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本文论述了铸造马氏体不锈钢(OCr13Ni4型)物理冶金领域研究进展。为使该钢获得板条马氏体基体,并弥散分布10～15％逆变奥氏体的组织,采取了特殊的热处理工艺。得到了优良的综合性能,使得这种工艺已成功地应用于长江葛州坝等电站大型机组叶片。500毫米厚叶片的心部性能,特别是叶片法兰套料性能超过了文献上迄今报导的水平。观察了低碳板条马氏体和分布于板条间的逆变奥氏体,研究了M→A逆转变过程及所产生的浮凸,确定了两相间的K—S关系。
This article discusses the research progress in the field of physical metallurgy of cast martensitic stainless steel (OCr13Ni4 type). In order to make the steel martensite matrix obtained, and the dispersion of 10 ~ 15% inverted austenite organization, to take a special heat treatment process. Has been excellent overall performance, making this technology has been successfully applied to the Gezhouba hydropower plant large unit blades. The core performance of the 500 mm thick blade, especially the blade flange stock performance, exceeds the level reported so far in the literature. The low-carbon lath martensite and the inverted austenite distributed between the laths were observed. The M → A reverse transformation process and the resultant embossments were studied, and the K-S relationship between the two phases was determined.