激光冲击强化近α钛合金的热稳定性  

Thermal Stability of Near α Titanium Alloy by Laser Shock Process

作　　者：贾蔚菊[1] 刘海涛[2] 赵恒章[1] 韩栋[1] 乔博[2] 洪权[1] 郭萍[1] 

机构地区：[1]西北有色金属研究院,陕西西安710016 [2]中国船舶重工集团公司第十二研究所,陕西兴平713012

出　　处：《热加工工艺》2014年第16期112-114,119,共4页Hot Working Technology

基　　金：国家"973"计划项目(2011CB012805)

摘　　要：采用激光冲击强化工艺对近α型Ti834高温合金进行了表面处理,研究了激光冲击前后合金在600℃×100h的热稳定性和微观组织特征,并采用扫描电镜法分析了合金在不同状态下的拉伸断口特征。结果表明,合金经毛坯热暴露后,强度略有提高,而塑性变化不大;而经试样热暴露后,合金强度略有降低,塑性降低幅度较大。激光冲击处理使试样热暴露后的合金强度提高,而塑性进一步降低。在激光冲击处理过程中,合金表面晶体缺陷的形成是导致合金塑性进一步降低的主要原因。The near α titanium alloy Ti834 was laser shock-processed（LSP） by high intensity laser. The thermal stability and characteristic of the microstructure before and after LSP（600℃×100h）were studied, and the morphologies of fracture surface wereanalyzed by SEM. The results show that, after thermal exposure, the strength has a little increase but the ductility has nearly no change for the specimens having removed the oxide scale before testing. Both of the strength and ductility decrease for the specimens with oxide scale on the surface. However, for the laser shock processed specimens, the strength increases obviously, but the ductility decreases furtherly after thermal exposure. The formation of high density defects on the surface of the alloy during LSP are the main reasons for leading to the decrease of the ductility.

关 键 词：近Α钛合金 激光冲击强化 热暴露 微观组织 

分 类 号：TG146.4[一般工业技术—材料科学与工程]