磷在钢回火脆性发展时的非平衡偏聚及钼的影响  

Investigation on Non Equilibrium Segregation of P and Influence of Mo for Steel Having Temper Embrittlement

作　　者：张灶利[1] 刘键[2] 林清英[3] 余宗森[1] 刘登科 

机构地区：[1]北京科技大学材料物理系,北京100083 [2]中国科学院高能物理研究所,北京100080 [3]钢铁研究总院分析测试研究所,北京100081 [4]北京东凯永磁材料厂,北京100024

出　　处：《钢铁研究学报》1999年第5期26-29,共4页Journal of Iron and Steel Research

摘　　要：用俄歇能谱仪和扫描电镜研究了中碳钢和含钼中碳钢在回火脆性发展过程中Ｐ在晶界上的偏聚。发现在４８０ ℃回火时，两种钢均在晶界出现Ｐ的浓度峰值。含钼中碳钢中的Ｍｏ 减小了晶界断裂比例，但并不改变Ｐ的浓度峰值。同时还观察了Ｓ、Ｃ、Ｍｏ 等组元在晶界的偏聚。Ｐ在晶界的浓度峰值可以用磷－空位复合体的非平衡偏聚机制加以解释。Grain boundary (G.B.) segregation of P in medium carbon steel and medium carbon steel containing Mo during tempering was investigated by AES and SEM. The results show that a concentration peak of P segregation at G.B. arises during tempering at 480 ℃ in both steels. For steels containing Mo the role of Mo is to lessen the proportion of intergranular fracture but not influencing G.B. segregation of P. Moreover, G.B. segregations of S, C, Mo were also studied. The peak character of P segregation at G.B. can be reasonably explained by the mechanism of P vacancy complex.

关 键 词：中碳钢 回火脆性 磷 非平衡偏聚 钼 

分 类 号：TG142.13[一般工业技术—材料科学与工程]