摘要
利用扫描电镜、透射电镜及俄歇能谱研究了１６ＮｉＣｏ钢回火行为，结果表明，该钢在４４０℃发生第一类回火脆性，断口特征为准解理。产生原因与分布在板条边界的Ｆｅ３Ｃ和Ｍ３Ｃ及与基体共格Ｍｏ２Ｃ产生强烈静畸变有关。在５５０℃回火出现具有可逆性的第二类回火脆性，与Ｐ在晶界偏聚有关，断口为沿晶断裂。
The tempering process of 16NiCo steel has been studied by means of SEM,TEM and Auger spectrocopy.The results show that one step temper embrittlement(OSTE) occurs at 440℃.The fracture path is qusi cleavage.It is caused by inter lath films of Fe 3C and M 3C carbides. Tempering at 550℃ results in a second drop in impact toughness. This tempered embrittllement is reversible. It is due to impurity (P) segregation to prior austenite grain boundaries leading to intergranular fracture.
出处
《航空材料学报》
EI
CAS
CSCD
1998年第1期32-38,共7页
Journal of Aeronautical Materials
关键词
高合金二次硬化高强度钢
回火脆性
high alloy secondary hardening high strength steel, temper embrittlement
