Q235钢低温渗铬及渗氮复合工艺的研究

Study on Compound Process of Plasma Chromizing and Nitriding for Q235 Steel at Low-temperature

采用双层辉光离子渗铬与随后的离子渗氮工艺相结合,在Q235钢表面分别进行渗铬+渗氮、渗氮+渗铬+渗氮以及渗氮+渗铬复合工艺处理;考察不同工艺条件下渗层的组织及性能。结果表明:前两种工艺表面均出现离子氮化白亮层(ε相);三种工艺渗层主要相组成为:铁-铬固溶体(Fe-Cr)、铁的碳化物(Fe3C)和氮化物(Fe3N)、铬氮化合物(Cr2N)及少量的铬碳化合物(Cr23C6)。在本实验条件下,渗铬+渗氮的渗层表面显微硬度最高,达到760HV,耐磨性最好,强化效果最明显。

By the combination of double glow ion chromizing and nitriding, chromizing ＋ nitriding, nitriding ＋ chromizing ＋ nitriding and nitriding＋ chromizing on the surface of Q235 steel were carried out respectively. The microstructure and properties of Q235 steel after different process treatmen were studied. The results show that there are white-nitride layers （ε phase） in the strcture after chromizing＋nitriding, nitriding＋ chromizing＋ nitriding; the three major phases are ferro-chromium solid solution（Fe-Cr）, ferro carbide（Fe3C） and ferro nitrogen（Fe3N）, chromium nitrogen compounds （Cr2N） and a small amount of carbon-chromium compounds （Cr23C6）. Under the testing conditions, the microhardness of chromizing＋nitriding layer is highest, reaching 760 HV, the wear resistance is best, the strengthening effect is the most obvious.