显微组织参量对马氏体-贝氏体复相组织轴承钢屈服强度的影响研究  

Influence of Structural Parameters on the Yield Strength of Tempered Bearing Steel with Martensite-Bainite Dual Phase Structure

作　　者：徐佐仁[1] 黄兴家[1] 

机构地区：[1]上海交通大学材料科学及工程系

出　　处：《上海交通大学学报》1991年第1期73-80,共8页Journal of Shanghai Jiaotong University

摘　　要：本文研究了GCr15轴承钢在M_s点上下保温不同时间等温淬火并低温回火后,显微组织参量和残留奥氏体量随贝氏体体积分数变化的规律,测定了不同贝氏体体积分数时复相轴承钢的屈服强度、冲击韧性等力学性能数据.复相组织中马氏体相屈服强度与有效晶粒尺寸的关系符合Hall-Petch 晶粒细化强化模型,而下贝氏体相的铁素体条片宽度((?)_B)和碳化物粒子间距((?)_c)分别按Langford-cohen 亚结构强化关系和Orowan 弥散强化关系为屈服强度增值作出贡献,残留奥氏体量则将导致屈服强度下降.综合复相组织中各相的显微组织参量对屈服强度的影响规律并进行数学处理,导出马氏体-下贝氏体复相轴承钢屈服强度的数学表达式,并用力学性能测试数据予以校核,吻合较好.A study was made of the change of structural parameters andretained austenite as a function of volume fracion of lower bainite decomposedin GCr 15 bearing steel,aftr isothermal quenching and tempering.Mechanicalproperties of martensite-lower bainite dual phase structure were tested.Therelation of the yield strength of martensite in the dual phase structure and theeffective grain size agrees well with the Hall-Petch model while strengthening mechanism about the width of ferrite plates of lower bainite((?)_B)and thelength of dispersion of carbides((?))is controlled both by the Langford-Cohen relationship of sub-structure hardening and Orowan dispersion streng-thening effect.On the contrary,the retained austenite may set disfavoureffect to course the decrement of yield strength.The present investigationattempts to evaluate the magnitude of these individial contributions to thestrength of martensite—lower bainite dual phase structure.An empiricalequation was deduced which agreed well with the experimental results.

关 键 词：轴承钢 屈服强度 热处理 显微组织 

分 类 号：TG142.41[一般工业技术—材料科学与工程]