表面复合强化处理后Ti17钛合金的显微组织和耐磨性能  

Microstructure and Wear Resistance of Ti17 Titanium Alloy after Surface Treatment with Composite Strengthening Process

作　　者：王少鹏[1] 乔生儒[2] 张程煜[2] 

机构地区：[1]西北有色金属研究院腐蚀与防护研究所,西安710016 [2]西北工业大学超高温结构复合材料实验室,西安710072

出　　处：《机械工程材料》2015年第12期17-21,共5页Materials For Mechanical Engineering

基　　金：国家重点基础研究发展计划项目(2012CB625100)

摘　　要：分别以硅青铜和YG-8合金为电极进行瞬态电能表面强化结合离子束增强沉积硅青铜对Ti17钛合金进行表面复合强化,研究了电极材料对其组织和耐磨性能的影响。结果表明:Ti17钛合金表面复合强化层由瞬态电能强化层和铜沉积层组成,铜沉积层组织致密,无气孔、微裂纹等缺陷,与瞬态电能强化层结合良好;以硅青铜为电极强化处理后的钛合金表面复合强化层厚约6μm,强化层及界面处无微孔、裂纹等缺陷,表面硬度为517 HV,耐磨性能较未强化的提高了20倍;以YG-8合金为电极处理后的钛合金表面复合强化层厚约15μm,在其瞬态电能强化层中存在少量的微孔和微裂纹,表面硬度为537HV,耐磨性能较未强化的提高了30倍;复合强化后Ti17钛合金的摩擦因数比未强化的略有下降。The surface of Ti17 titanium alloy was composite strengthened by the electrical discharge surface hardening with silicone bronze and YG-8alloy as electrode material respectively and consequent ion beam enhanced deposition with silicone bronze,and the effects of different electrode materials on the microstructure and wear resistance were investigated.The results show that the composite strengthening coating on the Ti17 titanium alloy was composed of the electrical discharge strengthening layer and bronze deposition layer.The bronze deposition layer had a compact microstructure without defects such as pores and micro-cracks and bonded well with the electrical discharge strengthening layer.The thickness of the composite strengthening coating formed with the electrode made of silicone bronze was 6μm,and the surface hardness of the surface strengthened titanium alloy was 517 HV,and then the wear resistance was 20 times larger than that of Ti17 titanium alloy without strengthening;the thickness of the composite strengthening coating with YG-8alloy as electrode material was 15μm,the surface hardness was 537 HV,and the wear resistance was 30 times larger than that of the alloy without strengthening.The friction coefficient of the Ti17 titanium alloy after composite strengthening was slightly reduced compared with that before strengthening.

关 键 词：复合强化层 耐磨性 瞬态电能 离子束增强沉积 

分 类 号：TG146.2[一般工业技术—材料科学与工程]