Characterisation of hydrogen assisted cracking in modified 9Cr-1Mo steel welds using acoustic emission non destructive technique

This study aims a systematic experimental investigation using acoustic emission (AE) non-destructive technique for online monitoring of hydrogen assisted cracking (HAC) in modified 9Cr-1Mo steel (P91 steel) welds during Gap-Bead on Plate (G-BOP) and implant tests. Welds made without preheating, with...

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Published in:Nondestructive testing and evaluation 2021-11, Vol.36 (6), p.692-708
Main Authors: Haneef, T.K., Chakraborty, Gopa, Rejeesh, R., Mukhopadhyay, C.K., Albert, S. K.
Format: Article
Language:English
Subjects:
Acoustic emission
Chromium molybdenum steels
Crack initiation
Crack propagation
Emission analysis
Environmentally assisted cracking
Frequency analysis
gap-bead on plate test and implant test
Heating
Hydrogen
hydrogen assisted cracking
modified 9Cr-1Mo steel
Monitoring
Nondestructive testing
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cited_by cdi_FETCH-LOGICAL-c338t-26b1558c038f431e879515371844cf9ced6a2fae9602be4d4ef22e5ff321dab63
cites cdi_FETCH-LOGICAL-c338t-26b1558c038f431e879515371844cf9ced6a2fae9602be4d4ef22e5ff321dab63
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container_title Nondestructive testing and evaluation
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creator Haneef, T.K.
Chakraborty, Gopa
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Mukhopadhyay, C.K.
Albert, S. K.
description This study aims a systematic experimental investigation using acoustic emission (AE) non-destructive technique for online monitoring of hydrogen assisted cracking (HAC) in modified 9Cr-1Mo steel (P91 steel) welds during Gap-Bead on Plate (G-BOP) and implant tests. Welds made without preheating, with different preheating and combined pre and post heating were tested using G-BOP test. AE results of G-BOP tests have shown that time duration in which HAC active varies with temperature of preheating and combined pre and post heating. Reduction of AE activity in welds made with pre and post heating compared to those only made with preheating revealed a beneficial effect of the former in reducing HAC. In the case of implant tests, crack initiation and propagation are identified for different applied loads from the AE analysis. An attempt has been made to compare HAC during G-BOP tests and implant tests using AE frequency analysis. The dominant frequency of AE signals characteristic of HAC has been identified. This study shows the potential of using AE frequency analysis for online monitoring of hydrogen assisted cracking (HAC) in welds.
doi_str_mv 10.1080/10589759.2021.1889547
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source Taylor and Francis:Jisc Collections:Taylor and Francis Read and Publish Agreement 2024-2025:Science and Technology Collection (Reading list)
subjects Acoustic emission
Chromium molybdenum steels
Crack initiation
Crack propagation
Emission analysis
Environmentally assisted cracking
Frequency analysis
gap-bead on plate test and implant test
Heating
Hydrogen
hydrogen assisted cracking
modified 9Cr-1Mo steel
Monitoring
Nondestructive testing
title Characterisation of hydrogen assisted cracking in modified 9Cr-1Mo steel welds using acoustic emission non destructive technique
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