低碳钢表面合金强化层组织及性能的研究

Investigation on Microstructure and Property of Low-carbon Steel Surface Strengthened Layer

利用双层辉光离子渗金属技术,在Q235钢表面进行Mo-Cr共渗,随后进行超饱和渗碳、淬火及回火复合处理。表面合金化层厚度达100μm以上,表面Mo含量20%以上,Cr含量10%左右。超饱和渗碳表面含碳量在2.0%以上。在M-200磨损试验机上试验,摩擦因数平均为0.1,平均相对耐磨性是GCr15渗碳淬火钢的2.25倍。在箱式炉中690℃回火4 h,表面平均硬度595 HV0.025,有较好的抗高温软化能力。

Mo-Cr penetrating layer on Q235 low-carbon steel was built up by double glow plasma surface metallurgy and then the technological process of ultra-saturated carbonization, quenching and low tempering was made. The fundament is that alloying elements Mo, Cr are penetrated into the carbon steels in a vacuum chamber by glow discharge sputtering. The surface to be tested is under the following conditions： the depth of coating is over 100 μm and the contents of Mo, Cr in a alloyed surface layer of low-carbon steal are respectively about 20 % and 10 % and surface carbon content is 2.0 % above after ultra-saturated carbonization. The abrasion experimental results show that the average friction coefficient is 0.1 and the average relative wearability is 2.25 times as much as one of GCr15. The alloy layer possesses a very strong ability against temper softening, its surface hardness still exceeds 595 HV0.025 after tempering for 4 h at 690℃. Resistance to tempering of the alloy layer is similar to metallurgical HSS.