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

被引：3

作者：

Sung, Hyun Je ^{[1
]}

Moon, Ji Hyun ^{[2
]}

Jang, Min Ji ^{[2
]}

Kim, Hyoung Seop ^{[2
]}

Kim, Sung-Joon ^{[3
]}

机构：

[1] POSCO, Tech Res Labs, Pohang 37859, South Korea

[2] POSTECH, Dept Mat Sci & Engn, Pohang 37673, South Korea

[3] POSTECH, Grad Inst Ferrous Technol, Pohang 37673, South Korea

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2018年 / 49A卷 / 11期

关键词：

CRACKING;

D O I：

10.1007/s11661-018-4859-x

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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

引用

页码：5323 / 5332

页数：10

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