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利用针状铬丝在Q235钢表面进行1000℃×4 h等离子渗铬,对渗铬试样分别进行(480、520、560℃)×6 h的离子渗氮处理。对经过渗铬和离子渗氮处理的试样进行磨粒磨损耐磨性试验。结果表明,Q235钢渗铬后表面铬含量为22wt%,渗层厚度为50μm。渗铬层经渗氮处理形成了含铬氮化物(CrN、Cr2N)及少量含铬碳化物(Cr23C6)组成的表面强化层,表面显微硬度最高达1500HV0.1。磨粒磨损试验表明,与未处理Q235试样比较,渗铬并经过480、520、560℃离子渗氮处理的试样耐磨性分别提高了1.50、3.05和1.44倍;520℃离子渗氮试样较T10钢淬火+低温回火试样及3Cr13离子渗氮试样分别提高了2.20倍和2.73倍。
The surface of Q235 steel was treated with plasma chromia at 1000 ℃ for 4 h by using needle-shaped chrome wire, and ion nitriding treatment was performed on the chromized samples at (480, 520 and 560 ℃) for 6 h. Abrasive wear resistance test of the samples after the chromizing and ion nitriding treatment. The results show that the chromium content of Q235 steel after chromizing is 22wt% and the thickness of the layer is 50μm. The chromizing layer is nitrided to form a surface strengthening layer comprising chromium nitride (CrN, Cr2N) and a small amount of chromium-containing carbide (Cr23C6), and the surface microhardness is up to 1500HV0.1. Abrasive wear tests show that compared with untreated Q235 samples, the wear resistance of the samples treated with the infiltration of 480,520,560 ℃ ion nitriding is 1.50, 3.05 and 1.44 times higher than that of the untreated Q235 samples respectively. The 520 ℃ ion nitriding test Compared with T10 steel quenched + low temperature tempered samples and 3Cr13 ion nitriding samples increased by 2.20 times and 2.73 times, respectively.