摘要
利用扫描电镜、透射电镜及俄歇能谱研究了１６Ｃｏ１４Ｎｉ１０Ｃｒ２Ｍｏ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Ｆｅ_３Ｃ和Ｍ_３Ｃ及Ｍ_２Ｃ与基体共格产生强烈静畸变有关，在５５０℃回火出现的第二类回火脆性，与Ｐ在晶界偏聚有关，断口为沿晶断裂。
The tempering process of 16Co14Ni10Cr2Mo steel has been studied by means of SEM. TEM and Auger spectroscopy. The results show that one-step temper embrittlement(OSTE) occurs at 440℃. The fracture path is qusi-cleavage. It is caused by interlath films of Fe3C and M3C carbides. Tempering at 550℃. results in a second drop in impact toughness.This tempered embrittlement is reversible. It is due to impurity (P) segregation to prior austenite grain boundaries leading to intergranular fracture.
关键词
二次硬化
高强度钢
回火
脆性
晶界偏聚
high strength secondary hardening high alloy steel, temper embrittlement,grain boundaries segregation
