沉淀硬化FV520B钢的低温性能研究

腐蚀科学与防护技术, 2009, 21(3): 299-301.

沉淀硬化FV520B钢的低温性能研究

周倩青雍兴平李秀艳翟玉春

1.1东北大学材料冶金学院

沈阳110004； 2沈阳鼓风机(集团)有限公司

 3中国科学院金属研究所

1.1School of Materials and Metallurgy

Northeastern University

2Shenyang Blower Works Group Co.

3Institute of Metal Research

Chinese Academy of Sciences

Shengyang 110016

关键词：马氏体不锈钢 , tensile properties , reverse austenite , cryogenic

STUDY ON CRYOGENIC TENSILE PROPERTIES OF PRECIPITATION HARDENED FV520B STEEL

ZHOU Qian-qing

Keywords： martensitic stainless steel , 拉伸性能 , 逆变奥氏体 , 低温

通过不同热处理和低温拉伸实验、XRD和SEM等方法研究了不同时效处理后沉淀硬化马氏体不锈钢FV520B的低温力学性能.结果表明，在高温回火条件下，FV520B钢具有良好的低温拉伸性能，冷却至液氮温度时仍保持与室温下相当的塑性，这与钢中存在的逆变奥氏体有关;低温下变形时，逆变奥氏体部分地转变为马氏体，提高了钢的塑性.不同逆变奥氏体含量的钢，在拉伸过程中转变的逆变奥氏体量也不同.

The cryogenic properties of a precipitation-hardened martensitic stainless steel,FV520B,after different heat treatments were studied by using Xray diffraction,SEM and tensile testing.The results showed that the steel tempered at relatively high temperatures has pretty good low temperature tensile properties.The ductility of the steel at -196℃ remained at the same level as that at room temperature,which is due to the existence of reverse austenite.Part of the reverse austenite transformed to martensite during deformation, which improved the ductility of the steel at low temperatures.The amounts of the transformed reverse austenite during the tensile deformation were different in the steel contained different amounts of reverse austenite.

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