Advanced Functional and Structural Thin Films and Coatings & Honorary Palkowski Session: Honorary Palkowski Session I
Sponsored by: TMS Functional Materials Division, TMS: Thin Films and Interfaces Committee
Program Organizers: Gerald Ferblantier, University of Strasbourg - IUT LP / ICube Laboratory - CNRS; Adele Carrado, University of Strasbourg; Ramana Chintalapalle, University of Texas at El Paso; Karine Mougin, Cnrs, Is2m; Ravindra Nuggehalli, New Jersey Institute of Technology; Heinz Palkowski, Clausthal University of Technology
Monday 8:30 AM
March 20, 2023
Room: Aqua E
Location: Hilton
Session Chair: Ravindra Nuggehalli, New Jersey Institute of Technology; Gérald Ferblantier, University of Strasbourg, ICube Laboratory, CNRS; Adele Carrado, University of Strasbourg, IPCMS, CNRS
8:30 AM Introductory Comments
8:45 AM Invited
Thermal Fatigue of Spheroidal Graphite Cast Iron: Primoz Mrvar1; Mitja Petric1; Milan Tercelj1; 1University of Ljubljana
Using high Si spheroidal graphite cast iron (SGI) thermal fatigue tests at temperature of 600 ºC were carried out. Surface layer degradation on test samples was studied, i.e., degradation of graphites, initiation and growth of cracks in relation to specific characteristics of graphites as well as oxidation process. Special attention was devoted to oxidation progress of degenerated graphite nodules (complex structured graphite that contains also small ferrite particles) whereas their oxidation rate is accelerated in comparison to usual graphite nodules. Crack initiation and growth is accelerated in case of successive arrangement of graphite, by process of graphite-matrix debonding. Complex process of oxidation is related to characteristics of graphite particles as well as their distribution in matrix.
9:15 AM
Reduction of Friction and Adhesion in Copper and Brass Extrusion by Application of Boron Containing Surface Modifications: Stefan Lechner1; Alexander Thewes2; Soeren Mueller1; 1Extrusion Research and Development Center FZS, TU Berlin; 2Institute for Surface Technology, TU Braunschweig
Due to extensive abrasion and adhesion, tools for copper and brass extrusion are subject to considerable wear. In the present study, the effect of boron containing surface modifications on friction and adhesion was investigated by means of a high temperature, high speed friction test for extrusion. A Ti-Si-B-C-N nanocomposite coating and a boridic diffusion layer were applied to hot work tool steel 1.2367 and nickel-based alloy 2.4668, respectively. Using billets made of copper alloy CW024A and brass alloy CW724R, the friction tests were performed at high temperatures and normal pressures typical of the extrusion process. The evaluation of the obtained test data indicates a significant influence of the Ti-Si-B-C-N nanocomposite coating on the friction and adhesion behavior of the investigated material pairings. While friction and adhesion are greatly reduced for the Ti-Si-B-C-N coating, the effect of the boridic diffusion layer is substantially less.
9:35 AM Cancelled
In-Situ Alloy Formation during Selective Laser Melting with CuSn10 and Aluminum Powders: Farzad Foadian1; Robert Kremer1; 1Dortmund University of Applied Sciences and Arts
Thanks to metal additive manufacturing (AM), the way metal parts are made has changed in recent decades. Almost unlimited designs are possible, and local material properties such as microstructural properties can be realized through regional process variations. Although many scientists and engineers have worked and are working on AM and their efforts have led to the commercialization of AM metal technologies, the effort required to create new and customized alloys is still high. This is due to the fact that a completely created alloy has to be brought into the powdered initial form before it can be manufactured, which involves quite a lot of effort. In-situ alloys can remedy this situation by mixing powder particles of different materials with each other before production and the actual target material is only created during the production process when it is melted by the laser beam. This paper gives a brief overview of the in-situ alloying of a CuAl12Sn9 alloy by selective laser melting of CuSn10 and pure aluminum powder.
10:05 AM Break
10:20 AM Invited
Prediction of Grain Size Evolution during Hot Rolling of HSLA Steels Considering Precipitation: Goran Kugler1; Jan Foder2; Boštjan Bradaškja2; David Bombač1; 1University of Ljubljana; 2SIJ Acroni d.o.o.
A physical-based model for predicting grain size evolution during multi-pass hot rolling of HSLA steels has been developed, consisting of two coupled modules. The first is a microstructure module based on modeling the interaction of an ensemble of multiple grains. It considers strain hardening, dynamic recovery, and dynamic recrystallization during plastic deformation, as well as static recovery, static recrystallization, metadynamic recrystallization, and grain growth after straining. In the second module, the KWN multiclass approach was used together with classical nucleation theory for simulations of precipitation kinetics during thermomechanical processing. The parameters of the model were obtained through extensive experiments with the Gleeble-machine, thermodynamic calculations with Thermo-Calc software, and microstructural characterizations of selected HSLA steel-grades. A user-friendly application for simulating the hot rolling schedule was developed for industrial use. The results of the simulations show a good predictability of the simulation system compared to industrial results for different hot rolling schedules.