稀土对SiMnCr和SiMnMo结构钢回火脆性的影响  

Effect of Rare Earths on Tempered Martensite Embrittlement of Steel

作　　者：高国忠[1] 贺维勇[1] 高炬 陈继志[1] 

机构地区：[1]中国科学院金属研究所

出　　处：《中国稀土学报》1997年第4期330-333,共4页Journal of the Chinese Society of Rare Earths

摘　　要：研究了ＳｉＭｎＣｒ钢和ＳｉＭｎＭｏ钢低温回火过程中机械性能的变化。稀土对低温回火时的材料强度没有明显的影响。ＳｉＭｎＣｒ钢和ＳｉＭｎＭｏ钢分别在３５０和４００℃存在ＴＭＥ谷底值；稀土对谷底值的温度虽然没有影响，却可以在一定程度上改善其数值。稀土改善回火脆性是细化晶粒和抑制奥氏体晶界脆化作用的结果。he mechanical properties of SiMnCr and SiMnMo steels tempered in lowtemperature range were studied. The results show that there is no obvious effect of rare earth element(RE) on material strength during lowtemperature tempering. There are the troughs of tempered martensite embrittlement(TME) at 350 and 400 ℃, respectively corresponding to SiMnCr and SiMnMo steels. RE can improve TEM troughs to some extent by refining grains and restraining embrittlement of austenite grain boundary, although it does not change TME temperature.

关 键 词：稀土 回火脆性 结构钢 硅锰铬 硅锰钼 

分 类 号：TG142.41[一般工业技术—材料科学与工程]