Room Temperature Creep Behavior of Ti-6Al-4V Alloy

doi:10.11901/1005.3093.2021.151

Chinese Journal of Materials Research

2021, Vol. 35

Issue (12): 881-892 DOI: 10.11901/1005.3093.2021.151

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Room Temperature Creep Behavior of Ti-6Al-4V Alloy

XI Guoqiang¹^,², QIU Jianke¹^,²^,³(

), LEI Jiafeng¹^,²^,³(

), MA Yingjie¹^,²^,³, YANG Rui¹^,²^,³

^1.Shi -Changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^2.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
^3.Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519000, China

Cite this article:

XI Guoqiang, QIU Jianke, LEI Jiafeng, MA Yingjie, YANG Rui. Room Temperature Creep Behavior of Ti-6Al-4V Alloy. Chinese Journal of Materials Research, 2021, 35(12): 881-892.

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Abstract

The room temperature creep behavior of Ti-6Al-4V alloy and its effect on subsequent mechanical properties were investigated. The results show that all these factors, such as macro-texture, creep stress level and pre-plastic-strain, have a significant impact on the room temperature creep behavior of Ti-6Al-4V. With the increase of the <0001> peak pole density along the loading direction, the work hardening exponent increases, and the creep exponent becomes smaller, resulting in the better room temperature creep property of Ti-6Al-4V. Enough high stress is the prerequisite for room temperature creep. The obvious room temperature creep behavior can be observed only when the creep stress is not lower than 0.85σ_y, and the room temperature strain increases with the creep stress level. Pre-plastic-strain can suppress the subsequent room temperature creep of Ti-6Al-4V, no matter the pre-plastic-strain comes from the monotonic loading or from the creep behavior. The pre-plastic-strain can deteriorate the fatigue property of the alloy, although it can reduce subsequent creep strain.

Key words: metallic materials titanium alloy Ti-6Al-4V room temperature creep macrotexture pre-plastic-strain mechanical properties

Received: 26 February 2021

ZTFLH:

TG146.2+3

Fund: National Natural Science Foundation of China(51701219);National Key R & D Program of China(2016YFC0300600);Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai)(311021013)

About author: QIU Jianke, Tel: (024)83970131, E-mail: jkqiu@imr.ac.cn
LEI Jiafeng, Tel: (024)23971958, E-mail: jflei@imr.ac.cn;

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	Guoqiang XI
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https://www.cjmr.org/EN/10.11901/1005.3093.2021.151 OR https://www.cjmr.org/EN/Y2021/V35/I12/881

Fig.1 Size of specimens (a) and sampling diagram (b) (unit: mm)

Table 1 Compressive properties of the rolled Ti-6Al-4V plate (the number of parallel samples is 2)

Fig.2 Test waveforms of normal creep (a) and dwell fatigue (b)

Fig.3 Microstructures of the rolled Ti-6Al-4V plate at (a) 0H, 0.25H (b) and 0.5H (c)

Fig.4 (0001) pole figures of the rolled Ti-6Al-4V plate at 0H (a), 0.25H (b) and 0.5H (c)

Fig.5 Compressive stress-strain curves of the rolled Ti-6Al-4V plate at room temperature (a) true stress versus true strain and (b) true stress versus true plastic strain

Fig. 6 Compressive creep behavior of the rolled Ti-6Al-4V plate at creep stress of 0.95σ_y at room temperature (a) creep strain versus creep time and (b) creep strain rate versus creep time

Table 2 Fitting results of creep parameters during room temperature compressive creep of the rolled Ti-6Al-4V plate (the number of parallel samples is 2)

Fig.7 Relationships between material constants and <0001> peak pole density (a) and relationship between work hardening exponent n and creep exponent b (b)

Fig.8 Accumulation of plastic strain ε_p in the rolled Ti-6Al-4V plate during normal compressive creep and compressive dwell fatigue when σ_max is 0.95σ_y at room temperature

Table 3 Fitting results of creep parameters during room temperature compressive dwell fatigue of the rolled Ti-6Al-4V plate (the number of parallel samples is 2)

Fig. 9 Design of load-step-increasing creep experiment and the changes of creep strain with time under different stress levels in load-step-increasing creep experiment of the rolled Ti-6Al-4V plate at room temperature (a) loading diagram and (b) strain-stress curve of load-step-increasing creep experiment, (c) creep curves under different stress levels in one tensile load-step-increasing creep experiment, (d) creep curves under different stress levels in one compressive load-step-increasing creep experiment

Fig. 10 Effect of pre-plastic-strain on room temperature creep properties of the rolled Ti-6Al-4V plate (a) loading diagram of the load-step-decreasing creep experiment (in the red circle), (b) creep curves under different stress levels in one tensile load-step-decreasing creep experiment, (c) the effect of once existed high stress on creep, (d) the effect of pre-plastic-strain on creep

Fig.11 Typical strain-stress curves of Creep+HCF (a) and Tension+HCF (b)

Table 4 Effect of pre-plastic-strain on fatigue property of the rolled Ti-6Al-4V plate (R=0, f=10 Hz, triangular waveform, tensile stress)

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