新型铬锰氮不锈钢的抗气蚀性能

Resistance of New Type CrMnN Stainless Steel to Cavitation Erosion

在磁致伸缩仪和转盘气蚀仪上测试了一类新型的铬锰氮不锈钢的抗气蚀性能，并用Ｍｏｓｂａｕｅｒ谱分析了气蚀前后试样表层显微组织的变化。结果表明，铬锰氮双相（Ａ－Ｍ）不锈钢具有比目前水轮机转轮及叶片常用的ＺＧ０Ｃｒ１３Ｎｉ４～６Ｍｏ和ＺＧ０Ｃｒ１６Ｎｉ５Ｍｏ钢更高的抗气蚀性能，介稳奥氏体及其在气蚀过程中的组织变化是该类铬锰氮不锈钢具有优异的抗气蚀性能的重要原因。

The resistance to cavitation erosion (CE) were measured using a magnetrostrictive device and a rotating disk device for a new type CrMnN stainless steel. The microstructural changes in the surface layer before and after CE were analysised by the use of Mossbauer spectra. The results show that the resistance to CE of duplex austenitic martensitic CrMnN stainless steels is much better than that of ZG0Cr13Ni4～6Mo and ZG0Cr16Ni5Mo steels which are in common use for hydraulic turbine runners. The metastable austenite and its changes in the process of CE are the key factor why the CrMnN stainless steels have excellent resistance to CE.