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Effect of heat treatment on microstructure and mechanical properties of cast and directionally solidified high-Nb contained TiAl-based alloys

Published online by Cambridge University Press:  22 October 2015

Shulin Dong ,
Ruirun Chen ,
Jingjie Guo ,
Hongsheng Ding ,
Yanqing Su  and
Hengzhi Fu
Shulin Dong
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China
Ruirun Chen*
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China
Jingjie Guo
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China
Hongsheng Ding
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China
Yanqing Su
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China
Hengzhi Fu
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China
*
a) Address all correspondence to this author. e-mail: ruirunchen@hit.edu.cn
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Abstract

Two kinds of heavy-alloying β-type TiAl-based alloys Ti44Al6Nb1.0Cr2.0V (A1) and Ti44Al6Nb1.0Cr2.0V0.15Y0.1B (A2) are newly designed. They are prepared by vacuum consumable melting (VCM) and cold crucible directional solidification (CCDS). Via the theoretical analysis and tentative experiment, five alternative heat treatment (HT) schedules are proposed and studied that the corresponding microstructure and room temperature (RT) tensile property are investigated, and finally the optimized HT schedules are acquired. After HT5 (heat preservation in β phase region and at 1290 °C, and then ladder cooling), A2 alloy cast by VCM exhibits a better tensile property with average elongation of 1.20%. For the two CCDS ingots, after HT3 (mainly annealing at 1280 °C), B2 phase and (B2 + γ) blocky morphology are reduced, the columnar grains and small angle lamellas are reserved, and the tensile property also has a moderate improvement.

Keywords

titanium aluminumheat treatmenttensile propertydirectional solidificationmicrostructure

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Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 21 , 13 November 2015 , pp. 3331 - 3342
Copyright
Copyright © Materials Research Society 2015 

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Footnotes

Contributing Editor: Yang-T. Cheng

References

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