Home FOR AUTHORS Kovove Materialy-Metallic Materials 2013 Metallic Materials Vol. 51 (2013), no. 3, pp.189-196

Journal info

Select Journal







Webshop Cart

Your Cart is currently empty.

Info: Your browser does not accept cookies. To put products into your cart and purchase them you need to enable cookies.

Metallic Materials Vol. 51 (2013), no. 3, pp.189-196

Title: Effect of heat treatment on structure and properties of B alloyed high speed steel for rolling mill rolls
Author: H. FU, Z. DU, Y. JIANG, P. LI, R. ZHOU, Q. CEN, Y. LEI, J. XING

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.

Keywords: High speed steel for rolling mill roll, B alloyed steel, carboboride, quenching; tempering, hardness, impact toughness
Published online: 20-Sep-2017
Year: 2013, Volume: 51, Issue: 3 Page From: 189, Page To: 196
doi:10.4149/km_2013_3_189


download file



© AEPress s.r.o
Copyright notice: For any permission to reproduce, archive or otherwise use the documents in the ELiS, please contact AEP.