一、难于克服的氮化缺陷长期生产实践说明,在装炉量(指氮化面积)特别大时,会出现在普通装炉量时所见不到的质量问题。对进行过重挤压切削加工的38CrMoAlA钢缸套零件来说,这个质量问题的表现有二: 1.一炉中半数左右的缸套,其部分表面在氮化后保留了未氮化时的金属光泽,解剖这种零件进行金相观察和硬度测试,则这些有金 First, it is difficult to overcome the defects of nitriding Long-term production practice shows that when the loading capacity (referring to the nitrogen area) is particularly large, there will be seen in the ordinary loading capacity can not see the quality problems. For over-crushing 38CrMoAlA cylinder liner parts, the quality of the performance of the two: 1. In a furnace about half of the cylinder liner, part of the surface after nitriding retains the non-nitriding Metallic luster, dissection of such parts metallographic observation and hardness testing, then these are gold