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首页> 外文学位 >Microstructure and mechanical behavior of Fe30Ni 20Mn35Al15 and modified Fe30Ni 20Mn35Al15 alloys.
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Microstructure and mechanical behavior of Fe30Ni 20Mn35Al15 and modified Fe30Ni 20Mn35Al15 alloys.

机译：Fe30Ni 20Mn35Al15和改性Fe30Ni 20Mn35Al15合金的组织和力学性能。

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摘要

A novel alloy with nominal composition Fe30Ni 20Mn35Al15 has been found to show good room-temperature strength and significant ductility. The current project is to study the wear properties of as-cast Fe30Ni20Mn35Al 15 and discuss the possibility of further improving the mechanical properties of this alloy. The dry sliding wear of as-cast Fe30Ni20Mn 35Al15 was studied in in four different environments, i.e. air, dry oxygen, dry argon and a 4% hydrogen/nitrogen mixture. Two-body and three-body abrasive wear mechanism was found for tests in oxygen-containing environments, while plastic flow mechanisms dominated the wear behavior for tests in argon. Hydrogen embrittlement led to 1000% increase of wear loss by causing more rapid crack nucleation of the asperities.;The effects of different additions of chromium (≤ 8 at. %) on both microstructure and fracture behavior of Fe30Ni20Mn 35Al15 were investigated. All alloys consisted of (Ni, Al)-rich B2 and (Fe, Mn)-rich f.c.c. phases with most of the Cr residing in the f.c.c. phase. The addition of 6 at. % Cr not only increased the room temperature ductility, but also completely suppressed the environmental embrittlement observed in the Cr-free alloy at low strain rates.;The effects of varying the Al concentration on the microstructures and tensile properties of six two-phase FeNiMnAl alloys with a composition close to Fe30Ni20Mn35Al15 were studied. The increase in f.c.c. volume fraction and f.c.c. lamellar width led to an increase in ductility and a decrease in yield strength. The correlation between the yield stress and f.c.c. lamellar spacing lambda obeyed a Hall-Petch-type relationship, i.e. sigmay=252+0.00027lambda-1, where the units for sigmay and lambda are MPa and meter, respectively. FeNiMnAl alloy with B2 and f.c.c. phases aligned along was reported to show high strength at room temperature. The mechanical properties of Fe 28Ni18Mn33Al21, consisting of (Ni, Al)-enriched B2 and (Fe, Mn)-enriched f.c.c. phases with an aligned microstructure, were studied both before and after various heat treatments. While the finely-microstructured as-cast Fe28Ni18Mn33Al21 was quite brittle, the alloy showed reasonable ductility of 7% if the phases were coarsened after anneal. It was shown that the aligned two-phase microstructure formed by a eutectoid transformation.
机译：已发现一种标称组成为Fe30Ni 20Mn35Al15的新型合金具有良好的室温强度和显着的延展性。当前的项目是研究铸态的Fe30Ni20Mn35Al 15的磨损性能，并讨论进一步改善该合金机械性能的可能性。在四种不同的环境中研究了铸态的Fe30Ni20Mn 35Al15的干滑动磨损，即空气，干氧，干氩和4％的氢气/氮气混合物。在含氧环境中发现了两体和三体磨料磨损机理，而在氩气中，塑性流动机理主导了磨损行为。氢脆导致粗糙的裂纹更快地成核，从而导致磨损损失增加1000％。研究了铬的添加（≤8 at。％）对Fe30Ni20Mn 35Al15的组织和断裂行为的影响。所有合金均由富（Ni，Al）的B2和富（Fe，Mn）的f.c.c.大部分Cr都存在于f.c.c.相。加上6 at。 ％Cr不仅提高了室温延展性，而且还完全抑制了低应变速率下无铬合金中观察到的环境脆化。； Al浓度变化对六种两相FeNiMnAlAl合金的组织和拉伸性能的影响研究了成分接近Fe30Ni20Mn35Al15的合金。 f.c.c.的增加体积分数和f.c.c.层状宽度导致延展性增加和屈服强度降低。屈服应力与f.c.c.层间距lambda遵循Hall-Petch型关系，即sigmay = 252 + 0.00027lambda-1，其中sigmay和lambda的单位分别为MPa和米。具有B2和f.c.c.的FeNiMnAl合金据报道，沿室温排列的相在室温下显示出高强度。 Fe 28Ni18Mn33Al21的机械性能，它由（Ni，Al）富集的B2和（Fe，Mn）富集的f.c.c.在各种热处理之前和之后都研究了具有对齐的微观结构的相。虽然细微组织化的铸态Fe28Ni18Mn33Al21相当脆，但如果退火后相变粗，则合金的合理延展性为7％。结果表明，通过共析转变形成了对齐的两相微结构。

著录项

  • 作者

    Meng, Fanling.;

  • 作者单位

    Dartmouth College.;

  • 授予单位 Dartmouth College.;
  • 学科 Engineering Materials Science.;Engineering General.;Physics Condensed Matter.
  • 学位 Ph.D.
  • 年度 2014
  • 页码 175 p.
  • 总页数 175
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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