新型空冷贝氏体渗碳钢的研究  

A Novel Air Cooling Bainite Carburized Steel

作　　者：姜忠良[1] 陈秀云[1] 白飞明[1] 雷淑玲[1] 方鸿生[1] 

机构地区：[1]清华大学材料科学与工程系,北京100084

出　　处：《金属热处理》2002年第10期7-10,共4页Heat Treatment of Metals

基　　金：科技部国家"九五"科技重点推广项目 (970 4 0 1 0 1B)

摘　　要：为了减少齿轮渗碳淬火后的变形和开裂 ,研制了一种新型空冷贝氏体钢 ,其成分为 (质量分数 ,% ) :0 2C ,0 7Si,一定量的Cr、Mn ,测定了其CCT曲线。用空冷贝氏体渗碳钢制作的齿轮 ,经渗碳后空冷 ,齿表面硬度在 6 1HRC以上 ,齿心部硬度在40HRC左右 ,冲击韧度为 82J·cm 2 ,较好地满足了齿轮的硬度和强韧性要求。齿尖渗碳层的显微组织是下贝氏体 +高碳马氏体 ,齿的心部是贝氏体 +低碳马氏体复相组织。这种组织保证了齿轮既具有较高的抗接触疲劳性能又具有较好的抗冲击能力。用该钢制造的齿轮变形小 ,精密度高 。To avoid distortion and cracking of gears in quenching process after carburization,a novel air cooling bainitic carburized steel was prepared.Its composition is 0.2%wt C,0.7%wt Si,some of Cr and Mn.After carburization,the surface hardness,core hardness and impact toughness of the gear made of the novel steel are over 61 HRC,about 40 HRC and 82J·cm -2 respectively,which can well satisfy the demands for hardness and toughness of gears.The microstructure of the gear surface is a composite of low-bainite and high carbon martensite,and its core microstructure is a composite of bainite and low-carbon martensite,which can insure the gear possesses high resistance to contact fatigue and impact.The novel air cooling bainitic gears have the properties of a little distortion,high precision and can greatly reduce the noise during running.

关 键 词：渗碳钢 空冷 渗碳 贝氏体 齿轮钢 

分 类 号：TG142.41[一般工业技术—材料科学与工程] TG161[金属学及工艺—金属材料]