Investigation on elastic and thermodynamic properties of Fe25Cr20NiMnNb austenitic stainless steel at high temperatures from first principles

The thermal relaxation behavior of residual stress and microstructure at high temperatures in S30432 austenitic stainless steel after shot peening was investigated by X-ray residual stress analyzer. The effects of exposure time and applied temperature on the residual stress and microstructure relaxation were particularly analyzed and discussed. A significant decrease of the residual stress values were observed in the first period of exposure time, followed by slowing down and then stabilization. It was also observed that a higher applied temperature produced greater relaxation. In terms of microstructure, the domain size and micro-strain were calculated by Voigt method, the results showed that the refined domain size and high micro-strain induced by shot peening were greatly relaxed at the first stage of annealing, then stabilized. With higher annealing temperature, the recrystallization behavior in the shot peened deformed layer was more obvious. Based on the results of line profile analysis, the recrystallization activation energy and micro-strain relaxation energy were calculated, respectively.

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FIRST-PRINCIPLES CALCULATIONS OF STRUCTURE, STABILITY AND THERMODYNAMIC PROPERTIES OF fcc-6LiT UNDER HIGH TEMPERATURES AND PRESSURES

Modern Physics Letters B ◽

10.1142/s0217984911025705 ◽

2011 ◽

Vol 25 (05) ◽

pp. 333-344 ◽

Cited By ~ 1

Author(s):

CHENGHUA HU ◽

FENG WANG ◽

CHUANHUI XIA ◽

ZHOU ZHENG ◽

WEIYI REN

Keyword(s):

Heat Capacity ◽

Melting Point ◽

Thermodynamic Properties ◽

Debye Temperature ◽

High Temperatures ◽

First Principles ◽

Critical Pressure ◽

Structure Stability ◽

First Principles Calculations ◽

Different Temperatures

We perform first-principles calculations for fcc-6 LiT in order to study its structure, stability and thermodynamic properties under high temperatures and pressures. We find that melting point of 6 LiT (0 GPa) is about 680 K, and rise with the pressures. Reverse equivalent pressure P r and critical pressure P c of different temperatures are predicted from [Formula: see text] or [Formula: see text], and they are found to increase with temperature. 6 LiT should be stable under the condition of P < 80 GPa and T < 680 K . We also find that pressure and temperature will cause different effect of shear on the {100} and {110} planes. Heat capacity of different pressures increase with temperature and closes to the Dulong–Petit limit at higher temperatures. Debye temperature decreases with temperature, and increases with pressure.

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First-principles evaluation of the effect of alloying elements on the lattice parameter of a 23Cr25NiWCuCo austenitic stainless steel to model solid solution hardening contribution to the creep strength

Materials Science and Engineering A ◽

10.1016/j.msea.2014.12.057 ◽

2015 ◽

Vol 626 ◽

pp. 213-219 ◽

Cited By ~ 29

Author(s):

P.A. Korzhavyi ◽

R. Sandström

Keyword(s):

Solid Solution ◽

Stainless Steel ◽

Austenitic Stainless Steel ◽

Creep Strength ◽

First Principles ◽

Lattice Parameter ◽

Alloying Elements ◽

Solid Solution Hardening ◽

Solution Hardening ◽

Effect Of Alloying

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Combined experiment and first-principles study of the formation of the Al2O3 layer in alumina-forming austenitic stainless steel

RSC Advances ◽

10.1039/c7ra00860k ◽

2017 ◽

Vol 7 (26) ◽

pp. 15727-15734 ◽

Cited By ~ 6

Author(s):

Nan Dong ◽

Yongfeng Qiao ◽

Caili Zhang ◽

Jian Wang ◽

Guangwei Fan ◽

...

Keyword(s):

Stainless Steel ◽

Austenitic Stainless Steel ◽

Oxide Layer ◽

First Principles ◽

Multilayer Structure ◽

Al2o3 Layer ◽

First Principles Study ◽

The Matrix

Combined experiment and DFT research on the formation of the Al2O3 layer in AFA stainless steel is presented. The oxide layer has the multilayer structure with outer Cr2O3 and inner Al2O3 due to the diffusion of Al from the matrix to the Cr2O3 slab.

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