Effect of Quenching Heat Treatment on Microstructure and Properties of High-Boron High-Speed Steel for Rolls
Author of the article:YANG Zhiqiang;GUO Hongxing;YU Weiwei
Author's Workplace：School of Electrical,Kunming Vocational and Technical College of Industry,Anning 650302,China;Yunnan KJSC Heavy Equipment Manufacturing Group Co.,Ltd.,Anning 650302,China
Key Words：high boron high speed steel quenching temperature boro-carbide hardness wear resistance
Abstract：The effect of quenching temperature on microstructure and properties of high boron high-speed steel for roll was studied by optical microscope,scanning electron microscope,X-ray diffraction,hardness tester and MM-200 wear tester.The results show that the microstructure of as-cast high boron high-speed steel is composed of martensite,ferrite,pearlite and eutectic borocarbons distributed in a continuous network along the grain boundary.The eutectic borocarbons are mainly M2 B and M7(C,B)3.With the increase of quenching temperature,the matrix is transformed into martensite,and secondary boron carbide M23(C,B)6 is precipitated.The hardness and wear resistance of high boron high-speed steel increase obviously with the increase of quenching temperature.The hardness and wear resistance are the highest when quenched at 1150℃.
