一种高强韧性高淬透性贝氏体型非调质钢  

A Non-quenched and Tempered Bainitic Steel with High Strength-Toughness and Hardenability

作　　者：彭金明[1] 罗毅[1] 汪宏斌[1] 吴晓春[1] 

机构地区：[1]上海大学材料科学与工程学院,上海200072

出　　处：《机械工程材料》2010年第8期33-35,共3页Materials For Mechanical Engineering

基　　金：先进钢铁材料技术国家工程研究中心课题(D.09-0110-07-002)

摘　　要：开发了一种高强韧性高淬透性贝氏体型非调质钢;对该钢的显微组织、力学性能和连续冷却转变(CCT)曲线进行了研究,并与42CrMo钢进行了强韧性比较。结果表明:试验钢在锻后空冷和砂冷后都得到贝氏体组织,强韧性接近;该钢具有良好的淬透性及较宽的贝氏体转变区,在低于0.05℃·s^(-1)的冷却速率下才有少量铁素体析出;在350℃回火2 h后,其力学性能超过了传统调质钢42CrMo的水平。A non-quenched and tempered bainitic steel with high strength-toughness and hardenability had been developed. The microstructure, mechanical properties and continuous cooling transformation （CCT） curves of the steel were studied, and its strength-toughness was compared with that of the 42CrMo steel. The results show that both the tested steels microstructure cooled at air and sand after forging was bainite and the strength-toughness was similar. The steel had good hardenalility and broad bainitic transformation. The ferrite did not appear as the cooling rate was lower than 0. 05℃·s^-1. The mechanical properties of the bainitic steel were better than those of traditional quenched and tempered steel 42CrMo after tempered at 350℃ for 2 h.

关 键 词：强韧性 淬透性 贝氏体 非调质钢 

分 类 号：TG142.2[一般工业技术—材料科学与工程]