超细晶WC-Co硬质合金抗拉强度有限元计算方法研究  

Finite element method for tensile strength of ultra-fine grained WC-Co cemented carbide

作　　者：肖杰[1] 张贞贞[1] 张瑞勇[1] 沈伟[1] 任卫[1] XIAO Jie;ZHANG Zhen-zhen;ZHANG Rui-yong;SHEN Wei;REN Wei(Central Iron and Steel Research Institute, Beijing 100081, China)

机构地区：[1]钢铁研究总院

出　　处：《塑性工程学报》2018年第1期241-245,共5页Journal of Plasticity Engineering

摘　　要：基于超细晶WC-Co硬质合金真实金相图片,开展有限元模拟拉伸断裂试验,模拟了硬质合金拉伸断裂的具体过程,并利用LS-DYNA有限元方法预测了超细晶WC-Co硬质合金的抗拉强度。根据数值模拟结果,WC-Co硬质合金抗拉强度为132 MPa。将超细晶WC-Co硬质合金加工成中间钻孔的圆盘,通过改进的巴西劈裂试验,间接测量出超细晶WC-Co硬质合金的最大抗拉强度为114.5 MPa。将数值模拟结果与试验结果进行比较,误差约为15%。数值模拟结果与试验结果比较接近,说明基于超细晶真实金相图片的有限元裂纹扩展模拟能较为准确地再现硬质合金断裂失效的过程,预测材料的力学性能,为分析硬质合金的断裂失效提供依据。Finite element simulation of tensile fracture was generated based on the true metallography of ultra-fine grained WC-Co cemented carbide,the tensile fracture process of the cemented carbide was simulated by finite element model and the maximum tensile strength of 114. 5 MPa for ultra-fine crystalline WC-Co cemented carbide was predicted by LS-DYNA. According to the numerical results,the value of the tensile strength of WC-Co cemented carbide is 132 MPa. The ultra-fine crystalline WC-Co cemented carbide was processed into a disc with a hole,a number of modified Brazil disc split tests were carried out and the maximum tensile strength of 114. 5 MPa for ultrafine crystalline WC-Co cemented carbide was measured by the test indirectly. Comparing the numerical simulation result with the experimental one,the error is about 15%. The simulation result agrees well with the experimental one,which means that the finite element simulation for crack growth based on true metallography can reproduce the failure process of cemented carbide accurately,predict the mechanical properties of the material,and provide basis for analysis of cemented carbide failure.

关 键 词：超细晶WC-Co硬质合金 有限元模拟 抗拉强度 中间钻孔巴西圆盘劈裂试验 

分 类 号：TG174[金属学及工艺—金属表面处理]