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Conformal thermostating of high-pressure die castings with the increased tightness

Figurski Krzysztof, Pasierb Łukasz, Piekło Jarosław, Burbelko Andriy

Polish Technical Review

2024

No. 1

2--7

In the paper, the exemplary concept, together with the analysis of the obtained results from the experimental trials of thermostating using the conformal system in the cold-chamber high-pressure die casting process of aluminium alloy, was described. Construction of the experimental system of thermostating channels, mapping the surface of the cavity, as being placed in the core, shaping the internal geometry of casting with a required increased tightness was performed. The results of the numerical simulations for a given case and the results of the experiments and RTG examinations of the castings made on a real system, utilizing the designed cores, performed in increment technology from steel 1.2709 were submitted.

W pracy przedstawiono przykładową koncepcję wraz z analizą otrzymanych wyników z prób eksperymentalnych dla konformalnego układu termostatowania odlewniczej formy wysokociśnieniowej do odlewania zimnokomorowego stopów aluminium. Dokonano konstrukcji doświadczalnego układu kanałów termostatujących odwzorowujących powierzchnię wnęki formy, umieszczonych w rdzeniu kształtującym wewnętrzną geometrię odlewu o wymaganej podwyższonej szczelności, przedstawiono wyniki symulacji numerycznych dla zadanego przypadku oraz wyniki doświadczeń oraz badań RTG odlewów wykonanych na rzeczywistym układzie wykorzystującym zaprojektowane rdzenie wykonane w technologii przyrostowej z stali 1.2709.

Analysis of Failure Process of Maraging Steel Produced by Selective Laser Melting (SLM)

Piekło Jarosław, Garbacz-Klempka Aldona

Archives of Metallurgy and Materials

2022

Vol. 67, iss. 3

1107--1116

An investigation of the failure process of maraging steel grade X3NiCoTi18-9-5 produced by the SLM method that is subjected to various three-dimensional stress-states has been carried out. In this paper, deformations and damage evolution are analysed experimentally and numerically. Three microstructures of the SLM steel were obtained after the appropriate heat treatment. Tensile tests of smooth specimens and axisymmetric notched specimens have been performed. Numerical models of the samples with ring notches were made in order to determine the stress state and displacement field in the notch area at the moment of the sample’s breakage as well as to compare the experimentally determined effective strain in the notch after the sample’s breakage with the deformation being calculated on the basis of the numerical solution. As a result of the research, it was found that the type of fracture of samples obtained from X3NiCoTi18-9-5 steel powder by the SLM method depends on the size of the ring notch’s radius. Based on the performed numerical calculations and experimental tests, it was found that, for each of the analysed variants of heat treatment, it was possible to indicate the approximate limit value of triaxiality factor Tf, above which there is a scrap of brittle X3NiCoTi18-9-5 steel produced by the SLM method. This value is determined by the characteristic bending of the function that determines the relationship between triaxiality factor Tf and effective strain eeff.