高强马氏体钢长期时效过程中的微偏聚现象

MICROSEGREGATION PHENOMENON IN HIGH STRENGTH MANTENSITE STEEL AGED OVER A LONG PERIOD OF TIME

１４％Ｃｒ－５％Ｎｉ－１％Ｍｏ马氏体钢热处理后在４００℃长期时效，强度增加，韧性降低，合金脆化．经扫描电镜、谱和俄歇电子能谱技术等分析表明，合金脆化与有害元素（如Ｐ）和合金元素Ｃｒ、Ｎｉ、Ｃ等在原始奥氏体晶界上微偏聚过程有关。

After the heating treatment,the strangth and the brittleness of 14%Cr-5%Ni-1%Momartensite steel aped at 400℃ over a long period of time are growed, while its toughness is lowered. Further theoretical analyses showed that the alloy brittleness is related to the microscgregation process of harmful clements (such as P) and alloy clements such as Cr、Ni、C et cetera atgrain boundaries of ordainal austenite by means of SEM. Mossbauer spectrum and AES technigueand so on.