摘要
选用42CrMo钢为实验材料,分别进行普通离子渗氮处理、活性屏离子渗氮处理及预氧化+离子渗氮处理。利用金相显微镜观察离子渗氮层的显微组织;利用XRD分析离子渗氮层中的各种物相;在试验结果的基础上,分析不同的离子渗氮方式及不同的渗氮工艺参数对渗层组织和性能的影响。结果表明:42CrMo钢经离子渗氮处理后由表及里形成明显的白亮层和扩散层;渗层由Fe2-3N和Fe4N组成;离子渗氮后试样的表面硬度得到明显提高;在不同的离子渗氮方式下,渗氮工艺参数对化合物层厚度及扩散层厚度的影响规律存在一定的差异。活性屏对离子渗氮起到一定的促进作用,低温时尤为显著。离子渗氮前进行预氧化处理,可以加速渗氮过程的进行,其中在300℃下预氧化30 min效果最佳。
Taking 42CrMo steel as experiment material, common ion nitriding treatment, active screen plasma nitriding treatment and pre-oxidation ＋ ion nitriding treatment under different temperatures were carried out. The microstructure of ion nitriding layer was observed by metallurgical microscope, and various phases of ion nitriding layer were analyzed by XRD. Based on the results of experiment, various ways of ion nitriding and the effects of nitriding technological parameters on microstructure and property ofnitriding layer were analyzed. The results show that the striking bright layer and diffusion layer are formed from the outside to the inside of 42CrMo steel after ion nitfiding treatment, and the layers are made up of Fe2.3N and Fe4N. Surface hardness of the sample after ion nitriding is improved obviously. The effect rule of nitriding technological parameters on thickness of compound layer and diffusion layer has some differences. Active screen has a certain promoting effect on ion nitriding, especially at low temperature. Pre-oxidation before ion nitriding can accelerate nilriding, and pre-oxidation at 300 ℃ for 30min is the best.
出处
《热加工工艺》
CSCD
北大核心
2014年第8期145-149,共5页
Hot Working Technology
