Effect of minor change in composition on toughness of weldmetal for repair of turbine blades made of martensitic stainless steel

C. R. Das, S. K. Albert, A. K. Bhaduri, G. Srinivasan, V. Ramasubbu

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Repair welding procedure for cracked turbine blades, made of 13Cr-2.6Ni-1.1Mo martensitic stainless steel, has been developed using gas tungsten arc welding process and a twin wire filler metal. The twin wire consists of a 1.5 mm diameter ER 16-8-2 and a 2.0 mm diameter ER 410 filler wires tack welded along the length of the two filler wires. A two stage post-weld heat treatment at 675 degrees C for 2 h and 615 degrees C for 4 h, such that the first heat treatments is above the Ac-1 temperatures of the weld metal and the second is just below its Ac1 temperature; has been found to be suitable for obtaining good mechanical properties for the weldment. The weldment has a good combination of transverse weldment strength and weldmetal toughness, with its room temperature yield strength and Charpy V notch impact toughness being similar to that of the turbine blade material.
Original languageEnglish
JournalScience and Technology of Welding and Joining (Online Edition)
Volume13
Issue number2
Pages (from-to)159-166
ISSN1743-2936
DOIs
Publication statusPublished - 2008
Externally publishedYes

Keywords

  • Impact toughness
  • Martensite
  • Repair welding
  • Turbine blade
  • Twin wire filler metal
  • Two stage post-weld heat treatment

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