Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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Effects of PWHT on Weld Metal Properties of YS 460 MPa Steels for Ship and Offshore Structures

선박·해양 구조물용 YS 460 MPa 강재의 용접금속 특성에 미치는 PWHT의 영향

  • 강창룡 (부경대학교 금속공학과) ;
  • 정상훈 (조선선재(주) 기술연구소)
  • Received : 2014.07.04
  • Accepted : 2014.08.21
  • Published : 2014.08.31
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Abstract

This paper has an aim to study the effect of PWHT(for 140min. at $600^{\circ}C$) on FCAW weld metal properties (tensile, charpy impact and CTOD value) of YS 460 MPa steels for ship and offshore structures. On the basis of these study, it was found that strength was decreased and elongation was increased by PWHT. These phenomenon resulted from the reduction of acicula ferrite volume fraction by grain growth. Also, Charpy impact and CTOD value were decreased by PWHT. These phenomenon resulted from grain growth. Because the grain boundary grown by PWHT can play a role as crack initiation site and make the crack propagate more easily. Although weld metal properties were decreased by PWHT, tensile and impact properties could meet the class societies requirements for welds of YS 460 MPa steel, but decrease of fracture toughness need to be consider seriously.

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References

  1. T. W. Park, I. O. Shim, Y. W. Kim and C. Y. Kang : The effects of PWHT on the toughness of weld HAZ in Cu-containing HSLA-100 steel, Journal of KWS, 13-4 (1995), 55-64 (in Korean)
  2. D. H. Ju, B. S. Jang, Y. M. Lim and J. H. Koh : The effect of heat input and PWHT on the mechanical properites and microstructure of HSB600 steel weldments with GMAW, KAIC, 13-5(2012), 1939-1946
  3. J R Still and J H Rogerson : The effect of post weld heat treatment(PWHT) on the properties of weld metals containing Ti, B and Mo, Metal Construction 1985 March, 120-123
  4. Japan Pressure Vessel Research Council : Characterization of PWHT Behavior of $500N/mm^2$ Class TMCP Steels, WRC Bulletin 371, April (1992)
  5. Offshore standard : Fabrication and Tesing of Offshore structures, DNV-OS-C401 (2013)
  6. Rules for the manufacture, testing and certification of materials, Chapter 13, LR (2011)
  7. Rules for the classification of steel ships, Part 2, KR (2013)
  8. A. A. Wells : The Mechanics of the Fracture Transition in Yielding Materials, CODA P46 document (1970)
  9. Fracture mechanics toughness tests, BS 7448 Part 2, British standards institution (1997)
  10. H. J. Kim and B. Y. Kang : Microstructural Characteristics of Steel Weld metal, Journal of KWJS, 18-5 (2000), 25-32 (in Korean)
  11. J. H. Chen, G. Z. Wang, C. Yan, H. Ma and L. Zhu : Advances in the Mechanism of Cleavage Fracture of Low Alloy Steel at Low Temperature, Int. J. Frac. 83-2 (1997) 105-120 https://doi.org/10.1023/A:1007306932437
  12. G. T. Hahn : The Influence of Microstructure on Brittle Fracture Toughness, Metall. Trans. A, 15-6 (1984) 947-959 https://doi.org/10.1007/BF02644685
  13. S. Y. Shin, K. J. Woo, B. C. Hwang, S. H. Kim and S. H. Lee : Analysis of Fracture Toughness in Transition Temperature Region of API X70 and X80 Linepipe steels, J. Kor. Inst. Met & Mater., 45-8 (2007) 447-457 (in Korean)
  14. S. W. Kang, M. H. Kim, Y. T. Shin and H. W. Lee : The Effect of Heat Input on Fracture Toughness in Submerged Arc Offshore Steel Weldments, Journal of the Society of Naval Architects of Korea, 41-6 (2004) 40-47 (in Korean) https://doi.org/10.3744/SNAK.2004.41.6.040
  15. D. J. Abson and R. J. Pargeter : Factors Influencing As-deposited Strength, Microstructure and Toughness of Manual Metal and Arc welds Suitable for C-Mn Steel Fabrications, International Metal Reviews, 31(1986) 141-194
  16. R. A. Farrar and P. L. Harrison : Acicular Ferrite in Carbon Manganese Weld Metals: An overview, Journal of Materials Science, 22-11(1987) 3812-3820 https://doi.org/10.1007/BF01133327

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