Effect of annealing on microstructure and mechanical properties of CrCoNi medium entropy alloy rolled at room temperature and liquid nitrogen temperature

CHEN Jinliang; JIN Xueyuan; YI Jianhong

doi:10.7513/j.issn.1004-7638.2025.03.023

Volume 46 Issue 3

Jun. 2025

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CHEN Jinliang, JIN Xueyuan, YI Jianhong. Effect of annealing on microstructure and mechanical properties of CrCoNi medium entropy alloy rolled at room temperature and liquid nitrogen temperature[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(3): 167-173, 204. doi: 10.7513/j.issn.1004-7638.2025.03.023

Citation:

CHEN Jinliang, JIN Xueyuan, YI Jianhong. Effect of annealing on microstructure and mechanical properties of CrCoNi medium entropy alloy rolled at room temperature and liquid nitrogen temperature[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(3): 167-173, 204. doi: 10.7513/j.issn.1004-7638.2025.03.023

Citation:

CHEN Jinliang, JIN Xueyuan, YI Jianhong. Effect of annealing on microstructure and mechanical properties of CrCoNi medium entropy alloy rolled at room temperature and liquid nitrogen temperature[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(3): 167-173, 204. doi: 10.7513/j.issn.1004-7638.2025.03.023

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Effect of annealing on microstructure and mechanical properties of CrCoNi medium entropy alloy rolled at room temperature and liquid nitrogen temperature

doi: 10.7513/j.issn.1004-7638.2025.03.023

1.
Institute of Vanadium and Titanium, Panzhihua University, Panzhihua 617000, Sichuan, China
2.
Public Experimental Teaching Center, Panzhihua University, Panzhihua 617000, Sichuan, China
3.
School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China

Received Date: 2024-04-12
Publish Date: 2025-06-30

Abstract

Abstract

The as-casted CrCoNi medium entropy alloy was rolled at room temperature and liquid nitrogen temperature, respectively, and then annealed at medium and low temperatures in short period respectively. The difference of strength and improvement of the alloy under room temperature rolling + annealing and liquid nitrogen temperature rolling + annealing conditions was studied. The experimental results show that when the annealing parameter is 700 ℃/30 min, the yield strengths of studied alloy under both two rolling conditions are much higher than 1000 MPa, and the fracture elongation of LNTR-700℃ sample is 26.2%, which is much higher than the reported values of strength and elongation for same alloy under same annealing conditions. When the annealing parameter is 800 ℃/30 min, the yield strength of RTR-800℃ alloy is 987 MPa and the fracture elongation is 37.2%, while the yield strength of LNTR-800℃ sample is 947 MPa and the fracture elongation is 58%. In other words, compared with room temperature rolling + annealing, liquid nitrogen temperature rolling + annealing process can significantly improve the strength and ductility of CrCoNi medium entropy, which is attributed to the finer grains, higher recrystallization degree and lower dislocation density benefited from liquid nitrogen temperature rolling + annealing process.
- CrCoNi medium entropy alloy,
- room temperature rolling,
- liquid nitrogen temperature rolling,
- medium and low temperature annealing,
- structure and properties

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References

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