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Transactions of the Indian Institute of Metals

, Volume 71, Issue 10, pp 2423–2432 | Cite as

Effect of Heat Treatment on Microstructure and Properties of High Boron-High Speed Steel

  • Han-guang Fu
  • Xiao-ni Liu
  • Yong-wei Yang
  • Xiao-le Cheng
  • Yin-hu Qu
Technical Paper
  • 37 Downloads

Abstract

A new type of high boron-high speed steel (HB-HSS) with different boron content was selected for oil quenching at 1050 °C, and different temperature of tempering treatment was chosen. By using optical microscopy, scanning electron microscopy, X-ray diffraction, Rockwell hardness tester, red hard treatment and wear test, the effects of heat treatment on microstructure and properties of HB-HSS were investigated. The experimental results indicate that the quenching microstructure of HB-HSS consists of α-Fe, M2(B, C), M7(B, C)3 and a few of M23(C, B)6. When the tempering temperature is lower than 500 °C, the shape of carboborides will change from discontinuous sheet to continuous net, and the uniformity in microstructure is improved, and the hardness is not changed during the process. When the tempering temperature is higher than 500 °C, the continuous net of M2(B, C) is recovered. When the tempering temperature is higher than 600 °C, the microstructure of HB-HSS get thickened because of overheating, and the hardness get significantly reduced. With the increase of tempering temperature, the weight loss of the sample is decreased, and the wear resistance of the sample is increased. When tempering temperature exceeds 500 °C, the weight loss of the sample has an obvious increase and its wear resistance decreases. The wear resistance of the sample decreases after the red-hardness treatment. The wear loss is about 8.4 mg when the boron content is 2.0% and the tempering temperature is 500 °C, which is the best of test samples.

Keywords

High-boron high speed steel Tempering temperature Carboboride Red hardness Wear resistance 

Notes

Acknowledgements

The authors would like to thank the financial support for this work from National Natural Science Foundation of China under Grant (51475005), and Beijing Natural Science Foundation (2142009), and “Hundred Talents” of Shaanxi Province (The eighth batch).

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Copyright information

© The Indian Institute of Metals - IIM 2018

Authors and Affiliations

  • Han-guang Fu
    • 1
  • Xiao-ni Liu
    • 1
  • Yong-wei Yang
    • 2
  • Xiao-le Cheng
    • 1
  • Yin-hu Qu
    • 1
  1. 1.School of Mechanical and Electrical EngineeringXi’an Polytechnic UniversityXi’anPeople’s Republic of China
  2. 2.School of Materials Science and EngineeringBeijing University of TechnologyBeijingPeople’s Republic of China

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