Effect of heat treatment on mechanical and corrosion resistance properties of Fe-25Mn-18Cr-3.5Ni-2Al stainless steel

Zeng Zeyao

doi:10.7513/j.issn.1004-7638.2022.05.023

Volume 43 Issue 5

Nov. 2022

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Zeng Zeyao. Effect of heat treatment on mechanical and corrosion resistance properties of Fe-25Mn-18Cr-3.5Ni-2Al stainless steel[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(5): 158-165. doi: 10.7513/j.issn.1004-7638.2022.05.023

Citation:

Zeng Zeyao. Effect of heat treatment on mechanical and corrosion resistance properties of Fe-25Mn-18Cr-3.5Ni-2Al stainless steel[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(5): 158-165. doi: 10.7513/j.issn.1004-7638.2022.05.023

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Effect of heat treatment on mechanical and corrosion resistance properties of Fe-25Mn-18Cr-3.5Ni-2Al stainless steel

doi: 10.7513/j.issn.1004-7638.2022.05.023

Zeng Zeyao

State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua 617000, Sichuan, China

Received Date: 2021-11-01
Publish Date: 2022-11-01

Abstract

Abstract

The properties of Fe-25Mn-18Cr-3.5Ni-2Al test steel under different heat treatment processes were tested by tensile, impact, and electrochemical methods. The SEM, EBSD, and XRD analysis showed that the volume fraction of the austenite phase decreased gradually with the increase of solid solution temperature. After solid solution at 900, 950 ℃, and 1000 ℃, the volume fraction of the austenite phase separated by EBSD decreased to 60.2%, 48.7%, and 20.0%, respectively. Austenite changes from a sharp fishbone shape to an isolated long needle shape distributed on the ferrite grain boundary. With the increase of ferrite phase content, the strength and hardness of the test steel increase, and the impact toughness decreases. After solution treatment at 900−1000 ℃, the ferrite phase content increases, and the orientation of (001)_bcc decreases gradually. After tempering at 700 ℃, only α NiAl nanoparticles with dispersed distribution appear in the phase and show a brittle fracture. The polarization test shows that the pitting potential gradually moves forward with the increase of solution temperature. The sample treated at 1000 ℃ has a long passivation zone and secondary passivation in the 3.5% NaCl polarization test. E_corr=−257 mV, E_b=−46.5 mV, has good corrosion resistance and mechanical properties and is recommended as the actual production heat treatment temperature.
- stainless steels,
- secondary austenite phase,
- brittle fracture,
- pitting corrosion

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References(18)

References

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