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研究了不同温度下QPQ处理对高强度紧固件微观组织和力学性能的影响。结果表明:QPQ处理后形成了较厚的渗氮层,处理温度越高,渗氮层越厚。QPQ处理能明显提高显微硬度。经480℃处理的试样的综合力学性能最好。化合物层为脆性断裂,中间层的断裂类型与冷却后的产物﹑比例及分布有关,扩散层为沿晶断裂。
The effects of QPQ treatment on microstructure and mechanical properties of high strength fasteners at different temperatures were studied. The results show that a thicker nitrided layer is formed after QPQ treatment. The higher the treatment temperature, the thicker the nitrided layer. QPQ treatment can significantly improve the microhardness. The samples treated at 480 ℃ have the best comprehensive mechanical properties. The compound layer is brittle fracture, and the type of fracture in the middle layer is related to the product, proportion and distribution after cooling, and the diffusion layer is intergranular fracture.