Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science最新文献_第7页

Nitrogen Effects in Additively Manufactured Martensitic Stainless Steels: Conventional Thermal Processing and Comparison with Wrought. 氮对增材制造马氏体不锈钢的影响：常规热处理及与变形的比较。

IF 2.2 3区材料科学

Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science Pub Date : 2020-05-01 DOI: 10.1007/s11661-020-05703-6

Eric A Lass, Fan Zhang, Carelyn E Campbell

{"title":"Nitrogen Effects in Additively Manufactured Martensitic Stainless Steels: Conventional Thermal Processing and Comparison with Wrought.","authors":"Eric A Lass, Fan Zhang, Carelyn E Campbell","doi":"10.1007/s11661-020-05703-6","DOIUrl":"10.1007/s11661-020-05703-6","url":null,"abstract":"The microstructures of additively manufactured (AM) precipitation-hardenable stainless steels 17-4 and 15-5 were investigated and compared to those of conventionally produced materials. The residual N found in N2-atomized 17-4 powder feedstock is inherited by the additively produced material, and has dramatic effects on phase stability, microstructure, and microstructural evolution. Nitrogen is a known austenite stabilizing element, and the as-built microstructure of AM 17-4 can contain up to 90 pct or more retained austenite, compared to the nearly 100 pct martensite structure of wrought 17-4. Even after homogenization and solutionization heat treatments, AM 17-4 contains 5 to 20 pct retained austenite. In contrast, AM 15-5 and Ar-atomized AM 17-4 contain<5 pct retained austenite in the as-built condition, and this level is further decreased following post-build thermal processing. Computational thermodynamics-based calculations qualitatively describe the observed depression in the martensite start temperature and martensite stability as a function of N-content, but require further refinements to become quantitative. A significant increase in the volume fraction of fine-scale carbide precipitates attributed to the high N-content of AM 17-4 is also hypothesized to give rise to additional activation barriers for the dislocation motion required for martensite nucleation and subsequent growth. An increase in the volume fraction of carbide/nitride precipitates is observed in AM 15-5, although they do not inhibit martensite formation to the extent observed in AM 17-4.","PeriodicalId":49827,"journal":{"name":"Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science","volume":"51 5","pages":""},"PeriodicalIF":2.2,"publicationDate":"2020-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10111336/pdf/nihms-1616365.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9383831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Solidification of Ni-Re Peritectic Alloys. Ni-Re包晶合金的凝固。

IF 2.2 3区材料科学

Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science Pub Date : 2019-01-01

W J Boettinger, D E Newbury, N W M Ritchie, M E Williams, U R Kattner, E A Lass, K-W Moon, M B Katz, J H Perepezko

引用次数: 0

Simulation of TTT Curves for Additively Manufactured Inconel 625. 增材制造铬镍铁合金 625 的 TTT 曲线模拟。

IF 2.2 3区材料科学

Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science Pub Date : 2019-01-01 DOI: 10.1007/s11661-018-4959-7

G Lindwall, C E Campbell, E A Lass, F Zhang, M R Stoudt, A J Allen, L E Levine

{"title":"Simulation of TTT Curves for Additively Manufactured Inconel 625.","authors":"G Lindwall, C E Campbell, E A Lass, F Zhang, M R Stoudt, A J Allen, L E Levine","doi":"10.1007/s11661-018-4959-7","DOIUrl":"10.1007/s11661-018-4959-7","url":null,"abstract":"The ability to use common computational thermodynamic and kinetic tools to study the microstructure evolution in Inconel 625 (IN625) manufactured using the additive manufacturing (AM) technique of laser powder-bed fusion is evaluated. Solidification simulations indicate that laser melting and re-melting during printing produce highly segregated interdendritic regions. Precipitation simulations for different degrees of segregation show that the larger the segregation, i.e., the richer the interdendritic regions are in Nb and Mo, the faster the δ-phase (Ni3Nb) precipitation. This is in accordance with the accelerated d precipitation observed experimentally during post-build heat treatments of AM IN625 compared to wrought IN625. The δ-phase may be undesirable since it can lead to detrimental effects on the mechanical properties. The results are presented in the form of a TTT diagram and agreement between the simulated diagram and the experimental TTT diagram demonstrate how these computational tools can be used to guide and optimize post-build treatments of AM materials.","PeriodicalId":49827,"journal":{"name":"Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science","volume":"50 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9706688/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40712938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study of the Formation Mechanism of A-Segregation Based on Microstructural Morphology 基于微观组织形态学的a -偏析形成机理研究

IF 2.8 3区材料科学

Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science Pub Date : 2018-04-09 DOI: 10.1007/S11661-018-4609-0

Zhang Zhao, Bao Yuchong, Liu Lin, P. Song, Li Ri

引用次数: 2

The Influence of Annealing Temperature and Time on the Formation of δ-Phase in Additively-Manufactured Inconel 625. 退火温度和时间对添加铬镍铁合金625中δ相形成的影响。

IF 2.2 3区材料科学

Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science Pub Date : 2018-01-01 DOI: 10.1007/s11661-018-4643-y

M R Stoudt, E A Lass, D S Ng, M E Williams, F Zhang, C E Campbell, G Lindwall, L E Levine

{"title":"The Influence of Annealing Temperature and Time on the Formation of δ-Phase in Additively-Manufactured Inconel 625.","authors":"M R Stoudt, E A Lass, D S Ng, M E Williams, F Zhang, C E Campbell, G Lindwall, L E Levine","doi":"10.1007/s11661-018-4643-y","DOIUrl":"10.1007/s11661-018-4643-y","url":null,"abstract":"This research evaluated the kinetics of δ-phase growth in laser powder bed additively-manufactured (AM) Inconel 625 during post-build stress-relief heat treatments. The temperatures ranged between 650°C and 1050°C, and the times from 0.25 to 168 hours. The presence of δ-phase was verified for each temperature/time combination through multiple techniques. A conventional time-temperature-transformation diagram was constructed from the time-temperature data. Comparison to the growth in wrought IN625 with a similar nominal composition revealed that δ-phase formation occurred at least two orders of magnitude faster in the AM IN625. The results of this study also revealed that the segregated microstructure in the as-built condition has a strong influence on the kinetics of δ-phase formation in AM IN625 as compared to a homogenized material. Since control of the δ-phase growth is essential for reliable prediction of the performance of IN625 components in service, avoiding heat treatments that promote the formation of δ-phase in AM components that are not homogenized is highly recommended. This will be particularly true at elevated temperatures where the microstructural stability and the consistency of mechanical properties are more likely to be affected by the presence of δ-phase.","PeriodicalId":49827,"journal":{"name":"Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science","volume":"49 ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6459739/pdf/nihms-1510678.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"37151601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Formation of the Ni3Nb delta-phase in stress-relieved Inconel 625 produced via powder-bed laser fusion additive manufacturing 粉末床激光熔融增材制造去应力Inconel 625中Ni3Nb δ相的形成

IF 2.8 3区材料科学

Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science Pub Date : 2017-08-23 DOI: 10.1002/DOI:

B. Natarajan, A. Krishnamurthy, C. Emiroglu, Amanda L. Forster, E. Foster, C. Weder, D. Fox, J. Obrzut, J. Gilman

引用次数: 1

Foreword. Coatings for Structural, Biological, and Electronic Applications 前言。结构、生物和电子应用的涂料

IF 2.8 3区材料科学

Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science Pub Date : 2011-11-01 DOI: 10.1007/S11661-010-0582-Y

N. Ravindra, N. Michael, R. Narayan, C. Kim, G. Krumdick

引用次数: 0

Foreword: Structural Materials for the Americas Proceedings of the First TMS-ABM International Materials Congress Rio de Janeiro, July 26–30, 2010 前言:第一届TMS-ABM国际材料大会美洲会议论文集，里约热内卢，2010年7月26-30日

IF 2.8 3区材料科学

Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science Pub Date : 2011-10-01 DOI: 10.1007/S11661-011-0771-3

S. Monteiro, M. Meyers

引用次数: 1

Discussion of “Prediction of Shrinkage Pore Volume Fraction Using a Dimensionless Niyama Criterion” “用无量纲尼山准则预测收缩孔隙体积分数”的讨论

IF 2.8 3区材料科学

Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science Pub Date : 2009-10-17 DOI: 10.1007/S11661-009-0056-2

K. SigworthGeoffrey

引用次数: 9

Production of Ni3Ti−TiC x intermetallic-ceramic composites employing combustion synthesis reactions 燃烧合成反应制备Ni3Ti−TiC x金属间陶瓷复合材料

IF 2.8 3区材料科学

Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science Pub Date : 2006-03-01 DOI: 10.1007/S11661-006-1024-8

D. Burkes, G. Gottoli, J. J. Moore, H. Yi

引用次数: 6