[Kovove materialy - Metallic materials]
    Mon - November 11, 2024 - 01:14 No. of hits : 1797361 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 51 (2013), Issue 3

Effect of heat treatment on structure and properties of B alloyed high speed steel for rolling mill rolls
FU, H., DU, Z., JIANG, Y., LI, P., ZHOU, R., CEN, Q., LEI, Y., XING, J.
vol. 51 (2013), no. 3, pp. 189 - 196
DOI: 10.4149/km_2013_3_189

Abstract
Solidification structure of two kinds of B alloyed high speed steel for rolling mill rolls, which carbon contents are 0.50% and 1.00% respectively, and the changes in the microstructure and mechanical properties after quenching from 1050 °C and tempering at 200-600 °C respectively are studied. The results of metallographic, scanning electron microscopy analyses, X-ray diffraction analyses, hardness and impact toughness measurements of as-cast and heat-treated B alloyed high speed steel are discussed. As-cast matrix of B alloyed high speed steel consists of martensite and troostite. There are 19-26 vol.% M23(B,C)6, M3(B0.7C0.3) and M2(B,C) type carboborides in the matrix. Microhardness of M23(B,C)6, M3(B0.7C0.3) and M2(B,C) are 1940-2030Hv, 1380-1460Hv and 1460-1530 Hv respectively. Macrohardness of as-cast B alloyed high speed steel reaches 58-60 HRC. After quenching from 1050 °C, the eutectic M23(B,C)6 and M3(B0.7C0.3) carboborides dissolve into the matrix, and many granular M23(B,C)6 precipitate from the matrix, and the whole matrix transforms into martensite. Microhardness of matrix and macrohardness of quenched B alloyed high speed steel have a slight increase comparing with as-cast sample. Hardness of the B alloyed high speed steel remains constant while tempering temperature is below 550 °C, and then, with increasing temperature, decreases considerably. Impact toughness of the B alloyed high speed steel increases slightly until tempering temperature reaches 525 °C, and then increases considerably. B alloyed high speed steel has higher hardness and will have excellent wear resistance after tempering under 550 °C that can be attributed to the effect of boron.

Key words
High speed steel for rolling mill roll, B alloyed steel, carboboride, quenching; tempering, hardness, impact toughness

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Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
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