时效对50Mn18Cr4WN护环钢性能的影响

Effect of Aging Behaviour of Retaining Ring Steel 50Mn18Cr4WN

研究了时效温度对国产５０Ｍｎ１８Ｃｒ４ｗＮ奥氏体钢（１８／４钢）冲击韧度和在现结构的影响，结果表明，在５２０℃～９５０℃之间时效时，Ｍ＿（２３）Ｃ＿６型碳化物在１８／４钢晶界析出，从而使用的冲击韧度下降。因此，安装护环的热套装配温度应低于５２０℃。

The effect of aging on impact toughness and microstructure of steel 18/4 is studied. It is found that the precipitation of M_(23)C_6 carbides on grain boundary leads to a degration of impact toughness of steel 18/4 when it is aged between 520℃and 950℃.It is also proposed that the shrinking temperature of retaining ring should be lower than 520℃。