QPQ处理对高强度紧固件力学性能的影响
Effects of QPQ Treatment on Mechanical Properties of High Strength Fastener
饶小松, 罗德福
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作者单位：(西华大学 材料科学与工程学院, 四川 成都 610039)
中文关键字：高强度紧固件； QPQ盐浴复合处理； 力学性能
英文关键字：high strength fastener; QPQ composite salt bath; mechanical properties
中文摘要：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。
英文摘要：The effects of QPQ treatment at different temperature on the microstructure and mechanical properties of high strength fastener were studied. The results show that a thick nitrided layer is formed after salt bath nitriding. The higher the temperature, the thicker the nitrided layer. The tensile strength, yield strength, elongation and reduction of the sample processed at 480 ℃ is much more perfect than the other. The compound layer is brittle fracture. The fracture type of the middle layer is related to the cooling product, ratio and distribution. The diffusion layer is intergranular fracture.