高镜面塑料模具钢P80在线固溶工艺实践  

Process Practice of the On-line Solid Solution of Superior Mirror Surface Plastic Mold Steel P80

作　　者：李声延 刘小林 董富军 廖桑桑 孙乐飞 Li Shengyan;Liu Xiaolin;Dong Fujun;Liao Sangsang;Sun Lefei(Xinyu Iron&Steel Co.,Ltd.,Xinyu 338001)

机构地区：[1]新余钢铁股份有限公司,新余338001

出　　处：《特殊钢》2023年第3期98-103,共6页Special Steel

摘　　要：采用Gleeble 3800热模拟试验机进行了P80在线固溶工艺试验研究,发现开冷温度在870~930℃范围内,温度越低,在线固溶再经过时效后,硬度越高,方差减少,硬度波动降低。在保证获得单相组织,且硬度均匀的前提下,确定了开冷温度与冷却速度等工艺参数:在线固溶工艺为开冷温度860~880℃、冷却速度10℃/s,返红温度≤400℃。利用上述工艺参数进行生产实践,发现在线固溶后的P80钢板经过520℃/3 h时效处理后,组织由贝氏体+马氏体转变为粒状贝氏体+板条贝氏体,硬度为40.1 HRC,满足技术要求,可以实现对离线固溶工艺的替代。The study of P80 on-line solid solution process was tested by Gleeble 3800 thermal simulation testing machine,and the results showed that the open cooling temperature ranged from 870℃to 930℃,the lower the temperature,and the higher the hardness,the higher the variance and the lower the hardness fluctuation after the on-line solid solution and aging.Under the premise of ensuring that obtaining single-phase structure and uniform hardness,the process parameters such as open cooling temperature and cooling speed were determined:the open cooling temperature was 860-880℃,cooling speed was 10℃/s,and the re-reddening temperature not greater than 400℃.Applying the above process parameters to P80 production practice,the results showed that the on-line solid solution P80 steel plate after 520℃/3 hours of aging treatment,the microstructure was transformed from bainite and martensitic to granular bainite and lath bainite,hardness was 40.1 HRC,which could meet the technical requirements,and could replace the off-line solid solution process.

关 键 词：P80钢 塑料模具钢 在线固溶 时效 硬度 

分 类 号：TG161[金属学及工艺—热处理]