A Perspective on Strain Hardening Behavior of Materials Considering Mobile Dislocation Density and Activation Volume

2019 ◽  
Vol 50 (8) ◽  
pp. 3472-3477 ◽  
Author(s):  
Sumeet Mishra ◽  
Vikrant Kumar Beura ◽  
Amit Singh ◽  
Manasij Yadava
Keyword(s):  
Dislocation Density ◽  
Strain Hardening ◽  
Activation Volume ◽  
Mobile Dislocation ◽  
Mobile Dislocation Density ◽  
Hardening Behavior ◽  
Strain Hardening Behavior

Influence of Precipitation and Dislocation Density on Flow Stress Characteristics Under Compression Deformation of Heat-Treated 17-4 PH Stainless Steel Alloy

2019 ◽  
Author(s):  
Athul Sathyanath ◽  
Anil Meena
Keyword(s):  
Stainless Steel ◽  
Flow Stress ◽  
Dislocation Density ◽  
Strain Hardening ◽  
Steel Alloy ◽  
Hardening Behavior ◽  
Compression Deformation ◽  
Heat Treated ◽  
Strain Hardening Behavior ◽  
The Impact

Abstract The strengthening mechanism of 17-4 PH stainless steel is mainly due to the precipitation of copper particles in the martensitic lath matrix. The renowned steel grade possesses an exceptional combination of high strength and excellent corrosion resistance and hence is widely employed in high stress environments. In that case, under external loading, the movement and accumulation of dislocations are influenced by the nature of precipitation. Hence, the present study is based on the impact of precipitation on the dislocation induced hardening during compression of the heat-treated 17-4 PH stainless steel. Room temperature uniaxial compression test was used to evaluate the direct effect of precipitates and the dislocation interaction on the flow stress and strain-hardening behavior under the different heat-treated regime. Microstructural evolution during deformation and its influence on the strain-hardening mechanism were analyzed by optical microscopy (OM), scanning electron microscopy (SEM) and X-ray diffraction (XRD). A semi-empirical model was adopted to quantify the role of precipitate nature on the strain-hardening rate. The evaluated normalized microstrain and dislocation density from the XRD analyses were used to explain the observed variation in the mechanical property. Coarse particle precipitation was found to greatly affect the strain-hardening behavior of the steel alloy during compression deformation.

A New Interpretation of Stress Relaxations in Ni3(Al,Hf) Single Crystals.

1994 ◽  
Vol 364 ◽  
Author(s):  
J. Bonneville ◽  
P. Spätig ◽  
J.-L. Martin
Keyword(s):  
Dislocation Density ◽  
Strain Hardening ◽  
Single Crystals ◽  
Mobile Dislocation ◽  
Mobile Dislocation Density ◽  
Flow Strength ◽  
Preliminary Results ◽  
Strain Stress ◽  
New Interpretation ◽  
Strain Hardening Rate

AbstractA technique of repeated stress relaxations is used to characterise the strain hardening rate (K) and the mobile dislocation density (ρm) in the flow strength anomaly domain of Ni3(Al,Hf) single crystals. It is shown that there is no independent means for measuring both effects but that reasonable assumptions about the strain hardening rate lead to determine the variation of ρm during relaxation. Preliminary results indicate that during relaxation ρm decreases more rapidly with strain (stress) when the temperature is raised.

Comprehensive study of strain hardening behavior of CrCoNi medium-entropy alloy

2021 ◽  
pp. 160623
Author(s):  
Bo Guan ◽  
Yitao Wang ◽  
Jianbo Li ◽  
Yu Zhang ◽  
Hao Wang ◽  
...  
Keyword(s):  
Strain Hardening ◽  
Hardening Behavior ◽  
Strain Hardening Behavior ◽  
Comprehensive Study

The creation rate of mobile dislocation density in a creep experiment

1986 ◽  
Vol 20 (8) ◽  
pp. 1075-1078 ◽  
Author(s):  
J.A. Montemayor-Aldrete ◽  
J. Soullard ◽  
R. Gómez-Ramírez ◽  
A. Calles
Keyword(s):  
Dislocation Density ◽  
Mobile Dislocation ◽  
Mobile Dislocation Density ◽  
Creep Experiment ◽  
The Creation ◽  
Creation Rate
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