TY - JOUR
T1 - Phase equilibria, martensitic transformations and deformation behaviors of the subsystem of Cantor alloy−low-cost Fe-Mn-Cr alloys
AU - Ruan, Jingjing
AU - Ueshima, Nobufumi
AU - Li, Haoge
AU - Oikawa, Katsunari
N1 - Funding Information:
This work was supported by a Grant-in-Aid for Scientific Research on Innovative Areas "High Entropy Alloys - Science of New Class of Materials Based on Elemental Multiplicity and Heterogeneity" (JSPS KAKENHI Grant Number 18H05454). J.J. Ruan performed the experiments including EPMA, FE-SEM, EBSD, compression experiments and tensile tests, etc. calculated the SFEs for the alloys investigated, and wrote the paper. N. Ueshima and K. Oikawa discussed the details of the concepts of this study with J.J. Ruan and revised the manuscript. H.G. Li performed the XRD experiments in this work, and discussed with J.J. Ruan in analyzing the XRD results. The authors declare no competing interests. We would like to thank Editage (www.editage.com) for English language editing.
Funding Information:
This work was supported by a Grant-in-Aid for Scientific Research on Innovative Areas "High Entropy Alloys - Science of New Class of Materials Based on Elemental Multiplicity and Heterogeneity " ( JSPS KAKENHI Grant Number 18H05454 ). J.J. Ruan performed the experiments including EPMA, FE-SEM, EBSD, compression experiments and tensile tests, etc., calculated the SFEs for the alloys investigated, and wrote the paper. N. Ueshima and K. Oikawa discussed the details of the concepts of this study with J.J. Ruan and revised the manuscript. H.G. Li performed the XRD experiments in this work, and discussed with J.J. Ruan in analyzing the XRD results. The authors declare no competing interests. We would like to thank Editage ( www.editage.com ) for English language editing.
Publisher Copyright:
© 2021 Acta Materialia Inc.
PY - 2021/12
Y1 - 2021/12
N2 - Investigations of the Fe-Mn-Cr system are not only significant for developing Cantor alloy but also valuable for designing low-cost, high-strength steel. In this study, we experimentally determined the phase equilibria of this system for establishing the thermodynamic database. Additionally, the influences of Mn on both the phase transformation and deformation behaviors of the Fe-Mn-Cr alloys were studied. Fe was found to solute into σHT phase with a large solubility at 1323 and 1473 K. A (βMn) single-phase region was initially discovered at 1473 K. The (βMn)+(γFe) and σHT+(Cr) two-phase regions were respectively found to be very narrow. During tensile testing, the transformation-induced-plasticity (TRIP)- type was discovered to change from ε→α′ to (γFe)→ε when Mn increased from 20 to 30 at. %. The stacking fault energy (SFE) was measured to be 8.1 mJ·m−2 for 30Mn alloy. Contrarily, the stacking fault did not seem to occur during the tensile testing of 40Mn alloy. The 0.2 % proof stresses for Fe(90-x)MnxCr10 alloys were measured to be 633 (10Mn), 345 (20Mn), 166 (30Mn), and 188 MPa (40Mn), respectively. The TRIP effect was discovered in the tensile testing of 30Mn alloy, which exhibited an ultimate tensile strength of 755 MPa and a uniform elongation of 38.7 %. It is to be noted that no recovery of work-hardening rate occurred during the tensile testing of 40Mn alloy. The investigated phase equilibria and deformation behaviors of the Fe-Mn-Cr alloys are believed to accelerate the design of Cantor-alloy-related materials and Fe-Mn-Cr-based high-strength steel.
AB - Investigations of the Fe-Mn-Cr system are not only significant for developing Cantor alloy but also valuable for designing low-cost, high-strength steel. In this study, we experimentally determined the phase equilibria of this system for establishing the thermodynamic database. Additionally, the influences of Mn on both the phase transformation and deformation behaviors of the Fe-Mn-Cr alloys were studied. Fe was found to solute into σHT phase with a large solubility at 1323 and 1473 K. A (βMn) single-phase region was initially discovered at 1473 K. The (βMn)+(γFe) and σHT+(Cr) two-phase regions were respectively found to be very narrow. During tensile testing, the transformation-induced-plasticity (TRIP)- type was discovered to change from ε→α′ to (γFe)→ε when Mn increased from 20 to 30 at. %. The stacking fault energy (SFE) was measured to be 8.1 mJ·m−2 for 30Mn alloy. Contrarily, the stacking fault did not seem to occur during the tensile testing of 40Mn alloy. The 0.2 % proof stresses for Fe(90-x)MnxCr10 alloys were measured to be 633 (10Mn), 345 (20Mn), 166 (30Mn), and 188 MPa (40Mn), respectively. The TRIP effect was discovered in the tensile testing of 30Mn alloy, which exhibited an ultimate tensile strength of 755 MPa and a uniform elongation of 38.7 %. It is to be noted that no recovery of work-hardening rate occurred during the tensile testing of 40Mn alloy. The investigated phase equilibria and deformation behaviors of the Fe-Mn-Cr alloys are believed to accelerate the design of Cantor-alloy-related materials and Fe-Mn-Cr-based high-strength steel.
KW - Martensite transformation
KW - Microstructure
KW - Phase diagrams
KW - Stacking-fault energy
KW - TRIP-assisted steel
UR - http://www.scopus.com/inward/record.url?scp=85116099796&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85116099796&partnerID=8YFLogxK
U2 - 10.1016/j.mtla.2021.101231
DO - 10.1016/j.mtla.2021.101231
M3 - Article
AN - SCOPUS:85116099796
SN - 2589-1529
VL - 20
JO - Materialia
JF - Materialia
M1 - 101231
ER -