A novel scheme for weld microstructure control using cryogenic cooling

The total energy input and heat transfer factors influence the after-weld microstructural features and hence properties of the joint. Low heat input has been suggested for fusion welding in order to avoid unfavourable grain morphologies in the welds. Also, the weld cooling cycle is crucial in the...

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Main Authors:	Amuda, Muhammed Olawale Hakeem, Mridha, Shahjahan
Format:	Conference or Workshop Item
Language:	English
Published:	2009
Subjects:	TP Chemical technology
Online Access:	http://irep.iium.edu.my/12692/ http://irep.iium.edu.my/12692/1/ID462_-_a_novel_scheme.pdf

id	iium-12692
recordtype	eprints
spelling	iium-126922011-12-23T05:41:01Z http://irep.iium.edu.my/12692/ A novel scheme for weld microstructure control using cryogenic cooling Amuda, Muhammed Olawale Hakeem Mridha, Shahjahan TP Chemical technology The total energy input and heat transfer factors influence the after-weld microstructural features and hence properties of the joint. Low heat input has been suggested for fusion welding in order to avoid unfavourable grain morphologies in the welds. Also, the weld cooling cycle is crucial in the control of weld microstructures, particularly the time spend above the critical temperature. This is probably controlled by the heat dissipation mechanism in fusion welds from the peak temperature to the ambient condition. However, the influence of the heat transfer factor in terms of the cooling dynamics on the microstructural features and properties of welds have not been well investigated. Additional cooling can assist in the heat dissipation mechanism and hence it can be extremely beneficial to the control of the post-weld microstructure and helps in minimizing the grain growth. In this work, the preliminary result on the effect of cryogenic cooling on grain growth in weld is reported. Ferritic stainless steel, cooled in liquid nitrogen, is welded under TIG torch in argon environment. The weld structure is characterized using LOM, SEM and EDX spectroscopy. The results suggest that cryogenic cooling reduced the weld width within 2% to 5% and HAZ to 39% relative to those cooled in normal condition. This ensures that the area of the base metal affected and exposed to the weld thermal cycle is reduced and hence probably generates less metallurgical distortion. The cryogenic cooling also generated 14% to 36% grain refinement compared to welds cooled in normal condition. 2009 Conference or Workshop Item NonPeerReviewed application/pdf en http://irep.iium.edu.my/12692/1/ID462_-_a_novel_scheme.pdf Amuda, Muhammed Olawale Hakeem and Mridha, Shahjahan (2009) A novel scheme for weld microstructure control using cryogenic cooling. In: The International Conference on the Advanced Materials and Processing Technologies, 26-29 October 2009, The Legend Hotel, Kuala Lumpur.
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	TP Chemical technology
spellingShingle	TP Chemical technology Amuda, Muhammed Olawale Hakeem Mridha, Shahjahan A novel scheme for weld microstructure control using cryogenic cooling
description	The total energy input and heat transfer factors influence the after-weld microstructural features and hence properties of the joint. Low heat input has been suggested for fusion welding in order to avoid unfavourable grain morphologies in the welds. Also, the weld cooling cycle is crucial in the control of weld microstructures, particularly the time spend above the critical temperature. This is probably controlled by the heat dissipation mechanism in fusion welds from the peak temperature to the ambient condition. However, the influence of the heat transfer factor in terms of the cooling dynamics on the microstructural features and properties of welds have not been well investigated. Additional cooling can assist in the heat dissipation mechanism and hence it can be extremely beneficial to the control of the post-weld microstructure and helps in minimizing the grain growth. In this work, the preliminary result on the effect of cryogenic cooling on grain growth in weld is reported. Ferritic stainless steel, cooled in liquid nitrogen, is welded under TIG torch in argon environment. The weld structure is characterized using LOM, SEM and EDX spectroscopy. The results suggest that cryogenic cooling reduced the weld width within 2% to 5% and HAZ to 39% relative to those cooled in normal condition. This ensures that the area of the base metal affected and exposed to the weld thermal cycle is reduced and hence probably generates less metallurgical distortion. The cryogenic cooling also generated 14% to 36% grain refinement compared to welds cooled in normal condition.
format	Conference or Workshop Item
author	Amuda, Muhammed Olawale Hakeem Mridha, Shahjahan
author_facet	Amuda, Muhammed Olawale Hakeem Mridha, Shahjahan
author_sort	Amuda, Muhammed Olawale Hakeem
title	A novel scheme for weld microstructure control using cryogenic cooling
title_short	A novel scheme for weld microstructure control using cryogenic cooling
title_full	A novel scheme for weld microstructure control using cryogenic cooling
title_fullStr	A novel scheme for weld microstructure control using cryogenic cooling
title_full_unstemmed	A novel scheme for weld microstructure control using cryogenic cooling
title_sort	novel scheme for weld microstructure control using cryogenic cooling
publishDate	2009
url	http://irep.iium.edu.my/12692/ http://irep.iium.edu.my/12692/1/ID462_-_a_novel_scheme.pdf
first_indexed	2023-09-18T20:21:50Z
last_indexed	2023-09-18T20:21:50Z
_version_	1777408158469193728

A novel scheme for weld microstructure control using cryogenic cooling

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