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利用双层辉光等离子渗金属技术和固体渗碳法在Q235钢表面获得与冶金高速钢成分相当的等离子钨钼镝合金层,并对合金层进行不同温度的淬火和回火作为复合强化热处理,得到硬度和抗回火性都较高的合金强化层。采用场发射扫描电镜(附带能谱仪)和显微硬度计研究不同热处理工艺对等离子钨钼镝合金强化层的显微组织,硬度和抗回火性能的影响,结果表明,等离子钨钼镝合金层的最优强化热处理工艺为1050℃淬火+550℃回火,所得强化层中碳化物呈颗粒状弥散分布,且数量最多,尺寸最小(≤1μm),未经回火的表面硬度为1144HV_(0.05),在550℃回火出现二次硬化,表面硬度达到1153 HV0.05。
The plasma tungsten-molybdenum-dysprosium alloy layer is obtained on the surface of Q235 steel by using double glow plasma infiltration metal technology and solid carburizing method, and the alloy layer is quenched and tempered at different temperatures as a composite strengthening heat treatment, Get the alloy layer with higher hardness and tempering resistance. The effects of different heat treatment processes on the microstructure, hardness and tempering resistance of the plasma enhanced tungsten-molybdenum-molybdenum-dysprosium alloy were studied by field emission scanning electron microscopy (ESSO) and microhardness tester. The results show that the plasma tungsten-molybdenum-dysprosium alloy The optimum strengthening heat treatment process of the layer is 1050 ℃ quenching + 550 ℃ tempering, and the carbides in the strengthened layer are distributed in granular form with the largest number, the smallest size (≤1μm) and the non-tempered surface hardness 1144HV_ ( 0.05), tempering at 550 ℃ secondary hardening occurs, the surface hardness reaches 1153 HV0.05.