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中文摘要：
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。
英文摘要：
Plasma W-Mo-Dy alloying layer on the surface of Q235 steel was formed by double glow plasma surface metallurgy technology and pack carburizing,and its composition closes to metallurgy high- speed steel. Alloy strengthening layer with high hardness and temper resistance was gained by quenching and tempering at different temperatures as complex strengthening heat treatment. Then the effect of heat- treating process on the microscopic structure,hardness and temper resistance of alloy strengthening layer were studied by using FESEM,EDS and microhardness tester. The results show that the optimal process parameters of complex strengthening heat treatment were quenching at 1050 ℃ and then tempering at 550 ℃,and the alloy strengthening layer has the largest number of disperse carbide with smallest size（ ≤1μm）. The surface hardnesses of alloy strengthening layer with no tempering,tempering at 350 ℃ and tempering at 550 ℃ were 1144 HV（0.05）,934HV（0.05）,1153 HV（0.05） respectively.
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