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Lecture

Aging response of an A357 Al alloy processed by Selective Laser Melting

Wednesday (08.11.2017)
11:40 - 12:00
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An Al-Si7-0,6Mg (type A357) alloy was investigated in order to evaluate its response to thermal aging after processing by selective laser melting (SLM). In particular, the three following main issues have been addressed in the research .

- The ability of the rapidly solidified SLM alloy to give a sufficient response to aging, starting from as built condition. For this purpose aging curves (evolution of hardness as a function of aging temperature and time) and differential scanning calorimetry (DSC) runs have been carried out to evaluate the aging behavior and aging sequence of SLM A357 alloy samples.

- The aging behavior according to a conventional treatment route. As built samples have been solution treated, water quenched and aged to investigate the aging kinetics and related strengthening precipitates. A comparison of the aging kinetics has been performed with standard cast alloys. In the evaluation of these results it has to be considered that maximization of the aging potential by a proper thermal sequence can be partially counterbalanced by the depletion due to high-temperature holding of the ultrafine cellular structure generated by the SLM solidification.

- The reaction of the SLM processed alloy to delayed aging phenomena. It is known that a delay in performing the aging treatment after the solutionizing phase can lead to significant depletion in achievable strengthening for some Al-Mg-SI alloys (the A357 alloy is amongst the most sensitive materials in this respect). This effect was here investigated either considering aging according to standard routes (i.e.: solution treatment, water quenching and artificial aging) and for aging performed starting from as built alloy condition.

The frame of data collected from research output allowed to draw scientific and practical information, of interest for the full exploitation of high strength light alloy parts produced by additive manufacturing techniques.

 

Speaker:
Dr. Riccardo Casati
Politecnico di Milano
Additional Authors:
  • Prof. Dr. Maurizio Vedani
    Politecnico di Milano

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