摘要
采用不同覆盖率对TC4钛合金进行喷丸,研究了喷丸后TC4钛合金的表面形貌、粗糙度、残余应力场以及经过200℃/1h保温后形变层组织状态等表面完整性性能变化。结果表明:经过300%覆盖率喷丸后,TC4钛合金表面平均粗糙度Ra和均方根粗糙度Rq均比100%覆盖率增大,残余压应力场深度基本与100%覆盖率喷丸工艺相当,但残余压应力数值有所增大;经过200℃/1h保温处理后,由于温度和内应力的驱动,300%覆盖率喷丸后表面"强烈塑变区"发生位错运动和晶体自协调,使表面塑性形变层的残余应力松弛明显,而100%覆盖率喷丸未观察到以上现象。
TC4 titanium alloy was employed to investigate the effect of shot-peening coverage（SPC） on surface integrity, such as surface morphology, surface roughness, residual stress and microstructure after 200℃/1 h heat treatment. The results show that the average roughness Ra, root-mean-square roughness Rq and the value of compressive residual stress increase with the rise of SPC. Dislocation movement and crystal self-coordinating are observed in 300% SPC after 200℃/lh heat treatment due to temperature and inner-stress, which causes the relaxation of residual stress, and more over, the relaxation is not observed in 100% SPC after 200℃/lh heat treatment.
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2013年第3期34-38,共5页
Journal of Aeronautical Materials
关键词
喷丸强化
表面覆盖率
TC4钛合金
位错运动
应力松弛
shot peening
surface coverage
TC4 titanium alloy
dislocation movement
the relaxation of residual stress
