Vacuum induction melting of NiTi shape memory alloys in graphite crucible

Niraj, N and Govind, - and Saikrishna, CN and Ramaiah, KV and Bhaumik, SK and Nair, KS and Mittal, MC (2007) Vacuum induction melting of NiTi shape memory alloys in graphite crucible. Materials Science and Engineering: A, 465 (1-2). pp. 44-48.

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Abstract

Vacuum induction melting (VIM) is the most widely used process for the commercial production of NiTi alloys. But, the major drawback in VIM is the carbon contamination of the ingot from the graphite crucible. During melting, carbon reacts with Ti and forms TiC. This alters the Ni/Ti ratio in the alloy and thereby changes the transformation temperatures drastically. Also, the TiC particles in the matrix hinder the workability of the alloy as well as the memory properties of the products. The present experimental study deals with the VIM of NiTi alloys melted in graphite crucible wherein it has been shown that the carbon pick up in the melt can be reduced significantly when Ni and Ti are placed in the graphite crucible by a novel method of charging. The cast ingots (weighing 7x2013;8 kg each) were subjected to various secondary metal processing operations viz., forging, rolling and wire drawing. The properties of the wire products were evaluated.

Item Type: Journal Article
Uncontrolled Keywords: NiTi alloys;Vacuum induction melting;Graphite crucible;Carbon contamination;Mechanical and functional properties
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Division/Department: Other, Other, Materials Science Division, Materials Science Division, Materials Science Division, Other, Other
Depositing User: Ms. Alphones Mary
Date Deposited: 27 May 2009
Last Modified: 24 May 2010 09:56
URI: http://nal-ir.nal.res.in/id/eprint/5125

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