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

Title
Microstructural and Finite Element Analysis of Creep Failure in Dissimilar Weldment Between 9Cr and 2.25Cr Heat-Resistant Steels
Authors
Sung, Hyun JeMoon, Ji HyunJang, Min JiKim, Hyoung SeopKim, Sung-Joon
POSTECH Authors
Kim, Hyoung SeopKim, Sung-Joon
Date Issued
Nov-2018
Publisher
SPRINGER
Abstract
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. (C) The Minerals, Metals & Materials Society and ASM International 2018
URI
http://oasis.postech.ac.kr/handle/2014.oak/94940
DOI
10.1007/s11661-018-4859-x
ISSN
1073-5623
Article Type
Article
Citation
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, vol. 49A, no. 11, page. 5323 - 5332, 2018-11
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 KIM, SUNG JOON
Graduate Institute of Ferrous Technology
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