13th International Conference on the Technology of Plasticity (ICTP 2021): Metal Forming Process I
Program Organizers: Glenn Daehn, Ohio State University; Libby Culley, The Ohio State University; Anupam Vivek, Ohio State University; Jian Cao, Northwestern University; Brad Kinsey, University of New Hampshire; Erman Tekkaya, TU Dortmund; Yoshinori Yoshida, Gifu University
Monday 10:20 AM
July 26, 2021
Room: Virtual: Room B
Location: Virtual
Session Chair: Elisabeth Massoni, CEMEF MINES ParisTech
Innovative Simulation Strategy for the Mastering of Tribological Surface Transformations: Mirentxu Dubar1; Laurent Dubar1; Hans Boungomba1; Philippe Moreau1; Cédric Hubert1; 1LAMIH UMR CNRS 8201
Reducing energy consumption and improving vehicle comfort has pushed car manufacturers to develop components that combine high mechanical performance and optimum lightness. Concerning the specific case of suspensions parts manufacturing, the materials involved require high mechanical characteristics coupled to a good ability to plastic deformation. These specifications imply severe conditions during forming, leading to tribological surface transformations in the case of springs. The aim of this work is to master these transformations by FEM modeling and refined material investigations (SEM, residual stresses and hardness). The 3D FEM model is made with ABAQUS, considering kinematic hardening effect on the one hand, and on the other hand tribological data. The interfacial characteristics have been obtained by means of a specific testing bench, able to reproduce industrial contact conditions. The mechanical variables of the model are coupled with a specific damage model in order to correlate to the metallurgical surface transformations.
Methods for Increasing the Durability of Forging Tools - Comprehension Review and Outlook: Zbigniew Gronostajski1; Pawel Widomski1; Marcin Kaszuba1; 1Wroclaw University of Science and Technology
The problem of the low durability of hot forging tools is widely known and undergoes many particular research actions. Most often these studies have a narrow range of case studies instead of a universal approach. It was found that there is no single multifunctional method for increasing durability, but general directions for improving durability should be considered.Currently, the main directions of durability improvement are surface engineering technologies, especially layers and coatings increasing wear resistance. Among them, hybrid solutions predominate, involving the use of several techniques on one tool in order to synergistically interact and obtain higher wear resistance. In this work, the results of many studies from the last several decades are gathered to present the possibilities of increasing the tool life in forging processes. The available methodologies, systems and approaches for selecting methods of durability improvement were also analyzed and their effectiveness evaluated.
Effect of Blanking on Magnetic and Mechanical Properties of Non-oriented Electrical Steel: Ronggao Cui1; Shuhui Li1; Ji He1; 1Shanghai Jiao Tong University
World-wide blanking is the most popular technique for producing the non-oriented electrical steel lamination. However, blanking has a great effect on magnetic property and mechanical property, such as the introduction of uneven residual stress, the deterioration of magnetic properties and the increase of micro-hardness. In this research, non-oriented electrical steel sheets are investigated via blanking test by 3 kinds of punches. The blanking edges are examined by the optical microscopy and micro-hardness test to visualize the distribution of micro-hardness. The magnetic properties are also measured. The results show that the blanking clearance has a great influence on magnetic properties and mechanical properties of the blanked material.
Impact of the Temperature Field of a C38 Steel Slug on its Thixoforging: Experiments and Simulations: Eric Becker1; 1Arts et Métiers Institue of Technology
The thixoforging forming process for steels makes it possible to produce complex shaped parts near netshape, or very close, in one step with a very low forging force compared to the conventional forging process. To obtain an optimal thixoforged product, it is necessary to have a mastery of the process parameters. The heating stage of the steel slug is a major phase in this process. It makes it possible to obtain a partially semi-solid billet allowing the thixoforging of the latter but also its prehension for transfer to the press. The article presents the temperature field in the volume of the semi-solid C38 steel billet obtained by experimental measurements and simulations. Under these conditions of heating the billets, it also shows the characteristics of the parts obtained, fibering and micrographs, and shaping, the necessary thixoforging force.
Influence of Precoating on the Decarburization of the Surface Layer of Forged Parts during the Hot Die Forging Process: Zbigniew Gronostajski1; Pawel Widomski1; Marcin Kaszuba1; Maciej Zwierzchowski1; 1Wroclaw University of Science and Technology
This research evaluates the effect of pre-coating of forged parts on decarburization. First, the effect of different coatings on the rods decarburization during the induction heating process was tested. Coatings were deposited before forging. Once completed testing, the measurements and observations of the decarbonized layer were made. The next stage involved analysis of the decarburization of the forged parts after forging. The forged parts were made using precoating of pre-forging elements; pieces cut off a metal rod. Based on tests results, the possibility of using this solution in the technique of industrial hot forging was evaluated. The results of laboratory tests have confirmed that lubrication of metal pieces is sufficient, as well as proved it to be effective in reducing decarburization of the surface layer. Results indicate that decarburization may be reduced to a minimum when we use Bonderite product in a concentration of 66% and 50%.
Experimental Study of Asymmetric Rolling of Aluminum Alloys: Gabriela Vincze1; Marilena Butuc1; Augusto Lopes1; 1University of Aveiro
In this work, the effect of asymmetric rolling parameters on the mechanical properties of two aluminum alloys was investigated. The asymmetric rolling (ASR) process is known as a process capable to improve the properties of the material through microstructure refinement and development of a shear component of texture that leads to an improvement of strength and plastic anisotropy. An asymmetric mill equipped with two identical rolls commanded by independent motors was used to analyze the effect of reduction per pass, asymmetry factor and the rolling route. The two materials, AA6022 and AA6061, modified by ASR, were analyzed by uniaxial tensile test, hardness test and Electron Backscatter Diffraction technics. It was observed a strong increase of yield stress and ultimate tensile strength in detriment of formability, being more accentuated for AA6061 compared to AA6022. Regarding the texture evolution, shear texture components are linked to a higher reduction per pass.