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author:

Zhao, Wei (Zhao, Wei.) [1] | Xiang, Hongliang (Xiang, Hongliang.) [2] | Zhan, Xianming (Zhan, Xianming.) [3] | Zhang, Xiangkai (Zhang, Xiangkai.) [4] | Wu, Chaochao (Wu, Chaochao.) [5]

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EI

Abstract:

Duplex stainless steels (DSSs) produced via laser powder bed fusion (LPBF) exhibit excellent strength and plasticity compatibility. In this study, in-situ electron backscatter diffraction (EBSD) was employed to investigate the coordinated deformation behavior of 2205 DSSs fabricated by LPBF with heat treatment at 1050 °C for 1 h, including strain distribution behavior and mechanism of stress concentration release. The results indicate that the initial deformation of LPBF samples is primarily concentrated in the austenite phase. As the tension progresses, austenite gradually transitioned to hard orientation, and the strain in austenite can pass through the phase boundary into the ferrite grain. To coordinate the deformation, ferrite transitioned to soft orientation through rotation towards the slip systems of {110} and {1–21}. The stress concentration in ferrite can be alleviated by forming dislocation walls and cells through planar and cross-slip dislocations. In contrast, the stress concentration in austenite can be released by stacking faults and deformation twins. Compared to the as-cast samples, the yield strength of LPBF samples is improved from 472 ± 13 to 641 ± 17 MPa due to fine grain strengthening and dislocation strengthening. This study offers guidance for further enhancing the strength and plasticity of materials prepared by LPBF. © 2024 Elsevier B.V.

Keyword:

Austenite Fabrication Ferrite Plasticity Stainless steel Strengthening (metal) Stress concentration

Community:

  • [ 1 ] [Zhao, Wei]School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou; 350108, China
  • [ 2 ] [Zhao, Wei]School of Zhicheng, Fuzhou University, Fuzhou; 350108, China
  • [ 3 ] [Xiang, Hongliang]School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou; 350108, China
  • [ 4 ] [Xiang, Hongliang]Mechanical and Electrical Engineering Practice Center, Fuzhou University, Fuzhou; 350108, China
  • [ 5 ] [Zhan, Xianming]School of Zhicheng, Fuzhou University, Fuzhou; 350108, China
  • [ 6 ] [Zhang, Xiangkai]School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou; 350108, China
  • [ 7 ] [Wu, Chaochao]School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou; 350108, China

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Materials Science and Engineering: A

ISSN: 0921-5093

Year: 2024

Volume: 901

6 . 1 0 0

JCR@2023

CAS Journal Grade:1

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count: 3

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 1

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