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Enhanced microstructures and properties of spray-formed M3:2 high-speed steels by niobium addition and thermal-mechanical treatment

Published online by Cambridge University Press:  24 January 2019

Hebin Wang
Affiliation:
School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
Longgang Hou
Affiliation:
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
Ping Ou
Affiliation:
School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
Xiaofeng Wang
Affiliation:
The Faculty of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, China
Yabin Li
Affiliation:
School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
Li Shen
Affiliation:
School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
Hongjin Zhao
Affiliation:
School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
Hua Cui
Affiliation:
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
Jishan Zhang
Affiliation:
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
Corresponding
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Abstract

M3:2 high-speed steel (HSS) billets with or without Nb addition were prepared by spray deposition. The effects of Nb and post-thermal-mechanical processing (decomposition treatment and hot forging), as well as heat treatment, on the microstructure and properties of M3:2 HSS were investigated. The microstructure of the as-deposited M3:2 HSS consisted of equiaxed grains with a mean size of approximately 25 μm and discontinuous plate-like M2C and irregular MC carbides distributed along grain boundaries. 0.5% Nb addition can refine the M2C plates and spheroidize MC carbides. With 2% Nb addition, the refined grains with a mean size of approximately 12 μm and continuous net of M6C and a uniform distribution of NbC carbides were obtained. The decomposition of metastable M2C carbides can be accelerated with 0.5% Nb addition due to the refined size and lower thermodynamic stability of M2C plates. With the increased degree of decomposition of M2C carbide, the M6C and MC carbides became refined and more uniformly distributed after optimal thermal-mechanical processing and heat treatment, which leads to a significant increase in bend strength and toughness.

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Copyright © Materials Research Society 2019 

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Enhanced microstructures and properties of spray-formed M3:2 high-speed steels by niobium addition and thermal-mechanical treatment
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