Keynote papers receive an extended oral presentation slot in the programme and will go on to be published in the journal Powder Metallurgy who sponsor the Award. (logo)
The EPMA Keynote Papers for Euro PM2022 are:
Microstructure Control Of Additively Manufactured IN718 By L-PBF Process - Ing Lacoste Luc (Mines ParisTech - Centre des matériaux - PSL University - AddUp - Additive Factory Hub (AFH), France)
Topic: Consolidation technologies
Session 23: AM Beam Based Technologies: Nickel-Based Materials|Refractory Metals– Wednesday 20 October 2021 – 09:00 - 10:30
Title: Microstructure Control Of Additively Manufactured IN718 By L-PBF Process
Abstract: Additively manufactured (AM) parts typically exhibit large columnar grains and preferential crystallographic texture. While such microstructure can have beneficial effects, for instance on creep properties, the resulting mechanical anisotropy remains a key issue for most applications of AM critical parts. The link between solidification conditions and molten pool morphology of Inconel 718 manufactured with laser powder bed fusion (L-PBF) have been investigated in order to tailor the microstructural features of parts with respect to their applications. Thanks to process optimization, it is possible to reduce the texture index by a factor 10 and the grain size from millimeter-scale to 5 times smaller than layer thickness. Furthermore, it is possible to obtain grain aspect ratio and circularity comparable to a forged equiaxed material. Those achievements pave the way to produce fully isotropic and|or controlled anisotropic parts by L-PBF process.