Neutron diffraction residual stress analysis and mechanical properties of additively manufactured high strength steel hollow sections

Yan，Ju Jie1,2; Li，Jian3; Yang，Zhao Long3; Gu，Rui Nan2; Yan，Ming2; Quach，Wai Meng1

2022-10-01

10.1016/j.tws.2022.109729

THIN-WALLED STRUCTURES   Impact Factor & Quartile

0263-8231

1879-3223

Selective laser melting (SLM) is regarded as one of the most attractive metal additive manufacturing (AM) techniques, which has offered a promising solution to fabricating unique members and can be used for a wide range of applications. However, the SLM is often associated with fast cooling rate and a resultant large thermal gradient; which may lead to a large amount of plastic strains and coexistent residual stresses, and sometimes even result in cracking and failure during the fabrication. These plastic strains and residual stresses play crucial roles in determining the mechanical performance of the produced structural members. Plastic strains cannot be directly measured but can be characterized indirectly by hardness values. Thus, it is essential to study the distributions and magnitudes of both residual stresses and hardness in SLM-fabricated members. In the present study, comprehensive experimental studies on micro-hardness, material properties and residual stresses in SLM-fabricated H13 high strength steel hollow sections were conducted. Non-destructive neutron diffraction was utilized to measure residual stresses and their distributions across the wall thickness and over the cross-sections. The effects of both scanning patterns and cross-section geometries on the residual stresses and hardness were also studied. Linear relationships between the hardness values and the material strengths were established for the additively manufactured H13 steel. The Vickers hardness value was found to be highly correlated to the ultimate strength, while it was correlated to the 0.2% tensile proof stress with a small deviation.

Hardness High strength steel Hollow sections Mechanical properties Residual stresses Selective laser melting

EI ; SCI

English

Corresponding

Fundo para o Desenvolvimento das Ciências e da Tecnologia[073/2015/A2];Fundo para o Desenvolvimento das Ciências e da Tecnologia[129/2014/A3];Science and Technology Planning Project of Guangdong Province[2017B090911003)];Science, Technology and Innovation Commission of Shenzhen Municipality[JCYJ20180504165824643];

Engineering ; Mechanics

Engineering, Civil ; Engineering, Mechanical ; Mechanics

WOS:000919359900001

ELSEVIER SCI LTD

20222912376499

Elasticity ; High strength steel ; Melting ; Microhardness ; Plastic deformation ; Selective laser melting ; Stress analysis ; Structural design

Structural Design, General:408.1 ; Steel:545.3 ; Reproduction, Copying:745.2 ; Chemical Operations:802.3 ; Materials Science:951

ENGINEERING

2-s2.0-85134247440

Scopus

1.Department of Civil and Environmental Engineering,University of Macau,Macau,China
2.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.Key Laboratory of Neutron Physics and Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics,Mianyang,621999,China

Yan，Ju Jie,Li，Jian,Yang，Zhao Long,et al. Neutron diffraction residual stress analysis and mechanical properties of additively manufactured high strength steel hollow sections[J]. THIN-WALLED STRUCTURES,2022,179.

Yan，Ju Jie,Li，Jian,Yang，Zhao Long,Gu，Rui Nan,Yan，Ming,&Quach，Wai Meng.(2022).Neutron diffraction residual stress analysis and mechanical properties of additively manufactured high strength steel hollow sections.THIN-WALLED STRUCTURES,179.

Yan，Ju Jie,et al."Neutron diffraction residual stress analysis and mechanical properties of additively manufactured high strength steel hollow sections".THIN-WALLED STRUCTURES 179(2022).