摘要
研究了盾构刀具用5Cr5MoSiV1钢不同加热温度回火和保温时间对其显微组织和力学性能的影响。结果表明:试验钢在500～650℃回火1.5 h时,随着加热温度的升高,组织由板条状回火马氏体+残留奥氏体转变成等轴状回火索氏体+粒状碳化物,在550～600℃保温时出现二次硬化效应,且硬度在600℃左右时达到峰值,试验钢的冲击韧性随回火温度的升高而不断增强;600℃回火保温1～2.5 h时,马氏体随保温时间延长而不断分解,最终转变为保持马氏体位向的回火索氏体,试验钢的回火硬度随保温时间的延长而降低。为了使试验钢在回火后获得较好的强韧性配合,较佳的回火工艺为600℃×2 h。
The effects of tempering temperature and soaking time on microstructure and mechanical properties of 5Cr5MoSiV1 steel for shield tools were investigated.The results show that when tested steel is tempered at 500-650 ℃ for 1.5 h,the tempered microstructure transformed into equiaxed tempered sorbite and granular carbides by lath tempered martensite and residual austenite with increasing of heating temperature,secondary hardening appeared when tested steel is tempered at 550-600 ℃,and hardness reached the peak at 600 ℃,impact toughness increased with increasing of tempering temperature.When tested steel is tempered at 600 ℃ for 1-2.5 h,martensite decomposed with the prolongation of time,and transformed into tempered sorbite keeping exposure of the martensite.Hardness of tested steel decreased linearly with prolongation of soaking time.The optimum tempering process is 600 ℃×2 h in order to obtain the optimum combination of strength and toughness of 5Cr5MoSiV1 steel.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2013年第S1期50-55,共6页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金资助项目(51165032)
江西省高等学校科技创新团队资助项目(00008713)
