A Two-Step Heat Treatment to Eliminate the Micro-Segregation of Ti–45Al–8.5Nb–0.2W–0.2B–0.02Y Alloy

Yan Zhang; Hongchao Kou; Guang Yang; Bin Tang; Xiangyi Xue; Jinshan Li

doi:10.1002/adem.201600004

A Two-Step Heat Treatment to Eliminate the Micro-Segregation of Ti–45Al–8.5Nb–0.2W–0.2B–0.02Y Alloy

Yan Zhang, Hongchao Kou, Guang Yang, Bin Tang, Xiangyi Xue, Jinshan Li

School of Materials Sience and Engineering

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

Micro-segregation in high Nb-containing TiAl alloys usually causes the inhomogeneous of microstructure and the initiation of microcracks. In this paper, a novel two-step heat treatment (HT) approach is proposed based on the phase transformation sequence to remove the micro-segregation. In the first step, Ti–45Al–8.5Nb–0.2W–0.2B–0.02Y alloy is annealed in 1470 °C for 30 min to eliminate the solidification segregation and reduce the stability of β phase. The alloy is then cooled to 1340 °C, slightly above the α + β transus (T_{α + β}) for about 60 min in order to remove the β-segregation. Results show that the homogeneity of the lamellar colony is improved after the two-step HT.

Original language	English
Pages (from-to)	1267-1272
Number of pages	6
Journal	Advanced Engineering Materials
Volume	18
Issue number	7
DOIs	https://doi.org/10.1002/adem.201600004
State	Published - 1 Jul 2016

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title = "A Two-Step Heat Treatment to Eliminate the Micro-Segregation of Ti–45Al–8.5Nb–0.2W–0.2B–0.02Y Alloy",

abstract = "Micro-segregation in high Nb-containing TiAl alloys usually causes the inhomogeneous of microstructure and the initiation of microcracks. In this paper, a novel two-step heat treatment (HT) approach is proposed based on the phase transformation sequence to remove the micro-segregation. In the first step, Ti–45Al–8.5Nb–0.2W–0.2B–0.02Y alloy is annealed in 1470 °C for 30 min to eliminate the solidification segregation and reduce the stability of β phase. The alloy is then cooled to 1340 °C, slightly above the α + β transus (Tα + β) for about 60 min in order to remove the β-segregation. Results show that the homogeneity of the lamellar colony is improved after the two-step HT.",

author = "Yan Zhang and Hongchao Kou and Guang Yang and Bin Tang and Xiangyi Xue and Jinshan Li",

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T1 - A Two-Step Heat Treatment to Eliminate the Micro-Segregation of Ti–45Al–8.5Nb–0.2W–0.2B–0.02Y Alloy

AU - Zhang, Yan

AU - Kou, Hongchao

AU - Yang, Guang

AU - Tang, Bin

AU - Xue, Xiangyi

AU - Li, Jinshan

PY - 2016/7/1

Y1 - 2016/7/1

N2 - Micro-segregation in high Nb-containing TiAl alloys usually causes the inhomogeneous of microstructure and the initiation of microcracks. In this paper, a novel two-step heat treatment (HT) approach is proposed based on the phase transformation sequence to remove the micro-segregation. In the first step, Ti–45Al–8.5Nb–0.2W–0.2B–0.02Y alloy is annealed in 1470 °C for 30 min to eliminate the solidification segregation and reduce the stability of β phase. The alloy is then cooled to 1340 °C, slightly above the α + β transus (Tα + β) for about 60 min in order to remove the β-segregation. Results show that the homogeneity of the lamellar colony is improved after the two-step HT.

AB - Micro-segregation in high Nb-containing TiAl alloys usually causes the inhomogeneous of microstructure and the initiation of microcracks. In this paper, a novel two-step heat treatment (HT) approach is proposed based on the phase transformation sequence to remove the micro-segregation. In the first step, Ti–45Al–8.5Nb–0.2W–0.2B–0.02Y alloy is annealed in 1470 °C for 30 min to eliminate the solidification segregation and reduce the stability of β phase. The alloy is then cooled to 1340 °C, slightly above the α + β transus (Tα + β) for about 60 min in order to remove the β-segregation. Results show that the homogeneity of the lamellar colony is improved after the two-step HT.

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A Two-Step Heat Treatment to Eliminate the Micro-Segregation of Ti–45Al–8.5Nb–0.2W–0.2B–0.02Y Alloy

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