Microstructure and mechanical behavior of laser aided additive manufactured low carbon interstitial Fe49.5Mn30Co10Cr10C0.5 multicomponent alloy

被引：26

作者：

Chew, Y. ^{[1
]}

Zhu, Z. G. ^{[1
]}

Weng, F. ^{[1
]}

Gao, S. B. ^{[2
]}

Ng, F. L. ^{[1
]}

Lee, B. Y. ^{[1
]}

Bi, G. J. ^{[1
]}

机构：

[1] Singapore Inst Mfg Technol, 73 Nanyang Dr, Singapore 637662, Singapore

[2] Nanyang Technol Univ, Sch Mech & Aerosp Engn, 50 Nanyang Ave, Singapore 639798, Singapore

来源：

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2021年 / 77卷

关键词：

Multicomponent alloys; Laser aided additive manufacturing; Additive manufacturing; Microstructure; Mechanical property; HIGH-ENTROPY ALLOY; STRENGTHENING MECHANISMS; HIERARCHICAL MICROSTRUCTURE; GRAIN-SIZE; DEFORMATION; PHASE; STRESS; SINGLE; FE;

D O I：

10.1016/j.jmst.2020.11.026

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 (sigma(y)), ultimate tensile strength (sigma(UTS)) and elongation (epsilon(UTS)) 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 epsilon(UTS) was attributed to dislocation motion and activation of both twinning and transformation-induced plasticity (TWIP and TRIP). Tensile tests performed at -40 degrees C and -130 degrees 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 degrees C and -130 degrees C. Instead, higher fraction of strain-induced hexagonal close-packed (HCP) epsilon phase transformation of 21.2 % were observed for fractured sample tested at -40 degrees C, compared with 6.3 % in fractured room temperature sample. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

引用

页码：38 / 46

页数：9

共 48 条

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