喷丸、喷砂与HVOF WC-17Co涂层表面完整性对TC18钛合金疲劳性能的影响

航空材料学报, 2013, 33(5): 13-21. doi: 10.3969/j.issn.1005-5053.2013.5.003

喷丸、喷砂与HVOF WC-17Co涂层表面完整性对TC18钛合金疲劳性能的影响

杜东兴 ^1, , 刘道新 ^2, , 孟保利 ^3, , 张晓化 ^4,

1.西北工业大学航空学院,西安710072

2.西北工业大学航空学院,西安710072

3.西安飞机国际航空制造股份有限公司,西安710089

4.西北工业大学航空学院,西安710072

基金项目: 国家自然科学基金(51171154,51101127)

关键词： TC18钛合金 , 表面完整性 , 超音速火焰喷涂(HVOF) , 疲劳性能

Effects of Surface Integrity of Shot Peening, Grit Blasting and HVOF Sprayed WC-17Co Coating on Fatigue Properties of TC18 Titanium Alloy

DU Dong-xing ^1, , LIU Dao-xin ^2, , MENG Bao-li ^3, , ZHANG Xiao-hua ^4,

1.西北工业大学航空学院,西安710072

2.西北工业大学航空学院,西安710072

3.西安飞机国际航空制造股份有限公司,西安710089

4.西北工业大学航空学院,西安710072

Keywords： TC18 titanium alloy , surface integrity , HVOF , fatigue property

为了探讨喷丸、喷砂与HVOF WC-17Co涂层表面完整性对Ti5A15Mo5V1Cr1Fe(TC18)钛合金疲劳性能的影响规律和作用机制,利用X射线衍射仪(XRD)、表面粗糙度仪、显微硬度计、扫描电子显微镜(SEM)以及X射线应力测试仪等分析了喷丸、喷砂及其复合超音速火焰喷涂(HVOF)WC-17Co涂层的表面完整性,利用旋转弯曲疲劳试验机研究了上述表面处理对TC18钛合金疲劳性能的影响规律.结果表明,喷丸预处理比喷砂预处理能够使TC18钛合金表面获得更好的表面完整性,因而显著提高了TC18钛合金的疲劳抗力,而喷砂处理对TC18钛合金疲劳抗力无明显影响.喷丸后进行HVOF WC-17Co涂层处理使TC18钛合金疲劳寿命提高6倍,原因归于喷丸层内仍保留数值较大、分布较深的残余压应力,有效延缓疲劳裂纹的萌生和早期扩展.喷砂后进行HVOF WC-17Co涂层处理使TC18钛合金疲劳抗力显著降低,原因是HVOF过程的高温效应使喷砂层内残余压应力场松弛,使喷砂表面缺口效应和损伤的不利影响作用突显,加之WC-17Co涂层韧性低、表面粗糙度大、存在孔洞型缺陷,不利于抗疲劳性能.

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