ChemRN: Metals & Alloys (Topic)最新文献_第2页

The Evolution of Σ3 Grain Boundary in Strip-Cast Hi-B Grain Orientated Fe-6.5%Si Alloy 带铸Hi-B晶粒取向Fe-6.5%Si合金Σ3晶界演变

ChemRN: Metals & Alloys (Topic) Pub Date : 2020-11-30 DOI: 10.2139/ssrn.3737309

Yuanxiang Zhang, G. Yuan, Yang Wang, F. Fang, Weina Zhang, Xiao-ming Zhang, Guo-dong Wang

引用次数: 0

Superior Low-Cycle Fatigue Properties of CoCrNi Compared to CoCrFeMnNi CoCrNi的低周疲劳性能优于CoCrFeMnNi

ChemRN: Metals & Alloys (Topic) Pub Date : 2020-11-20 DOI: 10.2139/ssrn.3734064

K. Lu, A. Chauhan, M. Walter, A. S. Tirunilai, Mike Schneider, G. Laplanche, J. Freudenberger, A. Kauffmann, M. Heilmaier, J. Aktaa

引用次数: 57

Significant Reduction of Phase-Transition Hysteresis for Magnetocaloric (La 1-xCe x) 2Fe 11Si 2H y Alloys by Microstructural Manipulation 显微组织处理显著降低磁热(La 1- xcex) 2Fe 11Si 2H y合金相变迟滞

ChemRN: Metals & Alloys (Topic) Pub Date : 2020-11-20 DOI: 10.2139/ssrn.3734069

Yanfeng Liu, Xiao-qian Fu, Qian Yu, Jian Liu

{"title":"Significant Reduction of Phase-Transition Hysteresis for Magnetocaloric (La 1-xCe x) 2Fe 11Si 2H y Alloys by Microstructural Manipulation","authors":"Yanfeng Liu, Xiao-qian Fu, Qian Yu, Jian Liu","doi":"10.2139/ssrn.3734069","DOIUrl":"https://doi.org/10.2139/ssrn.3734069","url":null,"abstract":"First-order magnetostructural phase transitions are inevitably accompanied by large hysteresis, which evokes non-ignorable energy losses a main challenge for the utilization of giant magnetocaloric effect (MCE) materials in the emerging magnetic cooling technology. In this work, we present a novel approach to reduce the hysteresis and simultaneously to remain the giant entropy change for La-Fe-Si-based MCE alloys by microstructural manipulation. The microstructure evolution is comprehensively studied by high angle annular dark field-scanning transmission electron microscope (HAADF-STEM), three-dimensional atom probe (3DAP) and geometric phase analysis (GAP). For the LaFe13-xSix system via co-doping of Ce and H atoms, we have observed the appearance of nano-sized grains (5 ~ 50 nm) that is totally different from the conventional compositions. Such refinement can be ascribed to the release of internal stresses caused by the inhomogeneous distribution of hydrogen atoms. With the increase of Ce content for (La1-xCex)2Fe11Si2Hy alloys, the value of hysteresis losses can be significantly reduced from 48.3 to 0.6 J kg-1. More importantly, the magnetostructural transition keeps the obvious first-order type, which leads to a large adiabatic temperature change of 2.2 K in 1.3 T upon 105 magnetic cycles, as well as a high refrigeration capacity of 89.4 J kg-1.","PeriodicalId":159806,"journal":{"name":"ChemRN: Metals & Alloys (Topic)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133722885","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: 1

Synergistic Alloy Design Concept for New High-Strength Al-Mg-Si Thick Plate Alloys 新型高强度铝镁硅厚板合金的协同合金设计理念

ChemRN: Metals & Alloys (Topic) Pub Date : 2020-11-09 DOI: 10.2139/ssrn.3726303

F. Schmid, I. Weißensteiner, M. Tunes, T. Kremmer, T. Ebner, Roland Morak, P. Uggowitzer, S. Pogatscher

{"title":"Synergistic Alloy Design Concept for New High-Strength Al-Mg-Si Thick Plate Alloys","authors":"F. Schmid, I. Weißensteiner, M. Tunes, T. Kremmer, T. Ebner, Roland Morak, P. Uggowitzer, S. Pogatscher","doi":"10.2139/ssrn.3726303","DOIUrl":"https://doi.org/10.2139/ssrn.3726303","url":null,"abstract":"With the aim of fully exploiting the advantageous strength-to-weight ratio evident in Al-Mg-Si alloys, this study presents measures for increasing the yield strength of an EN AW-6082 type plate alloy. In addition to describing the thermodynamic simulation-based adjustment of age-hardenable elements (Si, Mg and Cu) and a modified artificial ageing treatment, it investigates the effects of adding a small amount of Zr. The significant strengthening induced by adding Zr is correlated with sub-grain boundary hardening in a recovered microstructure after solution annealing at 570°C, compared with the almost entirely recrystallized microstructure in an unmodified EN AW-6082 alloy. In combination with a maximum dissolvable number of age-hardenable elements and interrupted quenching, which comprises an improved heat treatment strategy for thick plates, it is seen that the yield strength can be increased by more than 40% to 411 MPa compared to conventional EN AW-6082 base material as verified by tensile testing. In the study scanning electron microscopy and scanning transmission electron microscopy were performed for microstructural characterization with a focus on particle and deformation analysis. All individual contributions which generated the superior strength are calculated and discussed in order to reveal the microstructure-property relationship.","PeriodicalId":159806,"journal":{"name":"ChemRN: Metals & Alloys (Topic)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116088643","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

Microstructure and Strengthening Mechanisms in an Fcc-Structured Single-Phase TiC-CoCrFeCuNiAl 0.3 HEACs with Deformation Twinning fcc结构变形孪晶单相TiC-CoCrFeCuNiAl 0.3 HEACs的显微组织及强化机制

ChemRN: Metals & Alloys (Topic) Pub Date : 2020-10-26 DOI: 10.2139/ssrn.3718816

Shao-feng Yang, J. Wen, M. Han, Jingyi Xie, Xiangqian Liu

引用次数: 0

Signatures of the Effects of Defects on the Bulk Moduli of Crystalline Solids 缺陷对结晶固体体积模量影响的特征

ChemRN: Metals & Alloys (Topic) Pub Date : 2020-10-05 DOI: 10.2139/ssrn.3688767

R. Hoagland, S. Fensin

{"title":"Signatures of the Effects of Defects on the Bulk Moduli of Crystalline Solids","authors":"R. Hoagland, S. Fensin","doi":"10.2139/ssrn.3688767","DOIUrl":"https://doi.org/10.2139/ssrn.3688767","url":null,"abstract":"The small atomic region containing a defect in a crystalline solid is nonlinear elastic. In this paper, we consider a solid containing defects as a composite wherein the defected regions have a bulk modulus, K, different from that of the perfect crystal. If the volume fraction of the defected regions is sufficiently small, Vegards Law should apply so that K of the composite depends linearly on the volume fraction. We identify the slope of that linear dependence as the signature, denoted S. Atomistic models of EAM Ni were used to compute K versus reciprocal volume for several kinds of defects, namely single, di-, and tri-vacancies and interstitials, dislocations, and grain boundaries. The results show 1) when the volume fraction of the defected region is small, Vegards Law does apply, and 2) S has a distinct value for each defect and is negative for vacancies but positive for the other defects. Thus, S depends on the effective modulus of the nonlinear region and its size. A spherical ball-in-hole composite model predicts that the variation of K with volume fraction is very nearly linear. The signs and magnitudes of S, although quite small, are discussed as a potential means of monitoring defect changes in the concentration via sensitive experimental measurements of the bulk modulus.","PeriodicalId":159806,"journal":{"name":"ChemRN: Metals & Alloys (Topic)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122517634","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: 2

Evaluation of Pitting Corrosion in Duplex Stainless Steel Fe20Cr9ni for Nuclear Power Application 核电用Fe20Cr9ni双相不锈钢点蚀性能评价

ChemRN: Metals & Alloys (Topic) Pub Date : 2020-07-22 DOI: 10.2139/ssrn.3558253

Yuefeng Chen, Bin Yang, Yang-tao Zhou, Yuan Wu, Huihui Zhu

{"title":"Evaluation of Pitting Corrosion in Duplex Stainless Steel Fe20Cr9ni for Nuclear Power Application","authors":"Yuefeng Chen, Bin Yang, Yang-tao Zhou, Yuan Wu, Huihui Zhu","doi":"10.2139/ssrn.3558253","DOIUrl":"https://doi.org/10.2139/ssrn.3558253","url":null,"abstract":"Abstract A spinodal decomposition is often carried out in the austenite-ferrite duplex stainless steel Fe20Cr9Ni during long-term service at a temperature in the range from 280 to 320°C, resulting in a decrease of pitting corrosion resistance. Fe-rich α phase rather than G-phase has been suggested as the major reason for the deterioration in pitting corrosion resistance of the thermally-aged steel. Here, we found that ∼76.8% of the decline in pitting resistance for the duplex stainless steel Fe20Cr9Ni was attributed to G-phase, and ∼23.2% to Fe-rich α phase after the spinodal decomposition. In this study, a suitable thermal aging treatment was introduced to obtain a larger size of the G-phase and to study the role of the phase in the corrosion process. Through immersing thermally-aged TEM specimen treated at 475°C for 3000 h in NaCl solution, the preferential position of corrosion pits formed in the ferrite was obtained. The composition changes and strain field distribution around the G-phase were analyzed by TEM-EDS, 3DAPT and GPA techniques. We further found that, although the concentration difference of Cr element between α and α’ phases was as high as 60 at.%, corrosion pits were initiated at the interface between the G-phase and the ferrite matrix rather than in the Fe-rich α phase, indicating that the Cr-depleted theory could not explain the aforesaid phenomenon. The strain energy at the interface between the G-phase and the ferrite matrix was found to be the largest. The atoms at the interface have higher energy than in the intracrystalline, and thus easily react with Cl− ions in the solution to form pits finally.","PeriodicalId":159806,"journal":{"name":"ChemRN: Metals & Alloys (Topic)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127257940","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: 47

Fast and High-Throughput Synthesis of Medium- and High-Entropy Alloys Using Radio Frequency Inductively Coupled Plasma 利用射频电感耦合等离子体快速高通量合成中高熵合金

ChemRN: Metals & Alloys (Topic) Pub Date : 2020-07-21 DOI: 10.2139/ssrn.3649261

Bo Zhu, S. Alavi, Changjun Cheng, Haokun Sun, Hongwei Zhao, J. Mostaghimi, Y. Zou

引用次数: 0

Features of the Phase and Structural Transformations in the Processing of Industrial Waste From the Production of High-Alloyed Steels 高合金钢生产中工业废渣处理的相与结构变化特征

ChemRN: Metals & Alloys (Topic) Pub Date : 2020-06-30 DOI: 10.15587/1729-4061.2020.205779

V. Borysov, Andrii Lytvynov, N. Braginets, A. Petryshchev, S. Artemev, B. Tsymbal, A. Poliakov, V. Bratishko, V. Kuzmenko, O. Kholodiuk

{"title":"Features of the Phase and Structural Transformations in the Processing of Industrial Waste From the Production of High-Alloyed Steels","authors":"V. Borysov, Andrii Lytvynov, N. Braginets, A. Petryshchev, S. Artemev, B. Tsymbal, A. Poliakov, V. Bratishko, V. Kuzmenko, O. Kholodiuk","doi":"10.15587/1729-4061.2020.205779","DOIUrl":"https://doi.org/10.15587/1729-4061.2020.205779","url":null,"abstract":"We have investigated the physical and chemical properties of the alloy obtained by reduction smelting using wastes from the production of highly-alloyed steels and alloys. This is necessary to determine the technological aspects that reduce the loss of doping components when obtaining and using a doping alloy. The study results indicate that at the charge's oxygen-to-carbon ratio of 2.25, the alloy consisted mainly of a solid solution of doping elements in γ-Fe. At the charge's oxygen-to-carbon ratio of 1.67, we also observed Fe 3 C, followed by an increase in the intensity of carbide manifestation at the oxygen-to-carbon ratio of 1.19. Photographs of the microstructure clearly showed several phases with a different ratio of doping elements. The Ni content in the examined sections of various phases changed within 1.38‒46.38 % by weight, Cr ‒ 3.45‒45.32 % by weight, W ‒ 1.51‒27.32 % by weight, Mo ‒ 0.48‒10.38 % by weight. Mo, W, Nb mostly concentrated in individual particles. The Nb content in some inclusions reached 47.62 % by weight. Analysis of the study results has shown that the most beneficial charge's oxygen-to-carbon ratio is 1.67. At the same time, the phase composition is dominated by a solid solution of doping elements in γ-Fe. The proportion of residual carbon, which was in the form of a carbide component, accepted values in the range of 0.52‒2.32 % by weight while providing the necessary reducing capacity when using the alloy. Our research has identified new technological aspects in the processing of highly-alloyed anthropogenic waste when obtaining an alloy with a relatively low residual carbon content. The resulting parameters of the resource-saving doping material ensure the possibility to replace some of the standard ferroalloys when smelting steels with certain carbon content restrictions.","PeriodicalId":159806,"journal":{"name":"ChemRN: Metals & Alloys (Topic)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129530847","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: 4

Designing the Structures of Discrete Solidalloy Elements for Broaching the Holes of Significant Diameter Based on the Assessment of Their Strength 基于强度评估的离散固体合金元件拉削大直径孔结构设计

ChemRN: Metals & Alloys (Topic) Pub Date : 2020-06-19 DOI: 10.15587/1729-4061.2020.203524

Yakiv Nemyrovskyi, I. Shepelenko, E. Posviatenko, Yu. A. Tsekhanov, S. Polotnyak, S. Sardak, V. Bandura, Yurii Paladiichuk

{"title":"Designing the Structures of Discrete Solidalloy Elements for Broaching the Holes of Significant Diameter Based on the Assessment of Their Strength","authors":"Yakiv Nemyrovskyi, I. Shepelenko, E. Posviatenko, Yu. A. Tsekhanov, S. Polotnyak, S. Sardak, V. Bandura, Yurii Paladiichuk","doi":"10.15587/1729-4061.2020.203524","DOIUrl":"https://doi.org/10.15587/1729-4061.2020.203524","url":null,"abstract":"This paper addresses the issues related to designing and estimating the strength of solid-alloy elements in the deforming broaches of significant diameter (exceeding 150 mm) for the developed process of discrete broaching. The tool limit condition was assessed based on two strength criteria: the specific potential energy of shape change and the maximum tangent stresses. Numerical modeling using the finite element method has made it possible to derive the distribution of equivalent stresses in the tool elements and the contact stresses at the surface of the contact between a solid-alloy insert and the body, which enabled the analysis of tool strength under loading. The simulation was performed under a single normal load, which ensured the versatility of the calculation for any contact pressure values. We have derived formulae to calculate the acceptable contact pressure depending on unit load. The effect of the insert protrusion height over the body on the strength of tool elements has been established. We have derived engineering dependences that determine the required magnitude of insert protrusion over the body depending on the ultimate load. An example of calculating the strength of a prefabricated deforming element in the machining of a sleeve made from gray modified cast iron of hardness HB230 has been considered. Our calculations have shown that the deforming element designed for the new technological process corresponds to the conditions of strength, provided the ratio h 1 /h=0.15 is maintained (where h 1 is the insert height above the body, h is the insert height). The results obtained could be used in engineering calculations when designing the prefabricated tool for discrete deformation, as well as to assess the strength of prefabricated tools, such as cutters, core drills, reamers, when refining external loads","PeriodicalId":159806,"journal":{"name":"ChemRN: Metals & Alloys (Topic)","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124569885","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: 5