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Physics of Metals and Metallography
Published in: Physics of Metals and Metallography 7/2019

01-07-2019 | STRUCTURE, PHASE TRANSFORMATIONS, AND DIFFUSION

Evolution of Microstructure during Welding Simulation of Boron Modified P91 Steel

Authors: Modassir Akhtar, Akhil Khajuria, V. S. Kumar, R. K. Gupta, Shaju K. Albert

Published in: Physics of Metals and Metallography | Issue 7/2019

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Abstract

Formation of heat affected zone (HAZ) when welding is considered as weakest link across transition joint. Characterization of this zone is a key issue to reduce the effect of embrittlement; hence appropriate welding parameters were adopted. In the present study, HAZ simulation was done for boron modified P91 steel using Gleeble. It has been observed that matrix was martensitic in nature for coarse-grain HAZ (CGHAZ)/fine-grain HAZ (FGHAZ) whereas for inter-critical HAZ (ICHAZ), matrix was ferrite + martensite containing primary carbides. The size and fraction of carbides varied with peak temperature. Presence of boron influenced the microstructural characteristics of different zones by influencing precipitation nature and fractional characteristic of phases. Substantial variation in hardness was obtained before and after post-weld heat treatment (PWHT). In this respect, simulated samples exhibited maximum hardness at CGHAZ and after PWHT the same region showed minimum hardness. Short-term impression creep testing of simulated sub-HAZs was done, which revealed embrittling effect in ICHAZ, whereas embrittlement shifted to CGHAZ after PWHT. Based on conventional nomenclature for weldment failures, it is confirmed that PWHT shifted type-IV failure (ICHAZ) to type-III failure (CGHAZ) in boron modified P91 steel.
previous article Effect of Chemical Bonding on the Thermal Stability of Cu–Zr-Rich Cu–Zr–Al Bulk Metallic Glasses
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Metadata
Title
Evolution of Microstructure during Welding Simulation of Boron Modified P91 Steel
Authors
Modassir Akhtar
Akhil Khajuria
V. S. Kumar
R. K. Gupta
Shaju K. Albert
Publication date
01-07-2019
Publisher
Pleiades Publishing
Published in
Physics of Metals and Metallography / Issue 7/2019
Print ISSN: 0031-918X
Electronic ISSN: 1555-6190
DOI
https://doi.org/10.1134/S0031918X19070056

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