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分别采用常规球化退火、循环球化退火和1050℃高温固溶+700℃高温回火三种不同的预热处理工艺处理后,再用840℃淬火+150℃回火工艺处理了GCr15钢试样,研究了经上述三种工艺处理后GCr15钢试样的金相组织和硬度,分析了实验结果和球化机理。结果表明:GCr15钢试样经1050℃高温固溶+700℃高温回火+840℃淬火+150℃回火的热处理工艺,具有工艺过程简便、可操作性较强、生产周期较短、能耗较低和强韧性较好的特点,其热处理后的金相组织为回火马氏体+细小、圆整、比较均匀弥散分布的碳化物。
After being treated by three different preheating treatments, such as conventional spheroidizing annealing, spheroidizing annealing and high-temperature solution treatment at 1050 ℃ and tempering at 700 ℃, the GCr15 steel was treated with 840 ℃ quenching + 150 ℃ tempering In the same way, the microstructure and hardness of GCr15 steel after the above three processes were studied. The experimental results and the spheroidization mechanism were analyzed. The results show that the GCr15 steel sample has the advantages of simple process, strong operability, short production cycle, energy consumption Lower and stronger toughness of the characteristics of its heat treatment after the microstructure of tempered martensite + small, round, relatively uniform dispersion of carbide.