Design of high-manganese steels for additive manufacturing applications with energy-absorption functionality

被引:67
作者
Kies, Fabian [1 ]
Koehnen, Patrick [1 ]
Wilms, Markus B. [2 ]
Brasche, Frederike [3 ]
Pradeep, Konda G. [4 ]
Schwedt, Alexander [5 ]
Richter, Silvia [5 ]
Weisheit, Andreas [2 ]
Schleifenbaum, Johannes H. [2 ,6 ]
Haase, Christian [1 ]
机构
[1] Rhein Westfal TH Aachen, Steel Inst, D-52072 Aachen, Germany
[2] Fraunhofer Inst Laser Technol ILT, D-52074 Aachen, Germany
[3] Rhein Westfal TH Aachen, Inst Phys Met & Met Phys, D-52074 Aachen, Germany
[4] Rhein Westfal TH Aachen, Mat Chem, D-52074 Aachen, Germany
[5] Rhein Westfal TH Aachen, Cent Facil Electron Microscopy, D-52074 Aachen, Germany
[6] Rhein Westfal TH Aachen, Chair Digital Addit Prod, D-52074 Aachen, Germany
关键词
Fe-Mn-Al-C; Solidification; Deformation; Thermodynamics; Additive manufacturing; INDUCED PLASTICITY STEELS; STACKING-FAULT ENERGY; MARTENSITIC-TRANSFORMATION; MECHANICAL-PROPERTIES; TENSILE PROPERTIES; TEXTURE ANALYSIS; HOT DUCTILITY; TWIP STEEL; MICROSTRUCTURE; DEFORMATION;
D O I
10.1016/j.matdes.2018.10.051
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
High-manganese steels (HMnS) are alloys with outstanding mechanical properties, but their application is inhibited by inherent limitations in conventional processing. Additive manufacturing (AM) provides an alternative to make use of the unique properties of HMnS due to strongly differing processing conditions. However, no established methodology exists currently to tailor metallic alloys specifically for AM. Therefore, a methodology combining theoretical and experimental screening was used to design a HMnS specifically suited for AM. First, different chemical compositions were screened with thermodynamics-based stacking fault energy (SFE) maps to predict the activation of transformation-induced plasticity (TRIP) and twinning-induced plasticity (TWIP). For experimental screening, selected X30MnAl23-# alloys (with # <= 2 wt%) were produced by laser metal deposition (LMD). The metal physical mechanisms active during solidification and plastic deformationwere identified bymultiscale microstructure characterization (XRD, OM, SEM, EBSD, EDX, EPMA, APT) and tensile testing. Finally, two steels with the highestwork-hardening capacity and formabilitywere applied in lattice structures produced by selective laser melting (SLM) and compared to benchmark 316L steel. The correlation of AM-specific features of HMnS and their effect on deformation behavior as well as the applicability of the used methodology are discussed to illustrate the effectiveness of the chosen approach toward the development of high performance materials for AM. (c) 2018 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1250 / 1264
页数:15
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