摘要
对高强汽车钢板进行二次淬火和回火处理,研究不同热处理工艺参数对钢板抗拉强度、屈服强度、屈强比和显微组织的影响,分析了其作用机理。结果表明,随着二次淬火温度的升高,汽车钢板的抗拉强度呈现逐渐上升的趋势,而屈服强度呈现先减小而后增加的趋势;二次淬火温度为740~780℃时,汽车钢板可以取得较高的抗拉强度和较低的屈强比,可以作为适宜的二次淬火温度;回火温度从500℃上升至620℃时,汽车钢板的屈强比在0.864~0.885之间波动;740℃二次淬火和620℃回火态钢板中弥散析出的ε-Cu相可以起到沉淀强化的作用。
Automobile steel plate was secondary quenched and tempered, the effects of different heat treatment parameters on tensile strength, yield strength, tensile ratio and microstructure of the steel plate were studied, and the mechanism was analyzed. The results show that, with secondary quenching temperature increasing, the tensile strength of the steel has gradually rising trend, while the yield strength shows a trend of first decreasing and then increasing. When the secondary quenching temperature is up to 740 -780 ℃, the steel plate can obtain higher tensile strength and lower yield strength ratio, which can take as suitable secondary quenching temperature. When the tempering temperature of the steel plate rising from 500 ℃ to 620 ℃, the yield strength ratio fluctuations between 0.864-0.885; the ε-Cu phase precipitated from the steel plate after the secondary quenched at 740 ℃ and the tempered at 620 ℃ can play a role of precipitation strengthening.
出处
《铸造技术》
CAS
北大核心
2016年第12期2568-2570,共3页
Foundry Technology
基金
江西省科技厅项目(项目编号:20161BBE50074)
关键词
汽车钢板
二次淬火
回火
力学性能
显微组织
automobile steel plate
second quenching
tempering
mechanical properties
microstructure
