40Cr钢磨削强化温度与冷却速度研究

以40Cr调质钢为磨削强化试验对象，进行了磨削强化温度的测量和冷却速度的确定，并对强化效果进行了分析研究。试验结果表明：预估温度与测量温度接近，可以获得所要求的磨削强化温度和冷却速度；获得了理想的强化效果，强化层平均显微硬度为HV670，厚度接近1．3mm，组织为细小的针状马氏体。

GRINDING TEMPERATURE AND COOLING RATE DURING GRIND-HARDENING OF 40Cr STEEL

The mathematical model of the grinding temperature is established. The grinding temperature and the cooling rate are measured in the grind-hardening process of 40Cr steel under different conditions. Moreover, the grind-hardening effects are investigated. Experimental results show that the calculated temperatures are comparatively close to the measured ones, and the required temperature and cooling rate can be achieved. Furthermore, the microstructure of the hardened zone is similar to that obtained through the high-frequency induction technique. The average hardness of the entirely hardened zone is HV670 and the thickness of the hardened layer is adjacent to 1.3 mm. It indicates that the hardening mechanism induced by the grinding heat and high-frequency heating is identical.Finally, the fine needlelike martensite is obtained.