Materials Science and Engineering: A最新文献

{"title":"Plastic damage mechanism and grain orientation evolution along the thickness direction in heavy-walled submarine pipelines during the progressive forming process","authors":"Ling-zhi Xu ,&nbsp;Gui-ying Qiao ,&nbsp;Ying-long Ma ,&nbsp;Yu Gu ,&nbsp;Kai Xu ,&nbsp;Xiao-wei Chen ,&nbsp;Fu-ren Xiao","doi":"10.1016/j.msea.2024.147524","DOIUrl":"10.1016/j.msea.2024.147524","url":null,"abstract":"<div><div>The progressive forming process (JCOE process) results in the creation of a high-strength submarine pipeline with substantial wall thickness. However, the accumulated of strain during the transverse forming process leads to increased disparities in the microstructure of layers with varying thicknesses, thereby impacting the longitudinal mechanical properties of the pipes. This investigation explores the combination of three-dimensional (3D) simulation and experimental methods allowed for comparison of how the JCOE process impacts the mechanisms of plastic damage and the evolution of longitudinal grain orientation in layers with varying thicknesses in pipes. It was revealed in the findings that the increase in accumulated strain led to a rise in dislocation density within the grain. This exacerbated dislocation pile-up at ferrite boundaries and ferrite/bainite interfaces and raised the level of plastic damage. A reduction in grain size enhanced the strain gradient in the surface layer, resulting in hindered advancement of plastic damage. From the 1/2-thickness layer towards the surface layer, the crystal orientation tended predominantly towards the [110] direction with the accumulation of strain. At a lower level of the accumulated plastic strain, the predominant orientation of the texture in the 1/2-thickness layer was directed towards the α-fibers. As the accumulated deformation progressed into the 1/4-thickness layer, the α-fiber transformed to a {001}&lt;110&gt; type texture under the combined effect of conjugated slip and cross-slip. The transformation of the {001}&lt;110&gt; type texture into the {112}&lt;110&gt; type texture ensued as the accumulated deformation progressed to the surface layer and tended to shift to the {111}&lt;110&gt; type texture. The results of this work guide methods to control the microstructure and properties of heavy-wall dual-phase steel submarine pipelines.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"919 ","pages":"Article 147524"},"PeriodicalIF":6.1,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microstructure and crack propagation behavior of 2195 Al–Li alloy with different orientations in the friction stir welding nugget zone","authors":"Ke-jin Song ,&nbsp;Yun-hua Wu ,&nbsp;Pei-chen Liang ,&nbsp;Xuesong Fu ,&nbsp;Zheng-gen Hu ,&nbsp;Guo-qing Chen ,&nbsp;Wen-long Zhou","doi":"10.1016/j.msea.2024.147537","DOIUrl":"10.1016/j.msea.2024.147537","url":null,"abstract":"<div><div>The 2195 Al–Li alloy is widely used in the aerospace field, where using friction stir welding technology can achieve lightweight and reduced wear designs for components. Fatigue failure, as one of the main modes of damage affecting the life and reliability of structural components, is particularly significant. This paper thoroughly explores the differences in microstructure and fatigue crack propagation behavior between the advancing side and retreating side of the friction stir welded joint in different sampling directions, providing a theoretical basis for enhancing the fatigue performance of friction stir welds. Characterization of the microstructure of the samples was performed using Electron Backscatter Diffraction (EBSD) and X-Ray Diffraction (XRD), and the fatigue properties were investigated using fatigue crack propagation rate curves and crack growth rate curves. The results indicate that the longitudinal base material grains tend to a fibrous structure, while the axial base material grains are distributed in a lamellar fashion. Compared to the advancing side of weld nugget zone, the retreating side of weld nugget zone has significantly reduced grain size and texture types. The fatigue performance of the retreating side of the weld nugget zone is superior to that of the advancing side, and the circumferential welds outperform the longitudinal welds in terms of fatigue performance.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"920 ","pages":"Article 147537"},"PeriodicalIF":6.1,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of solid solution time on microstructure and precipitation strengthening of novel maraging steels","authors":"T.Z. Xu ,&nbsp;T. Wang ,&nbsp;M.S. Wang ,&nbsp;S. Zhang ,&nbsp;C.H. Zhang ,&nbsp;C.L. Wu ,&nbsp;X.Y. Sun ,&nbsp;H.T. Chen ,&nbsp;J. Chen","doi":"10.1016/j.msea.2024.147535","DOIUrl":"10.1016/j.msea.2024.147535","url":null,"abstract":"<div><div>Effective subsequent heat treatment is crucial for achieving the desired microstructure and excellent mechanical properties in laser-deposited high-performance maraging steel. In this paper, we systematically investigate the synergistic relationship and tuning mechanism of different solution treatment times on the microstructure-property synergy of new maraging steels fabricated using laser direct energy deposition (LDED). To determine the optimal heat treatment process, solution treatment was conducted at 840 °C for varying durations, followed by aging at 530 °C for 2 h to induce precipitation strengthening. The results indicate that after 2 h of solution treatment, the alloy exhibits optimal ductility with an elongation of 7.90 % ± 0.15 %, attributed to the refinement of the martensitic matrix and precipitated phases, along with the formation of a small amount of residual austenite. When the solution treatment time is extended to 4 h, the alloy achieves its highest tensile strength, reaching 1958 ± 24 MPa. However, the elongation decreases to 7.31 % ± 0.12 % due to the coarsening of the martensite and secondary phase particles. After 6 h of solution treatment, significant coarsening and aggregation of the martensite and Fe₂Mo intermetallic compounds markedly reduce the hardness, strength, and toughness of the alloy. By adjusting the solution treatment time, the size, morphology, and distribution of the martensitic matrix, Fe₂Mo, and nanoscale precipitated phases play a critical role in the strengthening and fracture processes. Therefore, optimizing the precipitation behavior of the martensitic matrix and Fe₂Mo intermetallic compounds through rational solution heat treatment is key to enhancing the mechanical properties of laser-deposited new maraging steels.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"920 ","pages":"Article 147535"},"PeriodicalIF":6.1,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Size and microstructural factors affecting the micro-hole expansion ratio and fracture toughness of dual phase steel sheets","authors":"Soudip Basu ,&nbsp;Balila Nagamani Jaya ,&nbsp;Rohit Kumar Yadav ,&nbsp;Sarbari Ganguly ,&nbsp;Monojit Dutta","doi":"10.1016/j.msea.2024.147517","DOIUrl":"10.1016/j.msea.2024.147517","url":null,"abstract":"<div><div>The microscopic hole expansion ratio (<em>μHER</em>) of a ferritic-martensitic (∼10 %) dual phase steel was measured using a novel <em>in-situ</em> scanning electron microscope based miniature hole expansion setup. The effect of extrinsic parameters such as specimen thickness and machining conditions, and intrinsic parameters such as hardness differential <em>(ΔH =H</em>_<em>α</em>'-<em>H</em>_<em>α</em>) between the soft ferrite matrix and hard martensite islands on <em>μHER</em> values was studied. The miniature HER setup allowed site-specific measurement of microscopic strain localizations in the DP microstructure through high resolution digital image correlation under the triaxial state of stress. The results from these experiments were juxtaposed against another triaxial state of stress ahead of a crack tip, in a fracture toughness (<em>J</em>_<em>Ic</em>) test using the single edge notched tensile (SENT) geometry for the same thickness and microstructural conditions of DP steel. It was found that the tempered DP specimen with lower <em>ΔH</em> resulted in a ∼45 % higher <em>μHER</em> as compared to the as-received DP600, although both specimens exhibited similar <em>J</em>_<em>Ic</em> values. This apparent discrepancy between the trends in <em>μHER</em> and <em>J</em>_<em>Ic</em> values was explained in terms of the differences in failure modes, triaxiality and plastic zone evolution in the two conditions.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"919 ","pages":"Article 147517"},"PeriodicalIF":6.1,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synergistic strengthening mechanism of Mg and Si on Cu-Fe alloys with high strength and high conductivity","authors":"Xiangyu Yu ,&nbsp;Yanlong Xiang ,&nbsp;Yuke Li ,&nbsp;Junbin Cheng ,&nbsp;Liuxiong Luo ,&nbsp;Shen Gong ,&nbsp;Zhou Li ,&nbsp;Xiaojun Li ,&nbsp;Qiru Wang","doi":"10.1016/j.msea.2024.147534","DOIUrl":"10.1016/j.msea.2024.147534","url":null,"abstract":"<div><div>In this study, high strength and conductivity Cu-Fe-Si-Mg alloys were produced by casting and multi-stage thermos-mechanical treatment (MTT). The electrical conductivity, yield strength, tensile strength and elongation of the Cu-2.5Fe-0.1Si-0.15 Mg alloys were 68.23 %IACS, 653 MPa, 692 MPa and 4.35 %, respectively. The addition of Mg was beneficial to reduce the generalized planar fault energy and increase the density of substructure. Meanwhile, there was a tendency for Mg atoms to segregate at the interfacial region where the second phase met the copper. The segregation of Mg effectively inhibited the growth of precipitates. There was a dramatic improvement in the ability of the second phase to pin dislocations. The overall properties of the Cu-Fe alloys were excellent. The synergistic addition of Mg and Si significantly improved the mechanical properties of the alloys, but the electrical conductivity slightly declined.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"920 ","pages":"Article 147534"},"PeriodicalIF":6.1,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Combined effects of carbon content and heat treatment on the high-temperature tensile performance of modified IN738 alloy processed by laser powder bed fusion","authors":"Han Zhang ,&nbsp;Quanquan Han ,&nbsp;Zhenhua Zhang ,&nbsp;Yanzhen Liang ,&nbsp;Liqiao Wang ,&nbsp;Hongyuan Wan ,&nbsp;Kaiju Lu ,&nbsp;Zhengjiang Gao","doi":"10.1016/j.msea.2024.147538","DOIUrl":"10.1016/j.msea.2024.147538","url":null,"abstract":"<div><div>Laser powder bed fusion (LPBF) is an advanced manufacturing technology used in processing nickel-based superalloys, notably for aero-engine components. One such material, the LPBF-fabricated IN738 superalloy, is prone to significant cracking issues. This study found that a change in carbon content (the optimal content of which was also determined) effectively mitigated the cracking. This study has systematically investigated the impact of different heat treatments on microstructural alterations and high-temperature tensile properties. The addition of 0.55 wt% of graphite proved effective in entirely inhibiting cracking in LPBF-fabricated IN738 specimens. Pre-alloyed IN738-M powder with the optimal carbon content was then produced and processed via LPBF to assess its formability. The as-built specimen revealed the presence of continuous carbides along the subgrain boundaries. Heat treatment promoted the transformation of substructured grains into recrystallised grains, accompanied by the precipitations of carbides and the γ′ phase; their morphologies were strongly determined by the solution treatment temperature. Differential scanning calorimetry measurements were employed to elucidate the differing microstructural states following distinct heat-treatment regimens. Under a 900 °C testing condition, stress-relieved (SR) specimens were found to exhibit superior performance, demonstrating an ultimate tensile stress (UTS) value of 843.6 MPa, a yield strength (YS) of 807.3 MPa and an elongation of 8.54 %. Notably, SR specimens also exhibited the highest UTS and YS values at 1000 °C, measuring 380.0 MPa and 346.5 MPa, respectively. This study's findings will furnish valuable insights for researchers who aim to enhance the high-temperature tensile performance of LPBF-fabricated nickel-based superalloys.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"920 ","pages":"Article 147538"},"PeriodicalIF":6.1,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Achieving strength-ductility synergy of ODS-FeCrAl alloys via heterostructured strategy","authors":"Dingbo Sun,&nbsp;Zheng Lu,&nbsp;Xiaolong Li,&nbsp;Shang Gao,&nbsp;Hui Li","doi":"10.1016/j.msea.2024.147536","DOIUrl":"10.1016/j.msea.2024.147536","url":null,"abstract":"<div><div>Oxide dispersion strengthened (ODS)-FeCrAl alloys are candidate structural materials for advanced nuclear reactor applications, which have excellent strength and radiation tolerance but low ductility. In this study, a novel ODS-FeCrAl heterostructured composite, reinforced with FCC-structured ODS-CoCrFeNiMn high-entropy particles, was prepared by using mechanical alloying and spark plasma sintering to achieve the strength-ductility synergy. The effect of different reinforcement contents (0, 10, 15 and 20 wt%, designated as RC-0, RC-10, RC-15, and RC-20, respectively) on the microstructure and mechanical properties of the composites was investigated. The results showed that the unreinforced reference alloy, RC-0, consists of BCC-structured ODS-FeCrAl matrix and high-density oxides. In the RC-10, RC-15, and RC-20 composites, in addition to the ODS-FeCrAl matrix and nanoscale oxides, FCC-structured ODS-CoCrFeNiMn high-entropy reinforcement with ultrafine grain size and FCC transition layer with gradient grain size are observed. As the reinforcement content increases, the thickness of transition region increases. The composites show an increase in ultimate compressive strength and compressive strain with increasing reinforcement content in the following order: 2951 MPa/33.6 %, 3169 MPa/40.0 %, 3290 MPa/43.2 %, and 3489 MPa/48.8 %. And the compressive yield strength exhibits an initial increase and subsequent decrease, i.e. 1523 MPa (RC-0), 1680 MPa (RC-10), 1635 MPa (RC-15), and 1355 MPa (RC-20), respectively. The increase in yield strength is mainly attributed to hetero-deformation induced (HDI) strengthening and reinforcement hardening. The improvement in ductility is mainly attributed to the HDI work hardening and the suppression of microcrack formation and propagation at prior powder boundaries.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"920 ","pages":"Article 147536"},"PeriodicalIF":6.1,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663404","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tension-compression asymmetry and the grain-scale slip behavior in untextured Mg-10Gd-3Y-0.5Zr (wt.%)","authors":"Xianhua Zheng ,&nbsp;Ran Ni ,&nbsp;Zhiwei Jiang ,&nbsp;Hao Zhou ,&nbsp;Ying Zeng ,&nbsp;Dongdi Yin","doi":"10.1016/j.msea.2024.147533","DOIUrl":"10.1016/j.msea.2024.147533","url":null,"abstract":"<div><div>Mg-10Gd-3Y-0.5Zr (wt.%) is a recently developed high-performance cast Mg alloy with random texture. The present work found that both strength and ductility of this alloy were significantly larger for compression than that for tension, i.e. the mechanical properties exhibited tension-compression asymmetry (TCA), although no twins were observed. To understand this uncommon behavior, the relative activity of individual slip modes and slip-slip interactions during deformation were analyzed in detail at grain scale, based on <em>quasi-in-situ</em> experiments, combined with slip trace analysis and EBSD technique. Significantly asymmetric slip behavior was observed. Although basal slip always dominated for both tension and compression, the relative activity of pyramidal II &lt;c+a&gt; (PyrIICA) slip for tension was 2.6 times higher than that for compression. Statistical analysis of the angle between the active slip plane normal and the loading direction implied that the PyrIICA slip was more easily activated when the slip plane under tension. The asymmetric activity of PyrIICA slip was believed to contribute to the observed yield strength TCA. What’s more, almost all possible combinations of cross slip and slip transfer for total 30 slip systems were observed and analyzed in detail only during compression, while such behavior was not observed under tension. The strong slip-slip interactions induced by massive cross slips and effectively accommodated intergranular deformation by slip transfer were consistent with the well-balanced strain hardening, which resulted in improved ultimate strength and ductility for compression.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"920 ","pages":"Article 147533"},"PeriodicalIF":6.1,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Exceptional tensile strength-ductility synergy in friction stir processed Mg-Y-Nd-Zr alloy achieved through bimodal grain size distribution","authors":"Annayath Maqbool ,&nbsp;Nadeem Fayaz Lone ,&nbsp;Noor Zaman Khan ,&nbsp;Arshad Noor Siddiquee ,&nbsp;Daolun Chen","doi":"10.1016/j.msea.2024.147521","DOIUrl":"10.1016/j.msea.2024.147521","url":null,"abstract":"<div><div>For advanced structural and functional applications, achieving a balanced strength-ductility trade-off is crucial. Nevertheless, the enhancement of strength often results in reduction of ductility, a phenomenon more pronounced in nano-grained materials. Although bimodal grain structures offer potential solution to address this issue, their realization generally involve complex processing steps. Herein, a bimodal grain structure was developed in Mg-Y-Nd-Zr alloy through Friction Stir Processing (FSP). The developed microstructure contains ultra-fine grains of about 2 μm interspersed within fine grains of ∼15 μm. The processed specimen displayed an enhanced tensile strength of 195 MPa, while simultaneously achieving an exceptional elongation of 31 %. These remarkable properties are attributed to the distinct bimodal grain structure, which effectively delays the onset of plastic instability, thereby enhancing strength, uniform elongation, and the rate of work hardening.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"919 ","pages":"Article 147521"},"PeriodicalIF":6.1,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of aging temperature on the microstructural evolution and mechanical properties of 18Ni (200) maraging steel","authors":"Yujian Zhang,&nbsp;Yanmei Li,&nbsp;Xiangtao Deng","doi":"10.1016/j.msea.2024.147497","DOIUrl":"10.1016/j.msea.2024.147497","url":null,"abstract":"<div><div>Herein, we used transmission electron microscopy (TEM), electron backscattering diffraction (EBSD), and X-ray diffractometry (XRD) to investigate the effects of different aging temperatures on reversed austenite and precipitates in 18Ni (200) maraging steel, as well as their evolving patterns of cryogenic toughness and strength. Aging at 510 °C was found to enhance cryogenic toughness at −196 °C and deliver peak strength, which is attributable to the significant aging-strengthening effect and the reversed austenite. Furthermore, this study investigated the factors that contribute to the formation and high stability of reversed austenite and quantitatively assessed the contributions of aging strengthening, dislocation strengthening, and grain-boundary strengthening to yield strength at various aging temperatures.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"919 ","pages":"Article 147497"},"PeriodicalIF":6.1,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}