【導讀】本課題主要以馬氏體時效不銹鋼中的AerMet100為研究對象，主要研究添加不同含量的稀土元素Y、不同的熱處理工藝對AerMet100鋼的組織以及力學性能的影響。在實驗過程中主要采用了掃描電鏡掃描，X射線衍射等分析方法。%~%時隨著Y含量的增加硬度呈上升趨勢，%時硬度、強度達到最高值，%~%增加時硬度、強度值逐漸下降。%時，在基體中有彌散的顆粒析出，對基體起到了強化作用，%時在晶界周圍有MC型碳化物大量析出，對基體的強度產生了不好的影響。XRD分析發(fā)現在添加Y元素的AerMet100合金中馬氏體的含量相對較高，%以下時碳化物析出以M2C為主，%時，主要以MC型碳化物為主。超高強度鋼是指屈服強度不小于1380MPa的高強度結構鋼。超低碳馬氏體時效硬化型超高強度鋼，通常稱馬氏體時效鋼。二次硬化超強鋼分為中合金和高合金二次硬化超高強度鋼，中合金超強鋼是從熱變模具鋼發(fā)展而來。高合金超強鋼是由9Ni-4Co鋼發(fā)展而來。

　　

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