Title

EFFECTS OF AUSTENITISING TEMPERATURES ON PRIMARY STRUCTURES TRANSFORMATION IN CAST HIGH-SPEED STEEL OF M2 TYPE

EFFECTS OF AUSTENITISING TEMPERATURES ON PRIMARY STRUCTURES TRANSFORMATION IN CAST HIGH-SPEED STEEL OF M2 TYPE

Authorship

CHAUS, ALEXANDER S.; BOHÁČIK, MICHAL; ÚRADNÍK, PETER; PORUBSKÝ, JÁN

CHAUS, ALEXANDER S.

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BOHÁČIK, MICHAL

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ÚRADNÍK, PETER

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PORUBSKÝ, JÁN

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DOI

10.5151/2594-5327-17044

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Abstract

The influence of heat treatment on the microstructure of AISI M2 type high-speed steels modified with powder additions of W and TiB2. The primary focus was on the effects of austenitising temperatures on the prior austenite grain size and size distribution, volume fraction and morphology of the eutectic carbides, MC and M6C, as well as character of the secondary precipitation of carbides in the high-speed steels studied. It was shown that austenitising significantly affects the changes in the chemical composition, morphology, size and character of distribution of the eutectic carbides in the high-speed steels studied, as well as the volume fraction of retained austenite in the matrix and prior austenite grain size. These changes in carbides seemed to be induced by a diffusion-induced redistribution of alloying elements between the steel matrix and carbide phases due to their mutual interaction at high temperatures, which is accompanied by carbide decomposition, coagulation and dissolution and, as consequence, saturation of solid solution by alloying elements.

The influence of heat treatment on the microstructure of AISI M2 type high-speed steels modified with powder additions of W and TiB2. The primary focus was on the effects of austenitising temperatures on the prior austenite grain size and size distribution, volume fraction and morphology of the eutectic carbides, MC and M6C, as well as character of the secondary precipitation of carbides in the high-speed steels studied. It was shown that austenitising significantly affects the changes in the chemical composition, morphology, size and character of distribution of the eutectic carbides in the high-speed steels studied, as well as the volume fraction of retained austenite in the matrix and prior austenite grain size. These changes in carbides seemed to be induced by a diffusion-induced redistribution of alloying elements between the steel matrix and carbide phases due to their mutual interaction at high temperatures, which is accompanied by carbide decomposition, coagulation and dissolution and, as consequence, saturation of solid solution by alloying elements.

Keywords

High-speed steel; Heat treatment; Microstructure; Properties.

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