29–30 Oct 2019
FHNW Brugg
Europe/Zurich timezone

In operando X-ray diffraction during laser 3D printing

29 Oct 2019, 14:10
5m
FHNW Brugg

FHNW Brugg

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Speaker

Samy Hocine (PSI - EPFL)

Description

Selective Laser Melting (SLM) is a well-known process category in Additive Manufacturing in which thermal energy selectively fuses regions of a powder bed. To investigate process parameters for metallic materials in-situ with synchroton X-rays, a miniaturized SLM device has been developped at PSI. The design of the miniaturized SLM device is determined by the requirements for X-ray access and implementability at different beamlines of synchrotron light sources. First in situ X-ray diffraction tests were performed successfully on Ti-6Al-4V samples at the MicroXAS and MS beamlines, located at the Swiss Light Source. By varying the laser power, scanning speed and hatch distance, various energy densities are obtained. The dynamics of the alpha and beta phases during fast heating and solidification are tracked with a time resolution of 50ms. This allows investigating the heating and cooling rates, and the size and shape of the heat affected zone.

Position Phd

Primary authors

Samy Hocine (PSI - EPFL) Prof. Helena Van Swygenhoven (PSI - EPFL) Dr Steven Van Petegem (Paul Scherrer Institut) Dr Cynthia Sin Ting Chang (Paul Scherrer Institut) Dr Tuerdi Maimaitiyili (Paul Scherrer Institut) Dr Gemma Tinti (Paul Scherrer Institut) Dr Dario Ferreira Sanchez (Paul Scherrer Institut) Dr Daniel Grolimund (Paul Scherrer Institut) Dr Nicola Pietro Maria Casati (Paul Scherrer Institut)

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