固溶温度对Cr-Co-Mo-Ni轴承钢低温韧性的影响  

Influence of solid solution temperature on low temperature toughness of Cr-Co-Mo-Ni bearing steel

作　　者：王博[1,2] 杨卯生[2] 赵昆渝[1] 袁晓虹[1,2] 

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]钢铁研究总院特钢所,北京100081

出　　处：《钢铁研究学报》2015年第11期66-72,共7页Journal of Iron and Steel Research

基　　金：国家"863"计划资助项目(2012AA03A503)

摘　　要：通过对韧-脆转变温度及冲击断口的韧-脆断裂转变趋势的分析,研究了Cr-Co-Mo-Ni轴承钢经不同温度固溶热处理后的韧-脆转变温度及其影响因素。结果表明:在1 000、1 030和1 060℃固溶,其韧-脆转变温度为100℃以上,在1 090℃固溶,韧-脆转变温度为70℃,且在-50℃钢的冲击功能保持在47J以上,1 120℃固溶,韧-脆转变温度为52℃,且-50℃的冲击功为46J以上。随固溶温度的增加,原始晶粒增大,韧-脆转变温度却降低,这是晶界处大颗粒M6C碳化物导致。The ductile-brittle transition temperature and its influencing factors of Cr -Co- Mo Ni bearing steel after solid solution heat treatments at different temperatures were investigated through analysis on ductile brittle transition temperature and the trend of ductile-brittle transition of impact fracture. Results show that the ductile brittle transition temperatures of the samples after solid solutions at 1000, 1 030 and 1 060 ℃ are above 100 ℃. After sol id solution at 1 090 ℃, the ductile-brittle transition temperature is 70 ℃ and the impact energy is above 47 J at --50 ℃. After solid solution at 1 120 ℃, the ductile-brittle transition temperature is 52 ℃and the impact energy is above 46 J at -50 ℃. Ductile brittle transition temperature reduces and original grain size increases with the increasing of solid solution temperature because of big precipitations of M6 C at grain boundary.

关 键 词：轴承钢 韧-脆转变温度 固溶温度 晶粒度 碳化物 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG161[金属学及工艺—金属材料]