三代轮毂轴承法兰内圈的感应淬火工艺  

Induction quenching process of the third generation hub-bearing flange inner ring

作　　者：许佩宜 顾剑锋[1] 

机构地区：[1]上海交通大学材料科学与工程学院,上海200240 [2]斯凯孚(上海)汽车技术有限公司,上海201814

出　　处：《金属热处理》2015年第10期68-72,共5页Heat Treatment of Metals

基　　金：国家重点基础研究项目(2011CB706604);高档数控机床与基础制造装备重大专项(2012ZX04012011)

摘　　要：研究了感应加热淬火工艺参数对轮毂轴承法兰内圈淬火硬化层和组织的影响。结果表明,随着感应加热总能量的提升,淬硬区宏观轮廓逐渐增大,淬硬层深度加深;内圈淬硬区表层及次表层正常组织为细针马氏体+板条马氏体,淬火加热总能量过高会导致表层过热而形成粗针马氏体,甚至过烧;过渡区正常组织为细针马氏体及少量的铁素体+屈氏体,淬火加热总能量过低会导致过渡区形成大量的屈氏体组织,同时残留铁素体量也会增多。感应淬火加热功率180 k W,加热时间5.4 s为最佳的工艺参数。Effects of induction quenching parameters on hardening depth and microstructure of the third generation hub-bearing flange inner ring were investigated. The results show that macroscopic profile expands obviously and the depth of hardening zone increases with increasing of input energy during induction quenching. The normal microstructure in surface and sub-surface layer consists of fine needle martensite and lath martensite,while the too high input energy results in the surface over-heating and formation of thick needle martensite,even overburning. The normal microstructure in transition zone consists of fine needle martensite,a small amount of ferrite and troostite,but too low input energy causes the presence of a large amount of troostite and the increasing fraction of retained ferrite. The optimum induction quenching process parameters are recommended,including the quenching power of 180 k W and heating time of 5. 4 s.

关 键 词：轮毂轴承 感应淬火 淬火硬化层 马氏体 屈氏体 

分 类 号：TG156[金属学及工艺—热处理]