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Metallography, Microstructure, and Analysis
Published in: Metallography, Microstructure, and Analysis 5/2018

10-08-2018 | Review

Improving the Weld Procedure for Aged HP-Mod Alloy Reformer Tubes

Authors: Kiran Rampat, Chris Maharaj

Published in: Metallography, Microstructure, and Analysis | Issue 5/2018

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Abstract

Welding of service-exposed, aged heat-resistant nickel-base alloys is notoriously difficult. There is a high propensity for cracking in the heat-affected zone (HAZ) of the weld which manifests during or immediately after the welding process due to creep induced embrittlement. The cracks due to creep induced embrittlement are typically accelerated by high residual stresses. To minimize this damage mechanism, the original weld procedure was modified from a double-angle V-groove to a U-groove, and a stringer pattern was used instead of weaving at a higher interpass temperature. Welds were prepared and tested using the modified procedure which was beneficial in minimizing the occurrence of fissures and subsequent cracking due to creep induced embrittlement. Comparative hardness testing of the original and modified weld procedures’ revealed a reduced HAZ width with the modified procedure that most likely facilitated the minimization of creep induced embrittlement.
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Metadata
Title
Improving the Weld Procedure for Aged HP-Mod Alloy Reformer Tubes
Authors
Kiran Rampat
Chris Maharaj
Publication date
10-08-2018
Publisher
Springer US
Published in
Metallography, Microstructure, and Analysis / Issue 5/2018
Print ISSN: 2192-9262
Electronic ISSN: 2192-9270
DOI
https://doi.org/10.1007/s13632-018-0469-7

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