摘要
马氏体热强钢1Cr20Co6Ni2WMoV用真空感应炉冶炼,锭重22·5kg并锻成Φ16mm棒材。试样经1060℃1h油冷淬火,-70℃或-192℃2h空冷的冷处理,640℃3h空冷回火处理。试验结果表明,1Cr20Co6Ni2WMoV钢在热处理后的组织由高密度位错的回火板条马氏体、残余奥氏体、δ-铁素体和M23C6组成。随冷处理温度由-70℃降至-192℃,晶界上M23C6析出数量增多,晶内位错密度升高,残余奥氏体含量降低,钢的抗拉强度和屈服强度分别由1045MPa和715MPa提高至1090MPa和760MPa。
Martensite heat resistant steel 1Cr20Co6Ni2WMoV was melted by a vacuum induction furnace with 22.5 kg ingot and forged to Φ16 mm bar. Heat treatment process of samples were quenching at 1 060 ℃ for 1h oil cooling ＋ cold treatment at - 70 ℃ or - 192 ℃ for 2 h air cooling ＋ tempering at 640 ℃ for 3 h air cooling. Test results showed that with both heat treatment process the structure of steel 1Cr20Co6Ni2WMoV consisted of high density dislocation tempering lath martensite, residual austenite, δ- ferrite and M23C6. With cold treatment temperature decreased from -70 ℃ to - 192 ℃ the amount of M23C6 precipitated at grain boundary and the dislocation density in grain inside increased, the amount of residual austenite decreased and the tensile and yield strength of steel respectively increased from 1 045 MPa and 715 MPa to 1 090 Mpa and 760 MPa.
出处
《特殊钢》
北大核心
2007年第1期35-37,共3页
Special Steel
