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在盐溶液中 ,利用激光对 2 0 # 钢表面进行渗碳、渗硅和相变硬化相结合 ,实现了在对低碳钢表面化学渗碳、渗硅的同时 ,完成激光表面淬火处理。研究表明 ,2 0 # 钢在盐溶液中激光渗碳、渗硅后 ,可将材料表面的碳、硅含量增加 2倍 ;渗层具有一定厚度 ,主要由马氏体和贝氏体组成 ,试样表面的硬度提高到原试样的 2 5～ 3倍 ,耐磨性可达到处理前的 4～ 7 5倍。在浓度为 10 %的H2 SO4溶液中 ,静态腐蚀 2 4 0h后的实验表明 ,2 0 # 钢在经过激光渗硅化学热处理后 ,抗腐蚀能力可提高 4 0 %左右。
In salt solution, the surface of 20 # steel is carburized, infiltrated and phase-hardened by laser, which realizes laser surface quenching while carburizing and siliconizing on the surface of mild steel. The results show that after 20 # steel laser carburizing and siliconizing in salt solution, the content of carbon and silicon on the surface of the material can be increased by 2 times. The diffusion layer has a certain thickness and is mainly composed of martensite and bainite. The hardness of the sample surface is increased to 25 to 3 times that of the original sample, and the abrasion resistance can reach 4 to 7 5 times before the treatment. In the 10% H2 SO4 solution, the experiment after static etching for 240 h showed that the corrosion resistance of 20 # steel increased 40% after laser heat treatment.