激光处理共晶型硼化物显微组织与相变过程分析

Analysis of Transformation Course on Mechanism of Boronized Layer Being Eutecticumed with Laser as well as Observations on Its Microstructure

本文采用固体渗硼+激光表面处理的复合热处理工艺,使表层得到共晶型硼化物以期降低渗硼层脆性,提高其耐磨性。利用三维热传导偏微分方程验证了工艺参数的合理性。借助扫描电镜和光镜对试样表层、显微组织进行观察,着重分析了渗硼层在激光作用下的行为和相变过程。

The process of solid boronizing and laser surface treatment is applied to getting boron eutectic layer for purpose of lowering samples'crisp property; The microstructure is observed by using SEM, optics microscope, Fe - B-C equilibrium diagram, the mechanism of boron eutectic and behavior of layer is discussed in the course of laser treatment. In virtue of three-dimension thermal-conducting partial differential equations, it proves that the parameters of treatment are reasonable. With solid boronized and laser surface treatment on 45 steel, the layer with appropriate tenacity and hardness can be obtained.