The Segregation of Chemical Composition in NiTi Shape Memory Alloy Melted by VIM in Lime Crucible

Abstract:

Article Preview

Binary NiTi shape memory alloy cast ingots with large scale size are produced by using vacuum induction melting (VIM) in lime crucible, the oxygen and carbon contents are less than 500ppm. Usually, oxygen was introduced into the melts by the dissolution of lime during melting, resulting in higher content of oxygen over 500ppm. VAR + VIM ingot metallurgy is prone to produce materials with a good chemical homogeneity. However, it is difficult for one single melting of NiTi by VIM in the lime crucible. So in the present paper, the segregation of chemical composition and the consistency of transformation temperature in NiTi alloys in as-casted condition along the cross-section area on edge and center, in homogeneization-treated condition, and in as-forged condition along the longitudinal-section area on head and tail, are measured and analyzed by differential scanning calorimetry (DSC), OM, SEM, and XRD, to indicate the chemical homogeneity in microscopic and macroscopic scale.

Info:

Periodical:

Materials Science Forum (Volumes 610-613)

Main Theme:

Edited by:

Zhong Wei Gu, Yafang Han, Fu Sheng Pan, Xitao Wang, Duan Weng and Shaoxiong Zhou

Pages:

1315-1318

DOI:

10.4028/www.scientific.net/MSF.610-613.1315

Citation:

Z. S. Yuan et al., "The Segregation of Chemical Composition in NiTi Shape Memory Alloy Melted by VIM in Lime Crucible", Materials Science Forum, Vols. 610-613, pp. 1315-1318, 2009

Online since:

January 2009

Export:

Price:

$35.00

In order to see related information, you need to Login.

In order to see related information, you need to Login.