奥氏体型合金一般具有优良的低温韧性.本文对奥氏体Fe-Mn合金低温变脆现象进行了研究.实验结果肯定了低温下有冷脆倾向;指出随Mn含量增多,冷脆转变温度增高,呈沿晶脆断;发现Mn沿晶界偏聚,且Mn含量愈高偏析程度愈大;初步分析了晶界Mn富集造成冷脆的因素;未能证实前人提到的可能引起低温变脆的-100℃时面心立方→面心四方相变的存在.
Low temperature embrittlement has been observed for some austen-itic Fe-Mn alloys. The transition temperature of embrittlement raises with theincrease of Mn content, and the fracture model becomes intergranular at the lowtemperatures. The segregation of Mn at grain boundaries has been detected and theextent of it directly relates to the Mn content in the alloys. It is considered thatthis is the reason of the low temperature embrittlement of the alloys. No evidencewas found to prove a fcc-fct transition occurring at about-l00℃ as mentioned byBogachev.
参考文献
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| [4] | Morris J W. Hwang S K, Yushchenku K A. Adv Cryogenic Eng, 1978 |
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