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设计了3Cr2Mo塑料模具钢的高速铣削试验方案,借助显微硬度计和X线衍射分析仪测量了铣削加工后硬化层硬度沿层深的分布,用专业数据分析软件得出洛氏硬度与X线衍射峰半高宽之间的相关性曲线,同时建立两者之间的拟合公式,再用透射电镜观察硬化层的位错结构,用位错理论分析了加工硬化的形成机理。结果表明:随着主轴转速的增大,半高宽呈减小的趋势,说明表面硬化程度随主轴转速的提高略有下降;通过洛氏硬度与半高宽间的数学模型,可以较准确地预测3Cr2Mo的硬度;利用透射电镜观察到位错密度的增加,这与半高宽的增大一致。
Design the 3Cr2Mo plastic mold steel high-speed milling test program, with the help of microhardness tester and X-ray diffraction analyzer measured the hardness of the hardened layer along the depth of the distribution after milling, using professional data analysis software derived Rockwell hardness and X-ray The relationship between the FWHM and the full width at half maximum (FWHM) of the diffraction peaks was obtained. At the same time, the fitting formula between them was established. Then the dislocation structure of the hardened layer was observed by transmission electron microscope. The formation mechanism of work hardening was analyzed by dislocation theory. The results show that the FWHM decreases with the increase of the spindle speed, which shows that the degree of surface hardening slightly decreases with the increase of the spindle speed. The mathematical model between Rockwell hardness and FWHM can be more accurately The hardness of 3Cr2Mo was predicted. The increase of dislocation density was observed by TEM, which was consistent with the increase of FWHM.