一种基于晶界硬化效应的微细切削本构模型  

A micro-cutting constitutive model based on grain boundary hardening effect

作　　者：王敏婷[1,2] 申利雄 曹明飞 赵磊 李哲 Wang Minting;Shen Lixiong;Cao Mingfei;Zhao Lei;Li Zhe(School of Mechanical Engineering,Yanshan University,Qinhuangdao Hebei 066004,China;Heavy-duty Intelligent Manufacturing Equipment Innovation Center of Hebei Province,Qinhuangdao Hebei 066004,China)

机构地区：[1]燕山大学机械工程学院,河北秦皇岛066004 [2]河北省重型智能制造装备技术创新中心,河北秦皇岛066004

出　　处：《金属热处理》2020年第11期248-254,共7页Heat Treatment of Metals

基　　金：河北省自然科学钢铁联合基金(E2015203343)。

摘　　要：从细微晶粒层面考虑了跨晶界切削、切削颤振等问题,基于晶界硬化效应的霍尔-佩奇定律和常规金属切削本构模型,建立了一种包含材料晶粒平均粒径的微细切削本构模型。通过仿真和切削力试验,对模型的系数进行了修正。研究结果表明,晶粒平均粒径在0.07~0.20 mm时,晶界强化效应较为明显,当晶粒平均粒径超过0.20 mm时,微细切削本构模型对切削力的预测趋势逐渐趋近于常规金属切削本构模型。且随着晶粒平均粒径的增大,常规金属切削本构模型与微细切削本构模型的预测差值逐渐减小。试验数据与理论数据对比验证了微细切削本构模型的准确性。A micro-cutting constitutive model containing average grain size of the material was established by considering transgranular boundary cutting and cutting flutter at the fine grain level,and based on the Hall-Petch relation relating to the grain boundary hardening effect as well as the conventional metal cutting constitutive model.The coefficients of the model were corrected by simulation and cutting force experiments.The results show that the grain boundary strengthening effect is more obvious when the average grain size is 0.07-0.20 mm.When the average grain size exceeds 0.20 mm,the predicted trend of micro-cutting constitutive model for cutting force gradually approaches that of the conventional metal cutting constitutive model.And as the average grain size increases,the prediction difference between the conventional metal cutting constitutive model and the proposed micro-cutting constitutive model decreases gradually.Comparison of experimental data with theoretical data verifies the accuracy of the micro-cutting constitutive model.

关 键 词：晶界硬化 微细切削 本构模型 平均粒径 

分 类 号：TG166[金属学及工艺—热处理]