基于深层QPQ技术的氧化工艺影响工件表面硬度的研究

摘要

研究了基于深层QPQ技术的氧化工艺对工件表面硬度的影响.首先将工件经过645℃的高温盐浴渗氮(QPQ)处理1.5h,再通过不同的温度进行氧化处理,氧化温度在225 ℃到420 ℃之间选取7个温度.由试样的表面硬度数据可知:随着氧化温度的降低,试样的表面硬度有所提高.通过X射线衍射分析得出:表面硬度的提升是由于试样在氧化时含氮奥氏体层中有纳米级的含氮物质析出,纳米级的弥散分布在奥氏体层起到弥散强化的作用,从而提升表面硬度.%The workpiece was processed with salt bath nitriding (QPQ) for 1.5 hours at high temperature of 645 ℃ , then treated through different temperature oxidation, at the temperature of seven selected temperatures between 225 ℃ and 420 ℃. The surface hardness data of the sample was obtained;the surface hardness improved at lower temperature oxidation. Through X - ray diffraction a-nalysis, it is concluded that the surface hardness of ascension is due to nanoscale nitrogenous substance precipitation in the oxidation of nitrogen austenitic galleries. Nanoscale dispersion distribution in austenitic galleries plays the role of dispersion strengthening, hence, enhances the surface hardness of the sample.