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Title: Microstructure and mechanical behavior of laser aided additive manufactured low carbon interstitial Fe₄₉.₅Mn₃₀Co₁₀Cr₁₀C₀.₅ multicomponent alloy
Authors: Chew, Youxiang
Zhu, Zhiguang
Weng, Fei
Gao, Shubo
Ng, Fern Lan
Lee, Bing Yang
Bi, Guijun
Keywords: Engineering::Materials
Issue Date: 2021
Source: Chew, Y., Zhu, Z., Weng, F., Gao, S., Ng, F. L., Lee, B. Y. & Bi, G. (2021). Microstructure and mechanical behavior of laser aided additive manufactured low carbon interstitial Fe₄₉.₅Mn₃₀Co₁₀Cr₁₀C₀.₅ multicomponent alloy. Journal of Materials Science & Technology, 77, 38-46.
Project: A1893a0031
Journal: Journal of Materials Science & Technology
Abstract: Laser aided additive manufacturing (LAAM) was used to fabricate bulk Fe49.5Mn30Co10Cr10C0.5 interstitial multicomponent alloy using pre-alloyed powder. The room temperature yield strength (σy), ultimate tensile strength (σUTS) and elongation (εUTS) were 645 MPa, 917 MPa and 27.0 % respectively. The as-built sample consisted of equiaxed and dendritic cellular structures formed by elemental segregation. These cellular structures together with oxide particle inclusions were deemed to strengthen the material. The other contributing components include dislocation strengthening, friction stress and grain boundary strengthening. The high εUTS was attributed to dislocation motion and activation of both twinning and transformation-induced plasticity (TWIP and TRIP). Tensile tests performed at −40 °C and −130 °C demonstrated superior tensile strength of 1041 MPa and 1267 MPa respectively. However, almost no twinning was observed in the fractured sample tested at −40 °C and −130 °C. Instead, higher fraction of strain-induced hexagonal close-packed (HCP) ε phase transformation of 21.2 % were observed for fractured sample tested at −40 °C, compared with 6.3 % in fractured room temperature sample.
ISSN: 1005-0302
DOI: 10.1016/j.jmst.2020.11.026
Schools: School of Mechanical and Aerospace Engineering 
Research Centres: Singapore Institute of Manufacturing Technology 
Rights: © 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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