Phase-field simulation of fusion interface events during solidification of dissimilar welds: effect of composition inhomogeneity

Chatterjee, Subhradeep ; Abinandanan, T. A. ; Chattopadhyay, Kamanio (2008) Phase-field simulation of fusion interface events during solidification of dissimilar welds: effect of composition inhomogeneity Metallurgical and Materials Transactions A, 39 (7). pp. 1638-1646. ISSN 1073-5623

[img]
Preview
PDF - Publisher Version
629kB

Official URL: http://www.springerlink.com/content/7035433pt61187...

Related URL: http://dx.doi.org/10.1007/s11661-007-9340-1

Abstract

We investigate the events near the fusion interfaces of dissimilar welds using a phase-field model developed for single-phase solidification of binary alloys. The parameters used here correspond to the dissimilar welding of a Ni/Cu couple. The events at the Ni and the Cu interface are very different, which illustrate the importance of the phase diagram through the slope of the liquidus curves. In the Ni side, where the liquidus temperature decreases with increasing alloying, solutal melting of the base metal takes place; the resolidification, with continuously increasing solid composition, is very sluggish until the interface encounters a homogeneous melt composition. The growth difficulty of the base metal increases with increasing initial melt composition, which is equivalent to a steeper slope of the liquidus curve. In the Cu side, the initial conditions result in a deeply undercooled melt and contributions from both constrained and unconstrained modes of growth are observed. The simulations bring out the possibility of nucleation of a concentrated solid phase from the melt, and a secondary melting of the substrate due to the associated recalescence event. The results for the Ni and Cu interfaces can be used to understand more complex dissimilar weld interfaces involving multiphase solidification.

Item Type:Article
Source:Copyright of this article belongs to Springer-Verlag.
ID Code:6547
Deposited On:21 Oct 2010 04:33
Last Modified:16 May 2016 16:52

Repository Staff Only: item control page