Effect of grain size on high-temperature stress relaxation behavior of fine-grained TC4 titanium alloy

2020 ◽  
Vol 30 (3) ◽  
pp. 668-677 ◽  
Author(s):  
He-li PENG ◽  
Xi-feng LI ◽  
Xu CHEN ◽  
Jun JIANG ◽  
Jing-feng LUO ◽  
...  
Keyword(s):  
Grain Size ◽  
Titanium Alloy ◽  
High Temperature ◽  
Stress Relaxation ◽  
Temperature Stress ◽  
High Temperature Stress ◽  
Relaxation Behavior ◽  
Stress Relaxation Behavior ◽  
Fine Grained ◽  
Tc4 Titanium Alloy

Reloading Stress Relaxation Behavior Analysis Based on a Creep Model for High Temperature Bolting Steel

2013 ◽  
Vol 328 ◽  
pp. 950-954
Author(s):  
Wei Wei Zhang ◽  
Hong Xu ◽  
Hong Yuan Li
Keyword(s):  
High Temperature ◽  
Stress Relaxation ◽  
Steady State Creep ◽  
Relaxation Behavior ◽  
Creep Model ◽  
National Research Institute ◽  
Time Intervals ◽  
Stress Relaxation Behavior ◽  
Proposed Model ◽  
Good Agreement

An analytical method based on a creep model is being developed to investigate the effect of retightening on stress relaxation behavior for high-temperature turbine and valve studs/bolts. In order to validate the approach, the calculated results are compared to the results of uniaxial reloading stress relaxation testing, which were performed by the National Research Institute for Metals of Japan (NRIM) for 12Cr-1Mo-1W-1/4V stainless steel bolting material at 550°C. It was shown that the proposed model based on Altenbach-Gorash-Naumenko creep model for the primary and steady state creep could be applied for the present data. The calculated residual stresses versus time curves were in good agreement with the measured for initial stress level of 273.6MPa at 550°C and for specific reloading time intervals of 24, 72, 240, and 720 hours.

High temperature stress relaxation in Ti- and Cu-doped reaction bonded Al2O3

2002 ◽  
Vol 22 (14-15) ◽  
pp. 2641-2645 ◽  
Author(s):  
A. Morales-Rodrı́guez ◽  
A. Bravo-León ◽  
M. Jiménez-Melendo ◽  
A. Domı́nguez-Rodrı́guez
Keyword(s):  
High Temperature ◽  
Stress Relaxation ◽  
Temperature Stress ◽  
High Temperature Stress

A Unified Continuum Damage Mechanics Model for Predicting the Stress Relaxation Behavior of High-Temperature Bolting

2013 ◽  
Vol 136 (1) ◽  
Author(s):  
J. Q. Guo ◽  
X. T. Zheng ◽  
Y. Zhang ◽  
H. C. Shi ◽  
W. Z. Meng
Keyword(s):  
Experimental Data ◽  
High Temperature ◽  
Stress Relaxation ◽  
Constitutive Equations ◽  
Damage Mechanics ◽  
Continuum Damage Mechanics ◽  
Relaxation Behavior ◽  
Continuum Damage ◽  
Creep Equation ◽  
Stress Relaxation Behavior

Two stress relaxation constitutive models have been developed to predict the stress relaxation behavior for high-temperature bolting according to continuum damage mechanics, Kachanov–Robatnov (K–R), and Othman–Hayhurst (O–H) creep constitutive equations as well as stress relaxation strain equations. To validate the effectiveness of constitutive equations, the predicted results were compared with the experimental data of uniaxial isothermal stress relaxation tests using 1Cr10NiMoW2VNbN steel. The results show that the results obtained by the stress relaxation constitutive model based on the K–R creep equation overestimates the stress relaxation behavior, while the model deduced by the O–H creep equation is more in agreement with the experimental data. Moreover, the stress relaxation damage predicted increases with the increment of initial stress significantly. These indicate that the new models can predict the stress relaxation behavior of high-temperature bolting well.

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