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研究了不同时效工艺对螺栓组织和性能的影响。采用热处理加热装置进行系列工艺试验研究时效规律,借助光学显微镜、扫描电镜、拉伸试验机等设备,分析时效工艺对材料组织及性能的影响。研究结果表明:提高时效温度和延长时效时间皆使硬度升高;适合生产的最佳时效工艺为250~300℃,2.5 h,时效工艺和表面处理工艺可以同时进行;柯氏气团、铁素体中亚晶的形成和弥散碳、氮化合物析出是时效强化的主要原因。
The effects of different aging processes on the structure and properties of the bolts were studied. The heat treatment heating device was used to carry out a series of experiments on aging law. The effects of aging process on the microstructure and properties were analyzed by means of optical microscope, scanning electron microscope and tensile testing machine. The results show that both the aging temperature and the aging time increase the hardness; the best aging process suitable for the production is 250-300 ℃ for 2.5 h, and the aging process and the surface treatment process can be carried out at the same time; the Kirschner air mass, ferrite The formation of middle-subgrains and the diffusion of carbon and nitrogen compounds are the main reasons for the aging strengthening.