Post weld heat treatment of bisalloy 80 steel: Mechanics and industry safety code compatibility

Alipooramirabad, Houman and Paradowska, Anna and Reid, Mark and Ghomashchi, Reza (2025) Post weld heat treatment of bisalloy 80 steel: Mechanics and industry safety code compatibility. International Journal of Pressure Vessels and Piping, 214. p. 105434. ISSN 0308-0161

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Abstract

The present study utilized both in-situ and ex-situ neutron diffraction to evaluate the evolution of residual strains/stresses before, during and after Post-Weld Heat Treatment (PWHT) of quenched and tempered (Q&T) Bisalloy 80 steel welded by pulsed Gas Metal Arc Welding (GMAW-P). It was found that strain/stress relaxation mainly occurred during the reheating step with a high relaxation rate and steep slope (∼67 % of strain relaxation) while linear strain relief was observed during holding (soaking) time. Most of the strain relief occurred within the temperature range of 450°C–600 °C which is believed to be due to creep strain development occurring far earlier than the component reaching the isothermal holding temperature. The ex-situ neutron diffraction measurements were similar to in-situ results confirming the applied PWHT effectively mitigated the residual stresses (the maximum longitudinal stress reduced to around 23 % of the weld metal yield strength).
The measurements were compared with existing literature data and the current fitness of safety assessment codes (BS7910 and R6). It was found that both assessment codes were conservative for both the transverse and longitudinal residual stresses in the region close to the weld toe. Furthermore, both standards may underestimate through-thickness residual stresses in the transverse direction.

Item Type:	Article
Identification Number:	10.1016/j.ijpvp.2025.105434
Dates:	Date Event 5 January 2025 Accepted 7 January 2025 Published Online
Subjects:	CAH10 - engineering and technology > CAH10-01 - engineering > CAH10-01-02 - mechanical engineering
Divisions:	Faculty of Computing, Engineering and the Built Environment > College of Engineering
Depositing User:	Gemma Tonks
Date Deposited:	13 Jan 2025 14:38
Last Modified:	13 Jan 2025 14:38
URI:	https://www.open-access.bcu.ac.uk/id/eprint/16073

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