Flow Stress Behavior and Microstructure Evolution of Austenitic Stainless Steel with Low Copper Content during Hot Compression Deformation
Abstract
:1. Introduction
2. Experimental
3. Results and Discussions
3.1. Microstructure
3.2. The Deformation Behaviors during Hot Deformation
3.2.1. Effect of Recrystallization on Deformation Behavior
3.2.2. Hot Deformation Constitutive Equation
4. Conclusions
- (1)
- The ratio of recrystallization nucleating sites, located in the twin boundaries, is higher when the strain rates are increasing. The twins depend on recrystallization and promote dynamic recrystallization. The dynamic recrystallization mechanism of thermal deformation is mainly discontinuous dynamic recrystallization.
- (2)
- The adiabatic temperature rise increases with the decrease of temperature and the increase of strain rate. By modifying the stress-strain curve, the influence of adiabatic temperature rise at high rate (≥1 s−1) is eliminated.
- (3)
- The constitutive equation of peak stress is established through kinetic analysis as follows.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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C | Si | Mn | P | S | Cr | Ni | Cu |
---|---|---|---|---|---|---|---|
0.003 | 0.44 | 1.54 | 0.009 | 0.001 | 18.05 | 8.50 | 1.52 |
α | n | Q | LnA | ||||
---|---|---|---|---|---|---|---|
a0 | 0.01364 | n0 | 7.20089 | Q0 | 177857.4301 | A0 | 16.31829 |
a1 | −0.03141 | n1 | −2.7189 | Q1 | 3009200 | A1 | 257.78717 |
a2 | 0.13479 | n2 | −3.13846 | Q2 | −15454900 | A2 | −1333.17329 |
a3 | −0.3247 | n3 | 16.2329 | Q3 | 37634900 | A3 | 3256.41102 |
a4 | 0.39356 | n4 | −12.16705 | Q4 | −43657000 | A4 | −3771.69205 |
a5 | −0.18333 | n5 | −2.17917 | Q5 | 19264800 | A5 | 1656.975 |
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Li, H.; Gao, L.; Song, Y.; Ma, L.; Liu, H.; Li, J.; Zhao, G. Flow Stress Behavior and Microstructure Evolution of Austenitic Stainless Steel with Low Copper Content during Hot Compression Deformation. Crystals 2021, 11, 1408. https://doi.org/10.3390/cryst11111408
Li H, Gao L, Song Y, Ma L, Liu H, Li J, Zhao G. Flow Stress Behavior and Microstructure Evolution of Austenitic Stainless Steel with Low Copper Content during Hot Compression Deformation. Crystals. 2021; 11(11):1408. https://doi.org/10.3390/cryst11111408
Chicago/Turabian StyleLi, Huaying, Lihong Gao, Yaohui Song, Lidong Ma, Haitao Liu, Juan Li, and Guanghui Zhao. 2021. "Flow Stress Behavior and Microstructure Evolution of Austenitic Stainless Steel with Low Copper Content during Hot Compression Deformation" Crystals 11, no. 11: 1408. https://doi.org/10.3390/cryst11111408