Browsing by Subject "bainite"

Now showing 1 - 2 of 2

Access status: Open Access ,
Bainite transformation time model optimization for Austempered Ductile Iron with the use of heuristic algorithms
(Wydawnictwa AGH, 2022) Olejarczyk-Wożeńska, Izabela; Opaliński, Andrzej; Mrzygłód, Barbara; Regulski, Krzysztof; Kurowski, Wojciech
The paper presents the application of heuristic optimization methods in identifying the parameters of a model for bainite transformation time in ADI (Austempered Ductile Iron). Two algorithms were selected for parameter optimization - Particle Swarm Optimization and Evolutionary Optimization Algorithm. The assumption of the optimization process was to obtain the smallest normalized mean square error (objective function) between the time calculated on the basis of the identified parameters and the time derived from the experiment. As part of the research, an analysis was also made in terms of the effectiveness of selected methods, and the best optimization strategies for the problem to be solved were selected on their basis.
Access status: Open Access ,
Effect of the cooling rate on the mottled cast iron microstructure designed for the mill rolls
(2009) Krawczyk, Janusz Ryszard; Pacyna, Jerzy
The influence of the cooling rate changes on the mottled cast iron microstructure was described in the paper. The investigated material constituted mottled cast iron, spheroidal, chromium-nickel. This cast iron, according to currently binding standards was marked GJS-HV300(SiCrNi2-3). The microstructure was described both qualitatively and quantitatively. The discussion of the formation mechanisms and their influence on the morphology of structural components and phases was conducted. The heat treatment was performed in such a way as to obtain either a pearlitic or a bainitic matrix as well as a different morphology of lederburitic cementite and graphite precipitates for the same matrix.