球化退火等温时间对高碳H13钢组织和性能的影响

Effect of isothermal time in spheroidizing annealing on microstructure and properties of high carbon H13 steel

采用不同的等温时间对高碳H13钢进行球化退火处理,并进行后续的淬火+回火处理,通过扫描电镜观察、硬度测试、冲击性能测试等方法,研究了等温时间对高碳H13钢组织和性能的影响。结果表明,随着等温时间的延长,淬回火处理后的高碳H13钢硬度先升高后降低,冲击性能先降低后升高,耐磨性先升高后降低。等温时间为2 h时,淬回火处理后高碳H13钢的晶界处分布较多条状和粒状碳化物,使其冲击性能下降。等温时间为3 h时,淬回火处理后高碳H13钢的晶粒内分布较多较大尺寸的粒状碳化物,使其耐磨性显著提高。等温时间为3 h时,高碳H13钢具有良好的综合性能。

High carbon H13 steel was spheroidizing annealed with different isothermal time and then quenched and tempered.The effect of isothermal time on microstructure and properties of the high carbon H13 steel was studied by means of scanning electron microscope,hardness test and impact property test.The results show that with the increase of isothermal time,the hardness of the high carbon H13 steel after quenching and tempering increases first and then decreases,the impact property decreases first and then increases,but the wear resistance increases first and then decreases.When the isothermal time is 2 h,there are more strip and granular carbides at grain boundary of the high carbon H13 steel after quenching and tempering,which reduces its impact property.When the isothermal time is 3 h,there are more granular carbides with larger size inside the grains of high carbon H13 steel after quenching and tempering,which improves its wear resistance significantly,and offers good comprehensive properties.