Metallurgical and Materials Transactions A

, Volume 49, Issue 11, pp 5323–5332 | Cite as

Microstructural and Finite Element Analysis of Creep Failure in Dissimilar Weldment Between 9Cr and 2.25Cr Heat-Resistant Steels

  • Hyun Je Sung
  • Ji Hyun Moon
  • Min Ji Jang
  • Hyoung Seop Kim
  • Sung-Joon KimEmail author


Microstructural analysis and the creep failure mechanism of dissimilar weldment between ASTM A213 T92 (9Cr1.5W0.5MoVNbTi) and T22 (2.25Cr1Mo) heat-resistant steels are reported. The low-Cr part that has high carbon activity shows a depletion of C during postweld heat treatment. In particular, the soft carbon-depleted zone (CDZ) with the lowest hardness is surrounded by strong weld metal (WM) and the T22 heat-affected zone (HAZ). Load-displacement curves obtained by nanoindentation experiments are used to extract true stress–strain curves of the WM, the CDZ, and the T22 HAZ by using finite element methods (FEMs). Because of the mechanical properties of each region, the soft CDZ confined between harder regions is exposed to multiaxial stress. Therefore, creep voids actively form and coalesce in this CDZ and lead to macroscopic brittle fracture.



The authors thank the Korea Evaluation Institute of Industrial Technology (Project No. 10048576) for funding and Dr. Tae-Eun Hong, Ms. Mi Rang Byeon, and Ms. Min Ji Kang (Korea Basic Science Institute) for Nano-SIMS analysis.


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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2018

Authors and Affiliations

  • Hyun Je Sung
    • 1
  • Ji Hyun Moon
    • 2
  • Min Ji Jang
    • 2
  • Hyoung Seop Kim
    • 2
  • Sung-Joon Kim
    • 3
    Email author
  1. 1.Technical Research LaboratoriesPOSCOPohangSouth Korea
  2. 2.Department of Materials Science and EngineeringPOSTECHPohangSouth Korea
  3. 3.Graduate Institute of Ferrous TechnologyPOSTECHPohangSouth Korea

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