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影响高速钢韧性的因素_许达37
18 11 Vol. 18, No. 11
2006 11 Journal of Iron and Steel Research November 2006
许 达, 俞 峰, 罗 迪
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: T G1421 4 :A : 1001-0 63( 2006) 11-0001-06
Factors Affecting Toughness of High Speed Steels
XU Da, YU Feng, LU O Di
( Institute for Structural M aterials, Cent ral Iron and Steel Research Instit ute, Beijing 100081, China)
Abstract:T oughness is very important for high speed steel ( HSS) w hich affects strongly the properties and life of
cut ting tools. Factors affecting t oughness of H SS have been studied. T he result showed that the toughness of H SS
is influenced by chemical compositions, steelmaking methods, inclusions, carbides and heat treatment. The tough-
ness increases under the condition of bet ter purity and few er inclusions and decreases w ith increasing C content for
the same grade of steels. W-Mo type steels are better than W type in toughness. Distribut ion, grain size and shape
of carbides are also important factors. The toughness of pow der metallurgy H SS is remarkably better than conven-
tional HSS. Heat t reatment is also another import ant factor, and the toughness will decrease for higher hardening
temperature and low er tempering temperature. Possible w ays of improving the toughness are also discussed.
Key words: high speed steel; toughness
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