30CrMnSi钢的等温淬火工艺  

Austempering process of 30CrMnSi steel

作　　者：付星 郭兆东 姚中涛 宋骐羽 徐微 洪嘉琪 陶宇航 秦颖 Fu Xing;Guo Zhaodong;Yao Zhongtao;Song Qiyu;Xu Wei;Hong Jiaqi;Tao Yuhang;Qin Ying(Jilin Jiangji Special Industry Co.,Ltd.,Jilin Jilin 132021,China)

机构地区：[1]吉林江机特种工业有限公司,吉林吉林132021

出　　处：《金属热处理》2024年第11期172-177,共6页Heat Treatment of Metals

摘　　要：采用金相显微镜和硬度计对30CrMnSi钢等温淬火处理后的显微组织及硬度进行了研究。结果表明,30CrMnSi钢热轧管经880℃保温30 min正火预处理替代传统退火处理后,适合切削加工;经工艺优化,最佳等温淬火工艺为890℃奥氏体化30 min,420~440℃等温1~1.5 h,经优化工艺处理后,可得到下贝氏体组织,硬度在37~39 HRC范围,满足产品设计要求。Microstructure and hardness of 30CrMnSi steel after austempering treatment were studied by using metallurgical microscope and hardness tester.The results show that the hot-rolled tube of the 30CrMnSi steel is suitable for cutting processing after normalizing pretreating at 880℃for 30 min instead of traditional annealing treatment.The optimal austempering process for the 30CrMnSi steel is optimized to be austenitizing at 890℃for 30 min,followed by isothermal treating at 420-440℃for 1-1.5 h.After treating by the optimal process,lower bainite can be obtained,with hardness ranging from 37 HRC to 39 HRC,meeting the design requirements of the product.

关 键 词：等温淬火 30CRMNSI钢 显微组织 硬度 

分 类 号：TG142.1[一般工业技术—材料科学与工程]