混粉准干式介质下电火花表面强化TC4钛合金的显微裂纹探究
|
摘要
以混粉准干式为工作介质,分别用石墨电极和紫铜电极对TC4钛合金进行电火花表面强化,研究了强化层的微观形貌和显微裂纹。结果表明:工具电极和峰值电流是影响电火花强化TC4钛合金强化层表面微裂纹数量和强化时间的主要因素。正确选用工具电极和峰值电流可获得较好的强化层,且强化层表面微裂纹较少。
With near-dry powder-mixed medium conditions,the surface of TC4 alloy was strengthened by electrical discharge on the graphite electrode and copper electrode respectively.The micro morphology and micro-crack of the strengthening layer were studied.The results show that tool electrode and peak current are the main factors that influence the surface micro-crack and strengthening time of TC4 alloy strengthened by electrical discharge.The better hardening layer can be obtained by choosing the tool electrode and the peak current correctly,and the surface crack of the strengthening layer is less.
With near-dry powder-mixed medium conditions,the surface of TC4 alloy was strengthened by electrical discharge on the graphite electrode and copper electrode respectively.The micro morphology and micro-crack of the strengthening layer were studied.The results show that tool electrode and peak current are the main factors that influence the surface micro-crack and strengthening time of TC4 alloy strengthened by electrical discharge.The better hardening layer can be obtained by choosing the tool electrode and the peak current correctly,and the surface crack of the strengthening layer is less.
引文
[1]LEYENS C,PETERS M.钛与钛合金[M].陈振华,等译.北京:化学工业出版社,2005.
[2]SCHUTZ R W,WATKINS H B.Recent developments in titanium alloy application in the energy industry[J].Materials Science and Engineering:A,1998,243(1-2):305-315.
[3]吕战竹,赵福令,杨义勇.混粉电火花加工表面显微裂纹的研究[J].电加工与模具,2007(2):9-12.
[4]杨平.基于有限元分析的电火花表面强化热应力及裂纹研究[D].天津:天津职业技术师范大学,2015.
[5]周继烈,凌湛,徐建中.硬质合金电火花加工裂纹特性分析[J].电加工与模具,2003(6):19-22.
[6]廖永平,严擎宇.正交试验法在机械工业中的应用[M].北京:中国农业机械出版社,1984.
[7]汤精明,姜忠宇.电火花表面强化层温度场的数值模拟[J].材料热处理学报,2008,29(3):171-175.
[8]蔡兰蓉,陈立君,胡晓军,等.TC4钛合金准干式电火花表面强化温度场-应力场特征研究[J].铸造,2016,65(11):1079-1083.
[9]曲周德,杨平,李敏.基于ABAQUS的单脉冲电火花表面强化数值模拟[J].热加工工艺,2016(2):123-126.
[10]BORMANN R.Understanding die-sinking EDM surface integrity[J].Carbide and Tool Journal,1988,20(6):12-16.
[11]李敏,王宏伟,蔡兰蓉,等.TC4钛合金在不同介质下电火花表面强化研究[J].特种铸造及有色金属,2013,33(6):499-502.
[2]SCHUTZ R W,WATKINS H B.Recent developments in titanium alloy application in the energy industry[J].Materials Science and Engineering:A,1998,243(1-2):305-315.
[3]吕战竹,赵福令,杨义勇.混粉电火花加工表面显微裂纹的研究[J].电加工与模具,2007(2):9-12.
[4]杨平.基于有限元分析的电火花表面强化热应力及裂纹研究[D].天津:天津职业技术师范大学,2015.
[5]周继烈,凌湛,徐建中.硬质合金电火花加工裂纹特性分析[J].电加工与模具,2003(6):19-22.
[6]廖永平,严擎宇.正交试验法在机械工业中的应用[M].北京:中国农业机械出版社,1984.
[7]汤精明,姜忠宇.电火花表面强化层温度场的数值模拟[J].材料热处理学报,2008,29(3):171-175.
[8]蔡兰蓉,陈立君,胡晓军,等.TC4钛合金准干式电火花表面强化温度场-应力场特征研究[J].铸造,2016,65(11):1079-1083.
[9]曲周德,杨平,李敏.基于ABAQUS的单脉冲电火花表面强化数值模拟[J].热加工工艺,2016(2):123-126.
[10]BORMANN R.Understanding die-sinking EDM surface integrity[J].Carbide and Tool Journal,1988,20(6):12-16.
[11]李敏,王宏伟,蔡兰蓉,等.TC4钛合金在不同介质下电火花表面强化研究[J].特种铸造及有色金属,2013,33(6):499-502.