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Low-Temperature Induced Martensitic Transformation Enhancing Mechanical Properties of Metastable Fe-Ni-P Alloy

School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
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Metals 2019, 9(7), 785; https://doi.org/10.3390/met9070785
Received: 15 June 2019 / Revised: 9 July 2019 / Accepted: 13 July 2019 / Published: 14 July 2019
(This article belongs to the Special Issue Phase Transformations in Metallic Materials)
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Abstract

The metastable Fe-Ni-P alloy with phosphorus (P) solid-solution structure has been fabricated by spark plasma sintering. Its face-centered cubic (FCC) matrix without the precipitation of phosphide attains a high plasticity and an excellent strain hardening ability at room temperature. This Fe-Ni-P alloy is subjected to cryogenic treatment at various temperatures (−20 °C and −50 °C), to investigate the role of phosphorus on the microstructural evolution and mechanical properties of γ-(Fe-Ni) alloy at low temperatures. The results indicate that the addition of phosphorus can destabilize the Fe-Ni-P alloy and facilitate its martensitic transformation during cryogenic treatment. P-doping does not lead to obvious embrittlement of Fe-Ni-P alloy at low temperatures, but strengthens the alloy by promoting microstructure evolution. The Fe-Ni-P alloy has high plasticity and good strain hardening ability after treated at −20 °C, and is converted to acicular martensite structure after being treated at −50 °C, resulting in a significant increase in its hardness (433 HV) and compressive yield strength (1271 MPa). Developing this Fe-Ni-P alloy as a load-bearing component for low-temperature conditions shows great promise. View Full-Text
Keywords: metastable Fe-Ni-P alloy; cryogenic treatment; martensitic transformation; microstructure; mechanical characterization metastable Fe-Ni-P alloy; cryogenic treatment; martensitic transformation; microstructure; mechanical characterization
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Cui, G.; Jiang, R.; Zhang, C.; Liu, Y. Low-Temperature Induced Martensitic Transformation Enhancing Mechanical Properties of Metastable Fe-Ni-P Alloy. Metals 2019, 9, 785.

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