摘要
对不同工艺下4Cr5Mo2VCo钢的硬度及冲击性能进行测定,并用SEM对其显微组织和断口形貌进行了分析。结果表明,在1000~1100℃淬火温度范围内,4Cr5Mo2VCo钢的硬度先升高后降低,最高达59.2 HRC;未溶碳化物数量随淬火温度上升不断减少,在1100℃时基本全部溶入基体。回火过程中4Cr5Mo2VCo钢的二次硬化峰值温度为520℃,硬度随回火温度继续升高而逐渐降低。不同温度淬火试样的冲击吸收能量随回火温度的上升呈先增大后逐渐降低趋势。在44~46 HRC的硬度使用范围内,4Cr5Mo2VCo钢具有最佳强韧性配比的热处理工艺为1060℃×30 min淬火+(600~610)℃×2 h回火两次,平均冲击吸收能量可达410 J。
Hardness and impact property of 4 Cr5 Mo2 VCo steel treated by different processes were measured,and the microstructure and fracture morphology were analyzed by SEM.The results show that in the quenching temperature range of 1000-1100℃,the hardness of the 4 Cr5 Mo2 VCo steel first increases and then decreases,up to 59.2 HRC.The number of undissolved carbides decreases with the increase of quenching temperature,and almost all of the carbides dissolve into the matrix at 1100℃.During tempering,the secondary hardening peak temperature of the 4 Cr5 Mo2 VCo steel is 520℃,and the hardness decreases subsequently with the increase of tempering temperature.The impact absorbed energy of the specimens quenched at different temperatures increases firstly and then decreases gradually with the increase of tempering temperature.In the hardness ranger of 44-46 HRC,the optimum heat treatment process of the 4 Cr5 Mo2 VCo steel is quenching at 1060℃for 30 min and tempering twice at 600-610℃for 2 h,under which,the average impact absorbed energy can reach 410 J.
作者
李立
曾艳
吴晓春
Li Li;Zeng Yan;Wu Xiaochun(State Key Laboratory of Advanced Special Steel,School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;Shanghai Key Laboratory of Advanced Ferro-Metallurgy,Shanghai 200444,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2022年第4期133-140,共8页
Heat Treatment of Metals
基金
国家重点研发计划(2016YFB030402)。
