期刊文献+

TC4激光拼焊板超塑成形试验研究 被引量:3

Experimental Study on Superplastic Forming of TC4 Laser Tailor-welded Blanks
下载PDF
导出
摘要 利用2kW YAG激光机,拼焊了厚度0.93mm细晶Ti6Al4V(TC4)板材,焊缝强度高于母材。焊接熔池区未出现裂纹或大的气孔,焊缝热影响区宽度约为0.3~0.4mm。在温度880℃和应变速率10-3s-1下,模拟分析了TC4激光拼焊板超塑成形过程,获得了压力时间加载曲线。对比研究了TC4激光拼焊板和其母材的超塑成形极限,结果表明:TC4激光拼焊板与TC4母材超塑成形性能无明显差别。微观组织观测显示:随着超塑变形量增大,激光拼焊过程中产生的针状α′马氏体,先转变为板条状马氏体,再因动态再结晶而破碎,同时α+β组织分数逐渐增多。 Fine grained Ti6Al4V alloy sheets with 0.93 mm thickness are tailor-welded using a 2kW Nd:YAG laser machine.At optimal welding parameters,i.e.the combination of laser power,welding speed,focus and shielding argon gas,weld joints without cracks and large porosity were obtained.At room temperature,uniaxial tensile tests were preformed revealing that the strength of weld joints is higher than the parent sheet.At the temperature of 880℃ and the strain rate of 10-3s-1,superplastic forming processes were simulated using a FEM software MSC.MARC and the gas pressure vs.forming time curve was obtained.Superplastic bulging tests of the laser tailor-welded blanks were investigated indicating that the weld joints almost has no negative effect on superplastic deformation.Microstructural observations indicate that the acicular α? martensite produced during welding in the fusion zone transforms into the lath martensite initially and that simultaneous development of the lath martensite fragmentation as a result of dynamic recrystallization and the fraction of(α+?) phase increase as the superplastic strain propagation.
出处 《航天制造技术》 2011年第1期21-24,37,共5页 Aerospace Manufacturing Technology
关键词 钛合金 激光拼焊 超塑成形 金相分析 titanium alloy laser tailor-welding superplastic forming metallographic analysis
  • 相关文献

参考文献4

二级参考文献37

  • 1唐霞辉,朱海红,朱国富,李家.高功率CO_2激光焊接等离子体的控制[J].激光技术,1995,19(5):314-316. 被引量:1
  • 2肖荣诗,左铁钏.CO_2激光深熔焊接光致等离子体控制的研究[J].中国激光,1997,24(5):461-466. 被引量:7
  • 3HAN Wen-bo, ZHANG Kai-feng, WANG Guo-feng. Superplastic forming and diffusion bonding for honeycomb structure of Ti-6Al-4V alloy[J]. Journal of Materials Processing Technology, 2007, 183(2/3): 450-454.
  • 4BOTTOMLEY I E. Superplastic forming and diffusion bonding of aircraft structures[J]. Journal of Aerospace Engineering, 1995,209(3): 227-231.
  • 5MA Z Y, MISHRA R S, MAHONEY M W. Superplastic deformation behaviour of friction stir processed 7075A1 alloy[J]. Acta Materialia, 2002, 50(17): 4419-4430.
  • 6HANADI G, SALEM A, ANTHONY P R. Mierostructure and retention of superplasticity of friction stir welded superplastic 2095 sheet[J]. Scripta Materialia, 2002, 46(5): 337-342.
  • 7HUANG J C, SHEN Y D, HAO N J. Characterization of electron beam welding of superplastic 8090 Al-Li alloys[J]. Materials Science and Technology, 1994, 10(6): 647-657.
  • 8CASALINO G, CURCIO F, MEMOLA F. Investigation on Ti6Al4V laser welding using statistical and Taguchi approaches[J]. Journal of Materials Processing Technology, 2005, 167(2/3): 422-428.
  • 9CAIAZZO F, CURCIO F, DARRELIO G, MEMOLA C M F. Ti6Al4V sheets lap and butt joints carded out by CO2 laser: mechanical and morphological characterization[J]. Journal of Materials Processing Technology, 2004, 149(1/3): 546-552.
  • 10ZHANG L, GOBBI S L, NORRIS I, ZOLOTOVSKY S, RICHTER K H. Laser welding techniques for titanium alloy sheet[J]. Journal of Materials Processing Technology, 1997, 65(1/3): 203-208.

共引文献20

同被引文献20

引证文献3

二级引证文献9

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部