Determining Hot Deformation Behavior and Rheology Laws of Selected Austenitic Stainless Steels
Abstract
:1. Introduction
2. Materials and Methods
2.1. Experimental Material
2.2. Hot Compression Testing
2.3. Structure Analyses
2.4. Calculating the Rheology Law
3. Results
3.1. Rheology Law
3.2. Deformation Behavior
3.3. Microstructure Observations
4. Discussion
5. Conclusions
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- The ChN35VT steel showed higher flow stress values than the 08Ch18N10T steel;
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- The 08Ch18N10T steel exhibited a larger grain size at all the tested strain rates and temperatures (at both the strain rates, the grain size for the 08Ch18N10T steel was approx. doubled at 900 °C, and ~1.3 times larger at 1060 °C);
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- The ChN35VT steel microstructure generally exhibited higher fractions of high-angle grain boundaries, which points to the development of dynamic recrystallization;
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- The mathematical description of the experimental data via the Hensel-Spittel models provided satisfactory curve fits, especially at lower temperatures;
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- The developed Hensel-Spittel rheology low for the ChN35VT steel was
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- The developed Hensel-Spittel rheology low for the 08Ch18N10T steel was
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Steel Type | Ni | Cr | W | Mn | Ti | Si | S | P | C |
---|---|---|---|---|---|---|---|---|---|
ChN35VT | 34–38 | 13.5–16.5 | 2.7–3.7 | 1–2 | 1.2–1.9 | <0.8 | <0.03 | <0.045 | <0.12 |
08Ch18N10T | 9.5–12.0 | 17.0–19.0 | <2 | >5x%C | <10 | <0.03 | <0.045 | <0.10 |
Steel Type | Rp0,2 [MPa] | Rm [MPa] | A [%] | KCU (RT) [J/cm2] |
---|---|---|---|---|
ChN35VT | 392 | 735 | 15 | 59 |
08Ch18N10T | 195 | 550–750 | 35 | 80 |
T (°C)/ε· (s−1) | 0.01 | 0.1 | 1 | 10 |
---|---|---|---|---|
850 | a | a | a | a |
900 | a | a, b | a, b | a, b |
970 | a | a | a | a |
1060 | a, b | a, b | a, b | a, b |
1150 | a | a | a | a |
1250 | a | a | a,b | a |
Parameter | ChN35VT | 08Ch18N10T |
---|---|---|
A | 0.11849 | 165,812,128.83665 |
m1 | −0.00520 | −0.00131 |
m2 | 0.26891 | 0.17785 |
m3 | −0.22211 | −0.36327 |
m4 | −0.00472 | −0.02081 |
m5 | −0.00128 | −0.00113 |
m7 | 0.12993 | 0.29098 |
m8 | 0.00034 | 0.00047 |
m9 | 1.94258 | −1.74049 |
RMSE (MPa) | 14.30052 | 8.40329 |
R | 0.99238 | 0.99307 |
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Němec, J.; Kunčická, L.; Opěla, P.; Dvořák, K. Determining Hot Deformation Behavior and Rheology Laws of Selected Austenitic Stainless Steels. Metals 2023, 13, 1902. https://doi.org/10.3390/met13111902
Němec J, Kunčická L, Opěla P, Dvořák K. Determining Hot Deformation Behavior and Rheology Laws of Selected Austenitic Stainless Steels. Metals. 2023; 13(11):1902. https://doi.org/10.3390/met13111902
Chicago/Turabian StyleNěmec, Josef, Lenka Kunčická, Petr Opěla, and Karel Dvořák. 2023. "Determining Hot Deformation Behavior and Rheology Laws of Selected Austenitic Stainless Steels" Metals 13, no. 11: 1902. https://doi.org/10.3390/met13111902