摘要
采用超音速火焰喷涂技术在Ti-6Al-4V合金表面制备WC-17Co涂层,从显微形貌、界面氧化行为、裂纹扩展形式等方面系统分析了WC-17Co涂层与Ti-6Al-4V基体界面断裂失效原因,并利用四点弯曲法测量了WC-17Co与Ti-6Al-4V合金的平均断裂能量释放率.结果表明,热喷涂过程使Ti-6Al-4V的表面氧化相含量显著提高.氧化后Ti-6Al-4V的表面显微硬度达到322.4 HV,熔融粒子撞击到Ti-6Al-4V表面很难对基体造成明显的塑性变形,不能形成有效咬合,使得钛合金与WC-17Co涂层的结合性能偏低.
A WC-17Co coating was fabricated on the face of titanium alloy by using high velocity oxy-fuel( HVOF) technology. The bonding properties between WC-17Co coating and Ti-6Al-4V substrate were discussed. The reasons of boundary fracture were analyzed through the microscopic morphology,oxidation behavior,and the form of crack propagation. Critical strain energy release rate Gss of WC-17Co/Ti-6Al-4V is measured by four-point bending test. The low interface bonding strength of WC-17Co/Ti-6Al-4V was ascribed to the increased micro-hardness( 322. 4 HV) of Ti-6Al-4V after oxidization,so it does not generate apparent deformation when molten particles impact on its surface.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2017年第2期5-9,共5页
Transactions of The China Welding Institution
基金
国家自然科学基金青年基金资助项目(51501222)
中央高校基本科研业务经费中国民航大学专项基金资助项目(3122015L001)
中国民航局科技计划资助项目(MHRD20160106)
