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Influence of Tempering Time on the Microstructure and Mechanical Properties of AISI M42 High-Speed Steel

  • Yi-Wa Luo
  • Han-Jie Guo
  • Xiao-Lin Sun
  • Jing Guo
  • Fei Wang
Article

Abstract

AISI M42 high-speed steel is prone to fracture as a result of its brittle martensitic microstructure together with abundant carbides located at the grain boundaries. In this study, a series of property tests including hardness, impact toughness, and wear loss were performed to study the effect of tempering conditions on the mechanical properties of AISI M42 high-speed steel over holding time ranging from 1 to 20 hours. The effects of the tempering time on the characteristics and growth of carbides were also investigated. The results indicated that carbides in the experimental steels were obviously coarsened when the tempering time exceeded 4 hours. The dimension of the carbides increased, while the volume fraction decreased with the increasing tempering time, and the grain sizes were significantly augmented due to the reducing of small carbides. Moreover, the dislocation density decreased with the increasing tempering time, which led to the reducing of the yield stress of high-speed steel. An appropriate holding time (4 hours) resulted in fine-scale secondary carbides and a smaller grain size, which efficiently improved the impact toughness and wear resistance simultaneously. Nevertheless, a prolonged tempering time (> 4 hours) promoted the coarsening and coalescence of carbides, which were detrimental to the impact toughness and wear resistance. Consequently, the formation of fine-scale secondary carbides is the major influential factor to improve both the wear resistance and impact toughness.

Notes

Acknowledgments

The authors acknowledge the financial supports received from the National Natural Science Foundation of China (Grant No. U1560203), and the experimental supports provided by the Central Iron & Steel Research Institute (CISRI). The helpful comments, suggestions, and encouragement from editors and anonymous reviewers are gratefully acknowledged.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2018

Authors and Affiliations

  • Yi-Wa Luo
    • 1
    • 2
  • Han-Jie Guo
    • 1
    • 2
  • Xiao-Lin Sun
    • 3
  • Jing Guo
    • 1
    • 2
  • Fei Wang
    • 3
  1. 1.School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijingP.R. China
  2. 2.Beijing Key Laboratory of Special Melting and Preparation of High-End Metal MaterialsBeijingP.R. China
  3. 3.Tianjin Cisri-Harder Materials & Technology Co. LTD, Central Iron and Steel Research Institute (CISRI)TianjinP.R. China

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