38CrMoAl钢离子渗氮与激光淬火硬化层倍增技术  

Hardening Layer Multiplication Technique of 38CrMoAl Steel after Plasma Nitriding and Laser Quenching Process

作　　者：贾晓俊[1] 卢竞[1] 李博[1] 王祎雪[1] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001

出　　处：《热处理技术与装备》2015年第5期3-8,共6页Heat Treatment Technology and Equipment

基　　金：国家自然科学基金(51371070)

摘　　要：本文对38Cr Mo Al钢离子渗氮与激光淬火硬化层倍增技术进行了研究;首先对渗氮层氮浓度分布及激光温度场进行模拟,并采用Thermo-Calc软件对Fe-C-N三相点进行了计算,从而对复合改性工艺进行设计;然后通过实验对模拟计算结果进行验证。结果表明:渗氮与激光淬火硬化层深相比于渗氮层或激光淬火层均有大幅度提升。渗氮与激光淬火硬化层倍增机制在于N元素的引入使相变温度从Fe-C二元共析点727℃降低到Fe-N-C三元共析点的577℃,因此在相同的温度分布下表层能够发生相变硬化的深度增加。The hardening layer multiplication technology of 38 Cr Mo Al steel plasma nitriding and laser quenching process is investigated in this paper. Firstly,the nitrogen distribution in the nitriding layer and the temperature field for laser quenching are simulated by Matlab and Abaqus. The triple point of Fe-C-N system is calculated by Thermo-Calc software. Accordingly,the composite modification process is designed and the results of the simulation is sverified by experiments. The experimental results show that the thickness and hardness of the duplex treated layer are greatly improved compared with the nitrided layer as well as the laser hardened layer. The mechanism involved lies in the reduction of the eutectoid point from 727℃ for the Fe-C binary system to the 577℃ for the Fe-N-C ternary system. Thus,the depth hardened due to the phase transition increases under the same temperature distribution.

关 键 词：38CRMOAL钢 离子渗氮-激光复合改性 数值模拟 组织结构 硬度 

分 类 号：TG161[金属学及工艺—热处理]