In situ X-ray tomography of fracture behaviour in low-porosity L-PBF AlSi10Mg alloy with laser shock peening

被引：12

作者：

Wu, Zhengkai ^{[1
]}

Wu, Shengchuan ^{[1
,5
]}

Duan, Yusong ^{[2
]}

Huang, Ke ^{[2
,6
]}

He, Wentao ^{[1
]}

Du, Dafan ^{[3
,4
]}

Dong, Anping ^{[3
,4
,7
,8
]}

机构：

[1] Southwest Jiaotong Univ, State Key Lab Rail Transit Vehicle Syst, Chengdu, Peoples R China

[2] Xi An Jiao Tong Univ, Sch Mech Engn, State Key Lab Mech Mfg Syst, Xian, Peoples R China

[3] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai Key Lab Adv High Temp Mat & Precis Formin, Shanghai, Peoples R China

[4] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Met Matrix Composites, Shanghai, Peoples R China

[5] Southwest Jiaotong Univ, State Key Lab Rail Transit Vehicle Syst, Chengdu 610031, Peoples R China

[6] Xi An Jiao Tong Univ, Sch Mech Engn, State Key Lab Mech Mfg Syst, Xian 710054, Peoples R China

[7] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai Key Lab Adv High Temp Mat & Precis Formin, Shanghai 200240, Peoples R China

[8] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China

来源：

VIRTUAL AND PHYSICAL PROTOTYPING | 2023年 / 18卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Additive manufacturing; AlSi10Mg alloys; laser shock peening; X-ray tomography; internal defect evolution; MECHANICAL-PROPERTIES; HEAT-TREATMENT; MICROSTRUCTURE; DEFECTS; DUCTILITY; STRENGTH; FATIGUE; AM;

D O I：

10.1080/17452759.2023.2273955

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this study, we employed a novel hybrid AM process, in which periodic laser shock peening (LSP) treatments were added to the standard laser powder bed fusion (L-PBF) process, for fabricating the AlSi10Mg alloy. As a result, the porosity of the alloy was reduced by approximately 90%. To monitor damage evolution, we conducted in situ tensile tests using high-resolution synchrotron radiation X-ray micro-computed tomography. The results indicate that in the LSP-treated L-PBF AlSi10Mg alloy, with a porosity of around 0.05%, the plasticity of vertical tensile samples significantly increases, and the fracture strain closely resembles that of the horizontal sample. The reduction in porosity results in increased spacing between adjacent defects, which decreases the interaction between defects. Consequently, the rapid fracture caused by the merge of large defects is prevented. Notably, micro-cracks observed in the vertical samples before tensile fracture primarily originates at the molten pool boundaries rather than from defects.

引用

页数：16

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