碳钢及合金钢搭接激光淬火回火软化特征

• 作 者: 姚成武 黄坚 张培磊 吴毅雄 徐滨士
• 机 构: 上海交通大学材料科学与工程学院,上海市激光制造与材料改性重点实验室(上海交通大学),装甲兵工程学院装备再制造技术国防科技重点实验室,
• 出 处: 材料热处理学报
• 发表日期: 2009年05期
• 关键词: 激光淬火 回火马氏体 搭接区 软化区 回火软化 淬火回火 碳化物 扩散激活能 索氏体 马氏体

进行了459、Cr2Mo和W18Cr4V钢多道搭接激光淬火实验,结果表明,激光淬火表面都存在搭接区的回火软化现象,45钢软化区宽度最大,W18Cr4V钢软化区宽度最窄。在搭接回火区,45钢组织主要为回火索氏体和和少量回火马氏体,9Cr2Mo钢的主要为回火马氏体、索氏体和少量碳化物,而W18Cr4V的组织由针状马氏体和少量的粒状碳化物构成。根据马氏体回火过程中的碳原子扩散特征,分析和计算了碳扩散激活能和回火时间对马氏体组织的影响。

The laser lapping experiments of 459, Cr2Mo and W18Cr4V steel were carried out. The results show that there are temper softening phenomena in the lapped area on the laser quenched surface. The width of 45 steel softening zone is the largest and the softening zone of W18Cr4V steel is the narrowest. In the lap tempering zone, 45 steel mainly tempered sorbite and a small amount of tempered martensite, 9Cr2Mo steel mainly tempered martensite, sorbite and a small amount of carbide, and W18Cr4V organization by Acicular martensite and a small amount of granular carbide composition. According to the characteristics of carbon atom diffusion during martensite tempering, the effects of carbon diffusion activation energy and tempering time on martensite structure were analyzed and calculated.