期刊
MATERIALS CHARACTERIZATION
卷 117, 期 -, 页码 1-8出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2016.04.010
关键词
High-speed steel; Spray forming; Mechanical properties; Nb alloying
类别
资金
- National Basic Research Program of China [2011CB606303]
The microstructures and properties of spray formed (SF) high-speed steels (HSSs) with or without niobium (Nb) addition were studied. Particular emphasis was placed on the effect of Nb on the solidification microstructures, decomposition of M2C carbides, thermal stability and mechanical properties. The results show that spray forming can refine the cell size of eutectic carbides due to the rapid cooling effect during atomization. With Nb addition, further refinement of the eutectic carbides and primary austenite grains are obtained. Moreover, the Nb addition can accelerate the decomposition of M2C carbides and increase the thermal stability of high-speed steel, and also can improve the hardness and bending strength with slightly decrease the impact toughness. The high-speed steel made by spray forming and Nb alloying can give a better tool performance compared with powder metallurgy M3:2 and commercial AISI M2 high-speed steels. (C) 2016 Elsevier Inc. All rights reserved.
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