基于ANSYS的混粉准干式电火花表面强化TC4钛合金显微裂纹分析  

Analysis of Micro-cracks of Strengthened Surface on TC4 Alloy by EDM in Powder Mixed Near Dry Medium Based on ANSYS

作　　者：陈立君 石晓婧 张雪东 CHEN Lijun;SHI Xiaojing;ZHANG Xuedong(Tianjin First Light Industry School,Tianjin 300131,China;Tianjin Transportation Technical College,Tianjin 300393,China;The First Vocational School of Tanggu Binhai New Area Tianjin,Tianjin 300480,China)

机构地区：[1]天津市第一轻工业学校,天津300131 [2]天津交通职业学院,天津300393 [3]天津市滨海新区塘沽第一职业中等专业学校,天津300480

出　　处：《电加工与模具》2020年第S01期28-31,35,共5页Electromachining & Mould

摘　　要：利用有限元法对电火花表面强化TC4钛合金温度场进行模拟仿真,在其他条件不变的情况下,分析了不同电流强度对强化层温度场分布和变化的影响规律。以仿真模型参数为试验强化参数,在混粉准干式介质中,以石墨棒为工具电极对TC4钛合金进行表面强化,利用扫描电子显微镜对强化层微观形貌进行观测,对比分析了强化实验结果与模拟仿真结果。结果显示,随着电流强度升高,温度场温度梯度变大,热应力变化变强,造成强化层表面微裂纹增多。This paper control the current intensity with other conditions unchanged,using the finite element method to simulate the EDM surface strengthening on TC4 alloy,and analyze different current intensity on the strengthening effect of distribution and change of temperature fields.As the parameters of simulation model used to strengthen the parameters,strengthened surface on TC4 alloy with graphite electrode in the near-dry-powder-mixed Medium.Using SEM to observe the morphology of the strengthening layer,the comparative analysis of the experimental results and simulation results draw a conclusion.With the increasing current intensity,the temperature field and temperature gradient become larger,and the thermal stress changes more strongly,resulting in an increase in the surface micro-cracks of the strengthening layer.

关 键 词：混粉准干式 电火花表面强化 温度场 微裂纹 

分 类 号：TG661[金属学及工艺—金属切削加工及机床]