Abstract
This study forms part of the current research on modern steel groups with higher resistance to abrasive wear. In order to reduce the intensity of wear processes, and also to minimize their impact, the immediate priority seems to be a search for a correlation between the chemical composition and structure of these materials and their properties. In this paper, the correlation between prior austenite grain size, martensite packets and the mechanical properties were researched. The growth of austenite grains is an important factor in the analysis of the microstructure, as the grain size has an effect on the kinetics of phase transformation. The microstructure, however, is closely related to the mechanical properties of the material such as yield strength, tensile strength, elongation and impact strength, as well as morphology of occurred fracture. During the study, the mechanical properties were tested and a tendency to brittle fracture was analysed. The studies show big differences of the analysed parameters depending on the applied heat treatment, which should provide guidance to users to specific applications of this type of steel.
Highlights
The grain size has a measurable effect on most of the mechanical properties
At room temperature, the hardness, yield strength, tensile strength, fatigue strength, and impact strength all increase with decreasing grain size
A comparison of theGrowth austenite grain size attained after changing the temperature from 900, 1000
Summary
The grain size has a measurable effect on most of the mechanical properties. For example, at room temperature, the hardness, yield strength, tensile strength, fatigue strength, and impact strength all increase with decreasing grain size. This study analyzed the growth of austenite grains in, for example, Hardox 450, which is widely used in industry Another very important issue, from the point of view of the impact resistance level achieved in the low-alloy steels, is related to the type and morphology of the martensite structure. From the point of view of the static strength and the impact resistance of the low- and medium-carbon steel, their direct dependence on the size of blocks and packets, which constitute the effective dimensions of the martensitic structure in the meaning of the Hall-Petch relationship, has to be underlined. In relation to the above, in the opinion of the authors of this work, it is worth analyzing the morphology and size of the packets of martensitic structure while considering the impact of the grain size of the prior austenite on the selected mechanical properties of low-alloy steels with boron
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