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Metals 2017, 7(6), 200; doi:10.3390/met7060200

The Effect of Initial Structure on Phase Transformation in Continuous Heating of a TA15 Titanium Alloy

State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China
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Academic Editor: Mark T. Whittaker
Received: 20 April 2017 / Revised: 18 May 2017 / Accepted: 23 May 2017 / Published: 1 June 2017
(This article belongs to the Special Issue Titanium Alloys 2017)
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Abstract

The effect of initial structure on phase evolution in continuous heating of a near-α TA15 titanium alloy (Ti-6Al-2Zr-1Mo-1V) was experimentally investigated. To this end; three microstructures were obtained by multiple heat treatment: I-bimodal structure with 50% equaixed α, II-bimodal structure with 15% equiaxed α, III-trimodal structure with 18% equiaxed α and 25% lamellar α. Differential scanning calorimetry (DSC), dilatometry and quantitative metallography were carried out on specimens with the three initial structures at heating rates from 5 to 40 °C/min. The transformation kinetics was modeled with the Johnson–Mehl–Avrami (JMA) approach under non-isothermal condition. It was found that there exists a four-stage transformation for microstructures I and III. The secondary and third stages overlap for microstructure II. The four stages of phase transformation overlap with increasing heating rate. In the presence of α laths, the phase transformation kinetics is affected by the composition difference between lamellar α and primary equiaxed α. Phase transformation is controlled by the growth of existing large β phase. View Full-Text
Keywords: titanium alloy; phase transformation; microstructure; DSC; dilatometry titanium alloy; phase transformation; microstructure; DSC; dilatometry
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Fan, X.; Li, Q.; Zhao, A.; Shi, Y.; Mei, W. The Effect of Initial Structure on Phase Transformation in Continuous Heating of a TA15 Titanium Alloy. Metals 2017, 7, 200.

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