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Combined Effects of Mn, C, and H on the Stacking Fault Energy in Austenitic Mn Steels
Author(s) -
Jin Wen-Long,
Cao Jin-Li,
Li Jin-Xu
Publication year - 2021
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.202000550
Subject(s) - austenite , manganese , ternary operation , materials science , stacking fault energy , metallurgy , trimer , analytical chemistry (journal) , crystallography , chemistry , alloy , microstructure , dimer , organic chemistry , chromatography , computer science , programming language
Manganese, carbon, and hydrogen are common alloying elements in austenitic Mn steels, which all influence the stacking fault energy (SFE), with Mn and H decreasing while C increasing it. The combined effects of Mn, C, and H on the SFE in austenitic Fe 1− x Mn x alloys, including pure Fe, Fe 31 Mn, Fe 15 Mn, Fe 7 Mn, and Fe 3 Mn, using first‐principles calculations, are investigated. The enhancing effect of C on the SFE is 29 mJ m −2 lower in Fe 3 Mn than in pure Fe, whereas it remains largely unchanged for low Mn concentrations. The noticeable combined Mn−C effect for Fe 3 Mn is mainly due to the formation of Mn−C−Mn trimer. Similarly, the boosting effect of H is weakened with increasing Mn content. As for the ternary Mn−C−H effect, it is found that it is generally stronger than that of binary effects. All the binary and ternary effects are much smaller than those of individual elements, indicating weak multiatom interactions of Mn, C, and H.