Effect of heat treatment on the microstructure and anisotropy in mechanical properties of A357 alloy produced by selective laser melting
By Kun Yang, P. Rometsch, Chris Davies, A. Huang, Xinhua Wu. Materials & Design (1980-2015), 2018
212 citations recorded by the source corpus.
Abstract A357 alloy was manufactured by selective laser melting (SLM) and subjected to different heat treatments, by considering the stress relief step as critical, to establish the microstructure-mechanical property relationship and model the yield strength. For the as-SLM processed condition, the imposed fast cooling rate refines and limits the amount of Fe-rich intermetallic and eutectic Mg2Si phases, and enables a higher level of supersaturation of solutes. The latter leads to significant yield strength contributions from solid solution strengthening and natural ageing. The inter-cellular Si network within the columnar grains remains unchanged but small Si-rich particles appear within cells after direct ageing. The Si network breaks up during stress relieving, leading to high ductility. The lower ductility for the vertically-built samples under as-SLM processed, directly aged, and stress relieved conditions is due mainly to the finer Si networks brittle nature. Porosity resulting from trapped hydrogen gas enlarges significantly with solutionisation, deteriorating the ductility. Grain growth is not obviously observed with heat treatment. Si particles coarsen preferentially at grain boundaries initially, however, they distribute more evenly by coarsening within the grains as well during prolonged solutionisation. Anisotropy in both yield strength and ductility subsequently disappears when a more homogeneous microstructure is obtained.
Subfields: Automotive Engineering, Mechanical Engineering
View Paper: https://www.semanticscholar.org/paper/3ac04def4cbd8f8e27f80dd51d19d3a29bcf62c0
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Citations in the corpus
- Effects of Platform Pre-Heating and Thermal-Treatment Strategies on Properties of AlSi10Mg Alloy Processed by Selective Laser Melting (2018, background): “Such behavior is supposed to be due to peculiar crystal orientation of the elongated solidification grains (containing the above described cellular substructure) that produce an anisotropic effect in material behavior [4,19], and to possible preferential location of small defects at laser track boun”