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

IF 3.1 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Journal of Iron and Steel Research(International) Pub Date : 2017-08-01 DOI:10.1016/S1006-706X(17)30121-8
Hang-wei Zhou , Hui-qun Liu , Dan-qing Yi , Yu Xiao , Xiao-long Zhao , Jian Wang , Qi Gao
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引用次数: 5

Abstract

Fatigue crack growth as a function of a 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 a 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 a grain microstructure treated at high solid solution temperature and slow cooling rate have lower fatigue crack growth rate. The appearance of secondary a 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 a grain microstructure, owing to the change of fatigue crack growth mechanism.

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α相对Ti-6242合金疲劳裂纹扩展的影响
采用疲劳试验、光学显微镜、扫描电镜和透射电镜研究了Ti-6Al-2Sn-4Zr-2Mo (Ti-6242)合金疲劳裂纹扩展与相体积分数的关系。对Ti-6242合金进行不同固溶温度和冷却速率的α+β退火处理,形成具有不同a相特征的微观组织,并对微观组织进行详细表征,探讨疲劳裂纹扩展机理。结果表明:Ti-6242合金的疲劳裂纹扩展速率随着初生α相(αp)体积分数的减小而减小;采用高固溶温度和慢冷却速度处理的大晶粒组织试样具有较低的疲劳裂纹扩展速率。随着固溶温度的升高,次级a相(αs)的出现导致了裂纹的偏转。此外,由于疲劳裂纹扩展机制的改变,在αp含量为29.8%(典型双峰组织)、大晶粒组织的Ti-6242合金的Paris区出现了疲劳裂纹扩展转变现象。
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来源期刊
CiteScore
4.30
自引率
0.00%
发文量
2879
审稿时长
3.0 months
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