INFLUENCE OF DEFORMATION TEMPERATURE ON HOT DEFORMATION BEHAVIOR OF COLD SPRAYED 304 STAINLESS STEEL COATING MATERIAL

316LN stainless steel with 0.08%N (08N) and 0.17%N (17N) was compressed at 1073–1473 K and 0.001–10 s−1. The hot deformation behavior was investigated using stress-strain curve analysis, processing maps, and so forth. The microstructure was analyzed through electron backscatter diffraction analysis. Under most conditions, the deformation resistance of 17N was higher than that of 08N. This difference became more pronounced at lower temperatures. The strain rate sensitivity increased with increasing temperature for types of steel. In addition, the higher the N content, the higher the strain rate sensitivity. Hot deformation activation energy increased from 487 kJ/mol to 549 kJ/mol as N concentration was increased from 0.08% to 0.17%. The critical strain for initiation of dynamic recrystallization was lowered with increasing N content. In the processing maps, both power dissipation ratio and unstable region increased with increasing N concentration. In terms of microstructure evolution, N promoted dynamic recrystallization kinetic and decreased dynamic recrystallization grain size. The grain growth rate was lower in 17N than in 08N during heat treatment. Finally, it was found that N favored twin boundary formation.

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Investigation on hot deformation behavior of 00Cr23Ni4N duplex stainless steel under medium–high strain rates

Materials Characterization ◽

10.1016/j.matchar.2010.11.013 ◽

2011 ◽

Vol 62 (2) ◽

pp. 198-203 ◽

Cited By ~ 41

Author(s):

Ying Han ◽

Dening Zou ◽

Zhiyu Chen ◽

Guangwei Fan ◽

Wei Zhang

Keyword(s):

Stainless Steel ◽

Duplex Stainless Steel ◽

Hot Deformation ◽

Deformation Behavior ◽

High Strain ◽

Strain Rates ◽

Hot Deformation Behavior ◽

High Strain Rates

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Hot Deformation Behavior and Microstructure Evolution of a DC Cast Hypereutectic Al-Si Alloy

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.151.332 ◽

2012 ◽

Vol 151 ◽

pp. 332-336

Author(s):

Ke Zhun He ◽

Fu Xiao Yu ◽

Da Zhi Zhao ◽

Liang Zuo

Keyword(s):

Strain Rate ◽

Microstructure Evolution ◽

Hot Deformation ◽

Deformation Behavior ◽

Deformation Temperature ◽

Peak Stress ◽

Strain Rate Range ◽

Hot Deformation Behavior ◽

Strong Function ◽

Primary Si

The hot deformation behavior and microstructure evolution of a DC cast hypereutectic Al-Si alloy was studied in the temperature range of 400-500 °C and strain rate range of 0.001-1 s-1. The results show that the as-cast microstructure of the alloy consists of polygonal primary Si particles and α-aluminum dendritic halos with Al-Si eutectics and intermetallic compounds segregated into the interdendritic regions. The flow stress of the alloy is a strong function of temperature and strain rate, and the peak stress is increased with the decrease of deformation temperature and the increase of strain rate. All the true stress-true stain curves in the experiments exhibit dynamic softening. The fracture frequency of primary Si particle is decreased with the increase of deformation temperature and the decrease of strain rate. The dynamic flow softening is mainly as a result of dynamic recrystallization.

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