Influence of Annealing on Mechanical Properties of Al-20Si Processed by Selective Laser Melting

Metals

Konda G. Prashanth¹  Jürgen Eckert¹  Sergio Scudino¹  Hongwei Wang²  Zunjie Wei²  Pan Ma²  Yandong Jia²  Chunming Zou² 

[1] IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany;School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;

关键词: Al-20Si alloy;    selective laser melting (SLM);    heat treatment;    microstructure;    mechanical properties;   

DOI  :  10.3390/met4010028

来源: DOAJ

【 摘 要 】

The microstructure and mechanical properties of Al-20Si produced by selective laser melting (SLM) are investigated for different heat treatment conditions. As a result of the high cooling rate during processing, the as-built SLM material displays a microstructure consisting of a supersaturated Al(Si) solid solution along with heavily refined eutectic Si and Si particles. The Si particles become coarser, and the eutectic Si gradually changes its morphology from fibrous to plate-like shape with increasing annealing temperature. The microstructural variations occurring during heat treatment significantly affect the mechanical behavior of the samples. The yield and ultimate strengths decrease from 374 and 506 MPa for the as-built SLM material to 162 and252 MPa for the sample annealed at 673 K, whereas the ductility increases from 1.6 to 8.7%. This offers the possibility to tune microstructure and corresponding properties of the Al-20Si SLM parts to meet specific requirements.

【 授权许可】

Unknown