中碳低合金钢液淬带温等温淬火工艺的优化

Optimization for Liquid Quenching and Isothermal Quenching with Temperature Process of Medium Carbon Alloy Steel

利用液淬带温等温淬火工艺对中碳低合金钢进行热处理,研究了奥氏体化温度和时间、出液温度、等温温度和时间对其组织和性能的影响,对工艺进行了优化。结果表明:试验条件下理想的工艺参数是奥氏体化温度为840℃,保温时间60min,出液温度为238℃,等温温度为300℃,等温时间60min;在此工艺下淬火后试验钢的基体组织为下贝氏体+马氏体,硬度为50 HRC,冲击韧度为26J·cm^(-2),磨损量18mg。

A medium carbon alloy steel was heat-treated by the with temperature process. The effects of austenitizing temperature and quenching and isothermal quenching takin-out-of-liquid temperature and isothermal temperature and time on the microstructure and properties of the steel were discussed and the process was optimized. The results show that under the experimental condition, the ideal process parameters were as follows.. Austenitizing temperature of 840 ℃ and holding time of 60 min, taking-out-of-liquid temperature of 238 ℃, isothermal temperature of 300 ℃ and isothermal time of 60 min. With this process, the matrix microstructure of the tested steel was composed of lower bainite and martensite, the hardness was 50 HRC, impact toughness was 26 J·cm^-2 and abrasion loss was 18 mg.