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Effect of α phase on fatigue crack growth of Ti-6242 alloy

2017-08-03 JISRI 钢铁研究学报 钢铁研究学报


J. Iron Steel Res. Int. 24 (2017) No. 8, 811-822


Effect of α phase on fatigue crack growth of Ti-6242 alloy


Hang-wei Zhou1,2, Hui-qun Liu1,2,*, Dan-qing Yi1,2, Yu Xiao1,2, Xiao-long Zhao3, Jian Wang3,  Qi Gao3

1 School of Materials Science and Engineering, Central South University, Changsha 410083, Hunan, China

2 Key Laboratory of Nonferrous Materials, Ministry of Education, Central South University, Changsha 410083, Hunan, China

3 BAOTI Group Ltd., Baoji 721014, Shanxi, China

ABSTRACT: Fatigue crack growth as a function of α phase volume fraction in Ti-6Al-2Sn-4Zr-2Mo (Ti-6242) alloy was investigated using fatigue testing, optical microscopy, scanning electron microscopy, and transmission electron microscopy. The α+β annealing treatments with different solid solution temperatures and cooling rates were conducted in order to tailor microstructure with different α phase features in the Ti-6242 alloy, and fatigue crack growth mechanism was discussed after detailed microstructure characterization. The results showed that fatigue crack growth rate of Ti-6242 alloy decreased with the decrease in volume fraction of the primary α phase (αp). Samples with a large-sized α grain microstructure treated at high solid solution temperature and slow cooling rate have lower fatigue crack growth rate. The appearance of secondary α phase (αs) with the increase of solid solution temperature led to crack deflection. Moreover, a fatigue crack growth transition phenomenon was observed in the Paris regime of Ti-6242 alloy with 29.8% αp (typical bi-modal microstructure) and large-sized α grain microstructure, owing to the change of fatigue crack growth mechanism.

Key wordsTi-6242 alloy; Microstructure tailoring; Fatigue crack growth; α phase; Fatigue crack growth rate; Crack propagation transition

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J Iron Steel Res Int

创刊:1994年,月刊

主编:田志凌 教授

收录:SCI、EI

影响因子:0.836(SCI,2016)

钢铁研究学报

创刊:1981年,月刊

主编:干勇 院士

收录:中文核心

影响因子:0.763(中文核心,2015)

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冶金工业节能环保、冶金资源综合利用、炼铁、炼钢、连铸、铸造、凝固、锻压、轧制及后续热处理、冶金物理化学、钢铁冶金新工艺等。

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