45钢激光相变强化梯度组织的研究(原始组织的影响)  

The Study of the Gradient Structure of 45 Steel by Laser Transformation Hardening(The Influence of original microstructure)

作　　者：张光钧[1] 邢琪[1] 吴晓晖[1] 

机构地区：[1]上海工程技术大学,上海200036

出　　处：《应用激光》2004年第1期13-18,共6页Applied Laser

基　　金：上海市科技发展基金项目 (0 111110 5 7)

摘　　要：通过试验 ,分析研究了 4 5钢激光相变强化梯度分布的显微组织特征以及原始组织对 4 5钢激光相变强化梯度组织及其显微硬度的影响。通过对不同原始组织激光相变强化效果的对比分析 ,指出原始组织越细小弥散 ,成分越均匀 ,缺陷密度越高 ,材料的临界硬化温度越低 ,越有利于激光相变强化。在相同的激光处理工艺参数下 ,原始组织为淬火高温回火态时 ,激光相变强化的效果最显著 ,正火态次之。This paper mainly studied the gradient microstructure of 45 steel by laser transformation hardening (LTH) and the influence of different original microstructure on the gradient microstructure and its microhardness. By analyzing the hardening effect of different original microstructure, it is known that if the original microstructure is more dispersive, more uniform and containing more dense of dislocation, the rate of LTH is faster. And the critical hardening temperature is lower. Among the five original microstructure, the effect of strengthening of hardening and tempering is the best, then the normalizing. The LTH hardness and the depth of the quenching and tempering is higher than the annealing.

关 键 词：激光相变强化 45钢 梯度组织 原始组织 显微组织 

分 类 号：TG115.21[金属学及工艺—物理冶金]