Effect of Cr-Rich Phase Precipitation on Magnetic and Mechanical Properties of Fe-20% Cr Alloy
Effect of Cr-Rich Phase Precipitation on Magnetic and Mechanical Properties of Fe-20% Cr Alloy
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DOI：
10.1109/tmag.2011.2155047
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发表时间：
2011-09
影响因子：
2.1
通讯作者：
J. Mohapatra;Y. Kamada;H. Kikuchi;S. Kobayashi;J. Echigoya;D. Park;Y. Cheong
中科院分区：
文献类型：
--
作者：
J. Mohapatra;Y. Kamada;H. Kikuchi;S. Kobayashi;J. Echigoya;D. Park;Y. Cheong
在等温时效Fe-20 wt. % Cr合金。与现有的原子探针数据在类似的热处理条件下的结果进行了比较。随着时效时间的延长，合金的矫顽力和硬度增加，剩磁降低。这种磁硬度和机械硬度的提高是由于富Cr α'相的形核和长大所致。原子探针分析表明，随着时效时间的延长，富Cr α'相析出物的尺寸增大，数量密度降低。在这项工作中，硬度（Hv）和结晶度（Hc）之间的良好的相关性被发现与沉淀物尺寸（r）和数密度（n）的综合效应。发现合金的结晶度和硬度的变化呈线性关系，表明MHL技术将是一个很好的非破坏性评价（NDE）工具，用于评价由Fe-Cr合金制成的结构部件的热脆化。
Magnetic Hysteresis Loop (MHL) and micro-Vickers hardness measurements were carried out in isothermal aged Fe-20 wt. % Cr alloy. The results were compared with the existing atom probe data at similar heat treated conditions. Coercivity and hardness of the alloy was increased and remanence of the alloy was decreased with the increase in ageing time. Such increase in the magnetic and mechanical hardness was due to the nucleation and growth of Cr rich α' phase. The size of the Cr rich α' phase precipitates were increased and the number density of the precipitates were decreased with the increase in ageing time observed by atom probe analysis. In this work a good correlation between hardness (Hv) and coercivity (Hc) was found with the combined effect of precipitate size (r) and number density (n). A linear relationship was found with the change in coercivity and hardness of the alloy indicating that the MHL technique would be a good Non-Destructive Evaluation (NDE) tool for the evaluation of thermal embrittlement in structural components made of Fe-Cr alloys.