The EPMA Keynote Papers for Euro PM2019 are:
The Dimensions of Hardmetal Microstructures
Monday 14 October 2019 14:20 - 14:50 (Session 1: HM Microstructures) Room: 0.9
Dr José Garcia
Sandvik Coromant AB, Sweden
In this review selected cemented carbide and cermet microstructures are described. The focus is on microstructures, both those that are already established in the cemented carbide industry and those which have drawn scientific attention due to new potential applications. Cemented carbides are here divided in four groups based on microstructure and chemistry: WC morphology and chemistry, cubic carbide containing cemented carbide and cermets, functionally graded cemented carbides, and binder design of cemented carbides. The summary covers some historical background that motivated the microstructure design as well as the status of each class nowadays. The work aims at categorising cemented carbides in a structured way and to give an overview of cemented carbide microstructures for engineers, researchers and scientists.
Optimising Degassing of HIP Canisters – When is Enough Enough?
Monday 14 October 2019 14:20 - 14:50 (Session 2: Hot Isostatic Pressing) Room: 0.6/0.7
Dr Mark Taylor
The Manufacturing Technology Centre, United Kingdom
Effective degassing of HIP canisters is paramount to producing high quality components by prevention of the retention of atmospheric contaminants such as oxygen, nitrogen, hydrogen and argon. These contaminants are responsible for defects that lead to poor materials performance and reducing confidence in HIP products. The solution to degassing of large HIP canisters ready for processing is often met with extended degassing times to ensure adequate pump-down.
We present the use of residual gas analysis by spectroscopy for the enhancement of the degassing process and compare the amount of time required for degassing of different powders exposed to varied atmospheric conditions.
We consider the use of software to detect and notify users when degas is complete based on the residual gas analysis to shorten processing times for HIP parts, whilst ensuring quality.
Experimental Investigation and Numerical Simulation Analysis of Sintered Micro-fluidic Devices
Monday 14 October 2019 16:50 - 17:20 (Session 7: MIM Simulation and Process Conrol) Room: 0.2/0.3
Prof Thierry Barrière
Institut Femto-St/Applied Mechanic Lab, France
This paper investigates the use of numerical simulations to describe the solid-state diffusion of a sintering stage during a powder hot embossing process for micro-fluidic components with 316L stainless steel powders. Finite element analysis based on a thermo-elasto-viscoplastic model was established to describe the densification process of a stainless steel porous component during solid state sintering. The numerical analyses, which were performed on a 3D micro-structured component with different powder volume loading and specially to take into account the thermal debinding effect to propose a full debinding sintering simulation, demonstrated that the FE simulation results are in better agreement with the experimental ones.
Rheology of Powders: Assessing the Robustness and Impact of Humidity Charging Particle Size and Composition
Tuesday 15 October 2019 Time: 10:50 – 11:20 (Session 20: Powders for AM: Humidity and Storage) Room: 0.4
Mr Louis-Philippe Lefebvre
National Research Council Canada, Canada
Many powder metallurgy (PM) processes rely on powder flowability to ensure the productivity, stability of the process and the quality of the final parts. Different methods have been developed to quantify this property under different flow conditions (Hall/Carney flow, angle of reposes, powder rheometer, avalanche, etc.). Powder rheology (ex.: resistance seen by a blade when moving through a cylinder filled with powder) has recently generated interest in the PM community. In order to use the method for quality control, certification, simulation, and development R&D purposes, it is important to evaluate the robustness of the method and investigate the effect of experimental conditions and particle characteristics.
This paper presents an assessment of the variability of the results using a commercial rheometer and an evaluation of the impact of humidity, vessel, charging and powder characteristics (size distribution, and composition). Results were compared with values obtained using Hall/Carney and avalanches.
E-Forging™ AlSi10 and AlSi10Mg0.4 Powders with Two Distinct Particle Sizes
Wednesday 16 October 2019 13:50 - 14:20 (Session 52: New Processes) Room: 0.1
Dr Ing Alessandro Fais
Epos Srl, Italy
Electro-Sinter-Forging or E-Forging™ is a novel production technique that is gaining traction in different areas of manufacturing: from the production of parts in precious materials to diamond abrasives, from hard steel components to hardenable gears. In this work we present for the first time the results concering the consolidation to full density of aluminium powders. Two commercial grades have been chosen, AlSi10 and AlSi10Mg0.4, in two different granulometric distributions: