9Cr18Mo轴承钢中碳化物控制的工艺实践  

Process Practice of Carbide Control in 9Cr18Mo Bearing Steel

作　　者：何曲波 刘海定 赵安中 王金太 刘应龙 赵帅元 HE Qubo1, LIU Haiding1, ZHAO Anzhong2, WANG Jintai2, LIU Yinglong1, ZHAO Shuaiyuan3(1. Chongqing Materials Research Institute Co., Ltd., Chongqing 400707, China; 2. National Engineering Research Center for Instrument Functional Materials, Chongqing 400707, China; 3. Beijing Aerospace Power Research Institute, Beijing 100176, Chin)

机构地区：[1]重庆材料研究院有限公司,重庆400707 [2]国家仪表功能材料工程技术研究中心,重庆400707 [3]北京航天动力研究所.北京100176

出　　处：《热加工工艺》2018年第5期139-142,共4页Hot Working Technology

基　　金：重点产业共性关键技术创新专项重点研发项目(csts2017zdcyzdyfx0101);重庆市青年科技人才培养计划项目(cstc2014kjrcqnrc50005);国家科技支撑计划项目(2015BAE03B01);重庆市重点产业共性关键技术创新专项项目(cstc2015zdcyztzx50002)

摘　　要：以真空感应熔炼＋电渣重熔＋真空自耗重熔工艺冶炼的9Cr18Mo轴承钢为对象,采用金相、电子探针等分析方法研究了不同热加工工艺对碳化物尺寸、均匀性和类型的影响。结果表明,采用直接拔长,最大碳化物尺寸为31.45μm,碳化物不均匀度为3.5级;采用镦粗→拔长,最大碳化物尺寸约为28.45μm,碳化物不均匀度为2.5级;采用镦粗→拔长→扩散退火→拔长,最大碳化物尺寸为22.95μm,碳化物不均匀度为2.0级;淬-回火后,钢中大颗粒碳化物都是M7C3型和M23C7型,与普通方法生产的9Cr18Mo钢中碳化物类型一致。Taking 9Crl8Mo beating steel smelted by vacuum induction melting ＋ electroslag remelting ＋ vacuum consumable remelting process as an object, the influences of different hot processing technologies on the size, uniformity and type of carbides were studied by means of metallography and electron probe. The results show that, the maximum carbide size is 31.45 μm and the carbide uniformity is 3.5 level after direct stretching; the maximum carbide size is about 28.45 μm and the carbide uniformity is 2.5 level afler upsetting→ stretching; the maximum carbide size is about 22.95 μm and the carbide uniformity is 2.0 level after upsetting → stretching→ diffusion annealing→ stretching. After quenching and tempering, the coarse particle carbides in the steel are M7C3 and M23C7, which are the same as those in the 9Cr18Mo steel produced by the general method.

关 键 词：不锈轴承钢 碳化物 扩散退火 锻造工艺 

分 类 号：TG316.2[金属学及工艺—金属压力加工] TG113