冷处理对超级马氏体不锈钢组织及逆变奥氏体的影响

发布时间：2019-07-06 08:51

【摘要】：为研究冷处理对超级马氏体不锈钢的组织性能及逆变奥氏体的影响,通过淬火+回火(A钢)、淬火+冷处理+回火(B钢)以及淬火+深冷处理+回火(C钢)3种工艺进行对比研究。结果表明:实验钢中基体组织为回火马氏体,随回火温度的升高,马氏体板条变细。在相同回火温度下,A钢马氏体板条尺寸较大,B钢次之,C钢尺寸较小、且更平直。实验钢中逆变奥氏体含量随回火温度的升高先增加随后降低,在650℃时达到最大,整个过程中C钢逆变奥氏体含量高于B钢和A钢。实验钢的硬度随回火温度的升高而降低,在650℃时达到最小,随后增大。相同回火温度下,C钢硬度高于B钢,B钢高于A钢。A钢中逆变奥氏体多为块状,尺寸较大,分布较少;B钢次之;C钢中逆变奥氏体多为条状,尺寸较小,且分布均匀。
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图片说明：图２不同回火温度下实验钢的硬度Ｆｉｇ．２Ｈａｒｄｎｅｓｓｅｓｏｆｔｈｅｔｅｓｔｅｄｓｔｅｅｌｓｔｅｍｐｅｒｅｄａｔ
[Abstract]:In order to study the effect of cold treatment on the microstructure and properties of super maraging stainless steel and inverter Austenite, three processes, quenching and tempering (A steel), quenching cold treatment tempering (B steel) and quenching cryogenic treatment tempering (C steel), were compared and studied. The results show that the matrix structure of the experimental steel is tempered martensite, and with the increase of tempering temperature, the martensite lath becomes finer. At the same tempering temperature, the lath size of A steel is larger, that of B steel is the second, and that of C steel is smaller and straighter. The content of inverter Austenite in experimental steel increases at first and then decreases with the increase of tempering temperature, and reaches the maximum at 650 鈩，

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