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Columnar grain development in C-Mn-Ni low-alloy weld metals and the influence of nickel

Columnar grain development in C-Mn-Ni low-alloy weld metals and the influence of nickel
Columnar grain development in C-Mn-Ni low-alloy weld metals and the influence of nickel
This paper discusses the development of columnar grains in as-deposited C-Mn-Ni(-Mo) low-carbon low-alloy weld metals and the influence of the alloying elements, particularly nickel. It was found that the austenite columnar grain size prior to the ?-? transformation of the weld metals was mainly controlled by the alloying contents rather than HAZ grains adjacent to the fusion boundaries, although the latter determined the size of the initial columnar grain size. The addition of nickel initially depressed the prior austenite grain size and subsequently dramatically coarsened it. This was related to the nickel equivalent (Nieq) of the weld metals and the peritectic reaction during the solidification process. Small columnar grains were associated with a Nieq between 3.4 and 6.2% which resulted in a peritectic reaction when the weld melt solidified, whilst a Nieq higher than 6.2% produced very large columnar grains because the weld pool would directly solidify into austenite and have a subsequent continuous growth.
0022-2461
5581-5588
Zhang, Zhuyao
57337345-6da7-403b-b73d-2c3a57056c8b
Farrar, R.A.
1147a2de-e1ac-4dea-80a3-099983fc8ba9
Zhang, Zhuyao
57337345-6da7-403b-b73d-2c3a57056c8b
Farrar, R.A.
1147a2de-e1ac-4dea-80a3-099983fc8ba9

Zhang, Zhuyao and Farrar, R.A. (1995) Columnar grain development in C-Mn-Ni low-alloy weld metals and the influence of nickel. Journal of Materials Science, 30 (22), 5581-5588. (doi:10.1007/BF00356690).

Record type: Article

Abstract

This paper discusses the development of columnar grains in as-deposited C-Mn-Ni(-Mo) low-carbon low-alloy weld metals and the influence of the alloying elements, particularly nickel. It was found that the austenite columnar grain size prior to the ?-? transformation of the weld metals was mainly controlled by the alloying contents rather than HAZ grains adjacent to the fusion boundaries, although the latter determined the size of the initial columnar grain size. The addition of nickel initially depressed the prior austenite grain size and subsequently dramatically coarsened it. This was related to the nickel equivalent (Nieq) of the weld metals and the peritectic reaction during the solidification process. Small columnar grains were associated with a Nieq between 3.4 and 6.2% which resulted in a peritectic reaction when the weld melt solidified, whilst a Nieq higher than 6.2% produced very large columnar grains because the weld pool would directly solidify into austenite and have a subsequent continuous growth.

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Published date: 1995

Identifiers

Local EPrints ID: 21131
URI: http://eprints.soton.ac.uk/id/eprint/21131
ISSN: 0022-2461
PURE UUID: ba100731-a028-43fe-a52e-d18dfd12ff46

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Date deposited: 06 Nov 2006
Last modified: 15 Mar 2024 06:28

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Contributors

Author: Zhuyao Zhang
Author: R.A. Farrar

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