High Temperature Mechanical Constitutive Modeling of a High-Nb TiAl Alloy

DONG Chengli; YU Huichen; JIAO Zehui; KONG Fantao; CHEN Yuyong

doi:10.11868/j.issn.1005-5053.2017.000070

Journal of Aeronautical Materials (Feb 2018)

High Temperature Mechanical Constitutive Modeling of a High-Nb TiAl Alloy

DONG Chengli,
YU Huichen,
JIAO Zehui,
KONG Fantao,
CHEN Yuyong

Affiliations

DONG Chengli: Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China
YU Huichen: Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China
JIAO Zehui: Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China
KONG Fantao: School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
CHEN Yuyong: School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

DOI: https://doi.org/10.11868/j.issn.1005-5053.2017.000070
Journal volume & issue: Vol. 38, no. 1
pp. 80 – 87

Abstract

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Uniaxial tensile, low cycle fatigue, fatigue-creep interaction and creep experiments of a novel high-Nb TiAl alloy (i.e. Ti-45Al-8Nb-0.2W-0.2B-0.02Y (atom fraction/%)) were conducted at 750℃ to obtain its tested data and curves. Based on Chaboche visco-plasticity unified constitutive model, Ohno-Wang modified non-linear kinematic hardening was introduced in Chaboche constitutive model to describe the cyclic hardening/softening, and Kachanov damage was coupled in Chaboche constitutive model to characterize the accelerated creep stage. The differential equations of the constitutive model discretized by explicit Euler method were compiled in to ABAQUS/UMAT to simulate the mechanical behavior of high-Nb TiAl alloy at different test conditions. The results show that Chaboche visco-plasticity unified constitutive model considering both Ohno-Wang modified non-linear kinematic hardening and Kachanov damage is able to simulate the uniaxial tensile, low cycle fatigue, fatigue-creep interaction and creep behavior of high-Nb TiAl alloy and has high accuracy.

Published in Journal of Aeronautical Materials

ISSN: 1005-5053 (Print)
Publisher: Journal of Aeronautical Materials
Country of publisher: China
LCC subjects: Technology: Motor vehicles. Aeronautics. Astronautics
Website: http://jam.biam.ac.cn/indexen.htm

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