离子氮化时间对DC53钢显微组织和性能的影响

Effect of Plasma Nitriding Time on Microstructure and Properties of DC53 Steel

采用金相分析、X射线衍射分析、显微硬度测量研究了离子氮化时间对DC53钢显微组织和性能的影响,得出了制备高硬度耐磨氮化层的合适离子氮化时间。结果表明:在离子氮化处理的DC53钢表层获得由ε相(Fe3N)、γ’相(Fe4N)和少量α-Fe相组成的均匀的氮化层。随离子氮化时间延长,ε相(Fe3N)的衍射峰逐渐降低,而γ’相(Fe4N)衍射峰呈逐渐升高的趋势,α-Fe相衍射峰逐渐降低。氮化层厚度的平方值随离子氮化时间的延长呈线性增加,且氮化层硬度不断升高。从表面到基体深度的增加,氮化层呈理想的硬度梯度分布,离子氮化在DC53钢表面形成的均匀氮化层使DC53钢硬度显著提高。

By microscopic examination,X-ray diffraction analysis and microhardness determination,the effects of plasma nitriding time on the microstructure and hardness of DC53 were investigated.And then,the uniform suitable ion nitriding time for the preparation of high hardness abrasion resistant nitrided layer was obtained.The results show that the uniform nitriding layer mainly composed of Fe3N and Fe4N and containing a small amount ofα-Fe phase can be prepared by ion nitriding treatment on the surface of DC53 steel.With the increase of ion nitriding time,the diffraction peak ofε-phase(Fe3N)gradually decreases,butγ’phase(Fe4N)gradually increases,theα-Fe gradually decreases.The square of the thickness of the nitride layer increases linearly with the increase of plasma nitriding time and the hardness of the nitriding layer increases gradually.With the increase of the distance from the surface to the matrix,the hardness of the nitride layer exhibits a desirable hardness gradient distribution.The uniform nitriding layer formed on the surface of DC53 steel by ion nitriding obviously improves the hardness of DC53 steel.