The Effect of Stress Relief on the Mechanical and Fatigue Properties of Additively Manufactured AlSi10Mg Parts

被引:53
作者
Mfusi, Busisiwe J. [1 ,2 ]
Mathe, Ntombizodwa R. [2 ]
Tshabalala, Lerato C. [2 ]
Popoola, Patricia A., I [1 ]
机构
[1] Tshwane Univ Technol, Dept Chem & Met Engn, Staatsartillerie Rd, ZA-0183 Pretoria, South Africa
[2] CSIR, Natl Laser Ctr, Meiring Naude Rd, ZA-0185 Pretoria, South Africa
基金
新加坡国家研究基金会; 芬兰科学院;
关键词
selective laser melting (SLM); Alsi10Mg; stress relieve; additive manufacturing; HEAT-TREATMENT; LASER; FRACTURE; MICROSTRUCTURE; ALLOY; STRENGTH; PREDICTION;
D O I
10.3390/met9111216
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The heating and cooling profiles experienced during laser additive manufacturing results in residual stresses build up in the component. Therefore, it is necessary to perform post build stress relieving towards the retention and improvement of the mechanical properties. However the thermal treatments for conventional manufacturing do not seem to completely accommodate these rapid heating and cooling cycles of laser processing techniques such as powder bed fusion. Characterizations such as density measurements on the samples were performed employing the Archimedes principle; hardness testing was performed on the Zwick micro/macro (Hv) hardness tester, SEM and Electron backscatter diffraction (EBSD). Fracture toughness and crack growth was conducted on a fatigue crack machine. All characterization was done after stress relieving of Selective Laser Melting (SLM) produced samples at 300 degrees C for 2 hrs was performed in a furnace. The mechanical properties appear to be rather compromised instead of being enhanced desirably. As-built SLM produced tensile specimens built in different directions exhibited significantly favorable mechanical properties. However, post stress relieve thermal treatment technique deteriorated the strength while increasing the ductility significantly. Nonetheless, fatigue crack growth and fracture toughness illustrated positive outcome in terms of fatigue life on SLM produced AlSi10Mg components in application.
引用
收藏
页数:15
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