Relaxing welding residual stresses by diamond like carbon coating on duplex titanium alloys

H. H. Lee, S. H. Wang, C. Y. Shih, Ching-min Cheng, H. C. Hsu, K. Kan, C. M. Sung

Research output: Contribution to journalArticle

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The distribution of welding residual stresses in titanium alloy plates composed of Ti-6Al-4V (Ti-64) and Ti-4-5Al-3V-2Mo-2Fe (SP700) alloys was measured and calculated under the same heat input. Ti-64 alloy exhibited a higher residual tensile stress than the SP700 alloy due to the low thermal conductivity and thermal dlffusivity of the former alloy, In addition to its high thermal expansion coefficient. Diamond like carbon (DLC) thin film deposited on the as welded titanium alloy plates reduced the magnitude of the welding residual stress caused by the cathodlc arc physical vapour deposition (PVD) process. The distribution of the measured welding residual stresses agreed with the finite element method (FEM) simulated results very well.

Original languageEnglish
Pages (from-to)75-79
Number of pages5
JournalScience and Technology of Welding and Joining
Issue number1
Publication statusPublished - 2008 Jan 1



  • Cathodic arc PVD
  • Diamond like carbon
  • Finite element
  • Residual stress
  • Welding

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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