichiometry on structure and thermal stability of vanadium tungsten diboride films. We present results of high-resolution scanning transmission electron microscopy showing that boron deficiency leads to a high density of planar defects, including anti-phase boundaries (APB-2i), the accumulation of which enables the formation of WB-<em>Cmcm</em> areas coherently included in the hexagonal VB<sub>2</sub>-<em>P6/mmm</em> structure. The observation is supported by density functional theory calculations showing that since the presence of vacancies is favored by the α-WB<sub>2</sub> and not convenient for the α-VB<sub>2</sub> system, there is an increased probability of decomposition into stoichiometric VB<sub>2</sub> and boron deficient WB<sub>z<2</sub> products. Additionally, we report on other types of planar defects, such as twinning, and discuss their role in local formation of other boride phases within the <em>Cmcm</em> structure.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":"39 ","pages":"Article 102351"},"PeriodicalIF":3.0,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143313274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Deciphering the role of microstructural length scale on corrosion behaviour of carbide free nano-structured bainite using immersion in chloride solution

IF 3

Materialia Pub Date : 2025-01-28 DOI: 10.1016/j.mtla.2025.102354

Bhawesh Chhajed , Kritika Singh , Aparna Singh

{"title":"Deciphering the role of microstructural length scale on corrosion behaviour of carbide free nano-structured bainite using immersion in chloride solution","authors":"Bhawesh Chhajed , Kritika Singh , Aparna Singh","doi":"10.1016/j.mtla.2025.102354","DOIUrl":"10.1016/j.mtla.2025.102354","url":null,"abstract":"<div><div>Nano-structured bainite (NSB) shows superior strength, ductility, and toughness owing to the nanometric microstructure. This study aims to provide a comprehensive understanding about the effect of microstructural refinement on aqueous corrosion behaviour of NSB while keeping the bainitic volume fraction constant. Two different austenitization temperatures (900 °C and 1000 °C) followed by austempering at 250 °C resulted in different prior austenite grain size (PAGS) which led to correspondingly different bainitic lath thickness. The specimens were subjected to immersion test in 3.5 wt% NaCl solution for 10, 20, 30, 40 and 50 days. Specimen having finer bainitic lath thickness displayed lower corrosion rate and weight loss due to immersion. Cross sectional imaging using scanning electron microscope (SEM) revealed shallower penetration of electrolyte in case of finer bainitic lath specimen resulting in formation of a compact, uniform and adhered corrosion layer in comparison to a loose and non-uniform layer observed for coarser bainitic lath specimen. Raman spectroscopy and x-ray photoelectron spectroscopy (XPS) revealed oxyhydroxides to be present in larger proportions in specimens subjected to immersion for 10 days while specimens subjected to immersion for 30 days had higher proportions of oxides as compared to oxyhydroxides. Further immersion up to 50 days resulted in higher proportions of oxyhydroxides in case of both heat treated specimens. Electrochemical tests such as electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) conducted on specimens immersed for 30 days showed that finer bainitic lath specimen displays higher corrosion resistance despite having thinner corrosion layer owing to its high compactness.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":"39 ","pages":"Article 102354"},"PeriodicalIF":3.0,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143313223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0