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Proceedings of ABM Annual Congress


ISSN 2594-5327

69th ABM International Annual Congress Vol. 69, Num. 69 (2014)


Title

THE EVOLUTION OF INTERNAL VOLUMETRIC DEFECTS IN THE WIRE DRAWING PROCESS OF NiTi

THE EVOLUTION OF INTERNAL VOLUMETRIC DEFECTS IN THE WIRE DRAWING PROCESS OF NiTi

Authorship

DOI

10.5151/1516-392X-24818

Downloads

323 Downloads

Abstract

NiTi shape memory alloys (SMA) have been widely used as construction materials due to their shape memory and superelastic properties. Usually the application of the NiTi alloy is in the wire form, which is ideal shape to make springs, orthodontic arc-wire and endodontic files. Since our research group (ITASMART) started producing NiTi wires, it was noticed that NiTi SMA produced by Vacuum Induction Melting (VIM) presents carbon contamination, which is due to the melting process. Therefore, alloys rich in carbon remove titanium from matrix, forming precipitates of TiC (titanium carbide). Also, Ti2Ni precipitation removes titanium from the matrix and these two precipitates TiC and Ti2Ni can produce internal volumetric defect in the wire drawing process. Seeing the importance of NiTi wires as base of many applications, this work studies the formation of volumetric defects caused by precipitates in the wire drawing process of a NiTi wire drawn down to 0,39 mm in diameter.

 

NiTi shape memory alloys (SMA) have been widely used as construction materials due to their shape memory and superelastic properties. Usually the application of the NiTi alloy is in the wire form, which is ideal shape to make springs, orthodontic arc-wire and endodontic files. Since our research group (ITASMART) started producing NiTi wires, it was noticed that NiTi SMA produced by Vacuum Induction Melting (VIM) presents carbon contamination, which is due to the melting process. Therefore, alloys rich in carbon remove titanium from matrix, forming precipitates of TiC (titanium carbide). Also, Ti2Ni precipitation removes titanium from the matrix and these two precipitates TiC and Ti2Ni can produce internal volumetric defect in the wire drawing process. Seeing the importance of NiTi wires as base of many applications, this work studies the formation of volumetric defects caused by precipitates in the wire drawing process of a NiTi wire drawn down to 0,39 mm in diameter.

Keywords

NiTi SMA; TiC precipitate; Ti2Ni, Wire drawing

NiTi SMA; TiC precipitate; Ti2Ni, Wire drawing

How to cite

André da Silva Antunes; Osmar de Sousa Santos; Odair Doná Rigo; Jorge Otubo. THE EVOLUTION OF INTERNAL VOLUMETRIC DEFECTS IN THE WIRE DRAWING PROCESS OF NiTi, p. 8073-8080. In: 69th ABM International Annual Congress, São Paulo - Brasil, 2014.
ISSN: 2594-5327, DOI 10.5151/1516-392X-24818