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研究了不同铜含量的含硼低碳钢的时效行为,对时效后的试验钢进行显微硬度测试,并用光学显微镜及电镜观察组织及析出物,分析时效工艺和硼含量对硬度及析出粒子的影响。结果表明:含铜钢的时效是析出硬化与组织软化作用相互影响的结果。随时效温度升高,析出峰值由双峰变为单峰及无峰值。添加微量硼可替代部分铜而硬度变化不明显,在稳定马氏体结构、推迟基体软化方面,复合添加硼和铜比单纯加铜更显著。
The aging behavior of boron-containing low-carbon steel with different copper contents was studied. The hardness of test steel after aging was tested. Microstructure and precipitates were observed with light microscope and electron microscope. The effects of aging process and boron content on hardness and precipitation of particles influences. The results show that the aging of copper-bearing steel is the result of the interaction between precipitation hardening and tissue softening. With the aging temperature increases, the precipitation peak from double peaks into a single peak and no peak. Adding a trace amount of boron can replace part of the copper and hardness changes insignificantly, in the stable martensite structure, delaying the matrix softening, the composite addition of boron and copper is more significant than simply adding copper.