scholarly journals Elevated temperature strain aging of conventional and ausform steels

1965 ◽  
Author(s):  
Virenda Singh Goel
Keyword(s):  
Elevated Temperature ◽  
Strain Aging ◽  
Temperature Strain

The Influence of Deformation Condition on Microstructure and Properties of GH4169 Alloy

2005 ◽  
Vol 475-479 ◽  
pp. 3003-3006 ◽  
Author(s):  
Yong Wei Wang ◽  
Lu Yi Yang ◽  
Wei You ◽  
Bing Zhe Bai
Keyword(s):  
Elevated Temperature ◽  
Strain Rate ◽  
Deformation Condition ◽  
Isothermal Deformation ◽  
Lower Strain ◽  
Direct Aging ◽  
Higher Temperature ◽  
Temperature Strain ◽  
Microstructure Of The Material ◽  
Gh4169 Alloy

The influence of temperature, strain rate, strain on mechanical parameters and microstructure evolution in isothermal deformation of GH4169 alloy were investigated. Lower resistance is obtained under higher temperature and or lower strain rate. However, coarser microstructure also is gained under such condition. The tensile property at room temperature and elevated temperature, permanent properties at elevated temperature of the GH4169 alloy with the treatment of “direct aging after isothermal deformation” are better than those of the same alloy with the treatment of solid-solution+direct aging after isothermal deformation. Isothermal forming was undertaken for a 1/4 size simulated part of a kind of turbo disk of an aviation engine. Its external is fine and the microstructure of the material was fine and homogeneous for both straightly after forming and after direct aging.

Generation of Constant Life Diagram under Elevated Temperature Ratcheting of 316LN Stainless Steel

2016 ◽  
Vol 35 (4) ◽  
pp. 361-368 ◽  
Author(s):  
Aritra Sarkar ◽  
A. Nagesha ◽  
R. Sandhya ◽  
M.D. Mathew
Keyword(s):  
Stainless Steel ◽  
Elevated Temperature ◽  
Strain Aging ◽  
Strong Influence ◽  
Stress Amplitude ◽  
Safe Zone ◽  
Dynamic Strain ◽  
Mean Stress ◽  
Cyclic Life ◽  
Plastic Domain

AbstractCombined influence of mean stress and stress amplitude on the cyclic life under elevated temperature (823–923 K) ratcheting of 316LN austenitic stainless steel is discussed. Constant life Haigh diagrams have been generated, using different combinations of stress amplitude and mean stress. In the plastic domain, the allowable stress was found to increase or decrease with mean stress depending on the temperature and combination of mean stress – stress amplitude employed. Strong influence of dynamic strain aging (DSA) was found at 823 K which affected the mode of deformation of the material in comparison with 923 K. Failure mode expressed through a fracture mechanism map was found to change from fatigue to necking depending on the test temperature as well as combinations of mean stress and stress amplitude. Occurrence of DSA at 823 K proved to be beneficial by way of extending the safe zone of operation to higherR-ratios in comparison with 923 K.

Strengthening of doped cold-rolled steels in low-temperature strain-aging

1992 ◽  
Vol 34 (4) ◽  
pp. 279-283
Author(s):  
O. A. Girina ◽  
N. M. Fonshtein ◽  
B. A. Bukreev
Keyword(s):  
Low Temperature ◽  
Strain Aging ◽  
Cold Rolled ◽  
Temperature Strain

A Study on the Phenomenological Constitutive Model of Mg-12Gd-5Y-3Zn-0.6Zr Magnesium Alloy Forming at Elevated Temperature

2014 ◽  
Vol 624 ◽  
pp. 71-76
Author(s):  
Guang Lu ◽  
Zhi Min Zhang ◽  
Yong Xue ◽  
Bao Cheng Li
Keyword(s):  
Elevated Temperature ◽  
Flow Stress ◽  
Magnesium Alloy ◽  
Constitutive Model ◽  
Strain Softening ◽  
True Strain ◽  
Strain Rates ◽  
Strain And Strain Rate ◽  
Process Simulator ◽  
Temperature Strain

Quantities Mg-12Gd-5Y-3Zn-0.6Zr magnesium alloy billets were compressed with true strain 0.7 on hot process simulator at 350,400,450,480°C under strain rates of 0.001, 0.01, 0.1 and 0.5s-1. A constitutive model with a few parameters is used to characterize the dynamic recrystallization strain softening of Mg-12Gd-5Y-3Zn-0.6Zr alloy, which comprehensively reflect the effects of the deformation temperature, strain and strain rate on flow stress.

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