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.
Influence Of Heat Treatment And Densification On The Load Capacity Of Sintered Gears - Mr Scholzen Philipp (Laboratory for Machine Tools and Production Engineering (WZL) of RWTH Aachen University, Germany)
Topic: Applications
Session 4: Applications – Automotive - Monday 18 October 2021 – 11:15 – 12:45
Title: Influence Of Heat Treatment And Densification On The Load Capacity Of Sintered Gears
Abstract: The Powder Metallurgical manufacturing of gears offers a promising opportunity in terms of reducing the noise emission and increasing the power density. Sintered gears weigh less than conventional gears and potentially have a better noise‑vibration‑harshness behavior, due to the remaining porosity. However, the potential of sintered gears for highly loaded applications is not fully utilized yet. Six variants of surface densified and case‑hardened sintered gears from Astaloy Mo85 are tested to analyze the impact of the densification and case hardening depths on both the tooth root and flank load bearing capacities. Experimental investigations including metallography and computer tomography are carried out to characterize the microstructure. Furthermore, a simulation model is developed to quantitatively describe the residual stress and hardness profiles after the heat treatment. The load bearing capacity was improved by increasing the densification and case hardening depths, where the effect of the case hardening was identified to be predominant.
Binder-Jetting Of TiCN-based Cermets - Dipl-Ing Berger Christian (Fraunhofer IKTS, Germany)
Topic: Consolidation technologies
Session 41: AM Sinter Based Technologies: Binder Jetting- Thursday 21 October 2021 – 13:00 - 14:30
Title: Binder-Jetting Of TiCN-based Cermets
Abstract: Additive Manufacturing is experiencing an upswing in many sectors of industry for a broad variety of materials. Processes are mainly developed for polymers and metals. For ceramics, hardmetals and especially cermets there are only a few additive processes suitable. The powder-based technique Binder-Jetting is one of these suitable processes with high productivity and relatively low green density. Within this study TiCN-based cermets are printed by Binder-Jetting for the first time. The complexity of influences of the morphology and composition of cermet powders are discussed in regard to bulk density and material properties of printed and sintered parts. Studied TiCN-based cermet compositions represent different Ni and Mo2C binder contents. Main points of this investigation are further the adjustment of ratio of the raw materials for good sintering behaviour and their influence on the microstructures and as a function of varied sintering temperatures.
Effects Of Processing Defects On Damage Tolerance Of Sintered Beta Titanium Alloys Under Static And Dynamic Loading - Dipl-Ing Xu Peng (Helmholtz-Zentrum Geesthacht, Germany)
Topic: Materials
Session 13: Non Ferrous & Ferrous Materials – Tuesday 19 October 2021 – 10:45 – 12:15
Title: Effects Of Processing Defects On Damage Tolerance Of Sintered Beta Titanium Alloys Under Static And Dynamic Loading
Abstract: (Metastable) β titanium alloys are key materials in lightweight and biomedical applications, due to the combination of excellent mechanical properties and paramount biocompatibility. Unfortunately, binder-based sintering techniques like MIM (Metal-Injection-Molding), Binder Jetting or Fused Filament Fabrication, normally introduce three major processing defects in the as-sintered Ti-parts: i) residual porosity, ii) high impurity level and iii) coarse-grained structure. The previous studies revealed that these defects invariably tend to be even more severe in β titanium alloys than in Ti-6Al-4V fabricated by powder metallurgy route.In the first part of this article, these processing-related defects and their likely origins in sintered β titanium alloys are reviewed. In the second part, the effects of these defects on fracture mechanisms of sintered β titanium alloys under static or dynamic loading are analyzed. Based on the analyses, strategic technical improvements in the processing to improve the reliability of sintered β titanium alloys products are proposed.
High Entropy Based Hardmetals - Dr Ing Pötschke Johannes (Fraunhofer IKTS, Germany)
Topic: Materials
Session 37: Alternative Hardmetals – Thursday 21 October 2021 – 10:45 – 12:15
Title: High Entropy Based Hardmetals
Abstract: Hardmetals, cemented carbides or cermets are made conventionally from single carbide hard phases like WC, TiC or TiCN. Especially in cermets also more complex hard phases such as (Ti,Nb,Ta)C exist. Furthermore, metal binders used are commonly single metal elements like Co or Ni as well as alloyed mixtures of them with other elements. Within this work, high entropy based hard phases like (Ta,Nb,Ti,V,W)C and high entropy metal binder phases were studied separately as well as together in novel double high entropy based hardmetals. The microstructural, magnetic, and mechanical properties are discussed and are compared to conventional WC-Co based hardmetals as well as to TiCN-CoNi based cermets. XRD results showed that it is possible to retain the high entropy metal phase as well as the high entropy hard phase after sintering.
A Finite Element Based Model Of The Influence Of Density On PM Mechanical Properties - Dr Andersson Michael (Höganäs AB, Sweden)
Topic: Tools for improving PM
Session 47: Design and modelling – Friday 22 October 2021 – 09:00 - 10:30
Title: A Finite Element Based Model Of The Influence Of Density On PM Mechanical Properties
Abstract: The finite element method is a powerful tool to, for instance, calculate stresses and strains in components. But it can also be used as a tool for material design. For PM steels the porosity has a strong impact on the strength of the materials. Therefore it’s important to understand the connection between porosity an mechanical properties to utilize the materials in the most efficient way.In this paper it’s investigated how finite element simulations can be used to model the tensile test curve of a PM steel, and estimate properties at different densities. A metallographic investigation of the pore- and micro structures of the material is combined with a model of the strain hardening of the matrix material into a finite element model. The tensile curves, as a function of density, are then simulated using the computer model, and finally compared with experimental data.
