Title

MULTI-COMPONENT WHITE CAST IRON FOR HOT WORKING ROLL

Authorship

MATSUBARA, YASUHIRO,; SASAGURI, NOBUYA,; WU, HONGQUANG,; ALBERTIN, EDUARDO; BOCCALINI, MARIO

MATSUBARA, YASUHIRO,

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SASAGURI, NOBUYA,

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WU, HONGQUANG,

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ALBERTIN, EDUARDO

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BOCCALINI, MARIO

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DOI

10.5151/2594-5327-49v5-01-10

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Abstract

Multicomponent white cast iron as a new wear resistance material, which is under development for rolls of steel rolling mill, is introduced in this paper. The solidification structure, i.e., the type and the three-dimensional morphology of carbide precipitated during solidification, and the influence of alloying element and solidification rate on them were investigated in detail. The cast iron contains approximately 5% of each element: chromium, molybdenum, tungsten, vanadium and cobalt. The carbon content of the iron ranges from 1.70 to 2.90% depending on its application. It is found that MC, YC or @C and %C₃ carbides precipitate while freezing, and the morphology and the volume of the carbides are varied widely by chemical compositions of the iron. Particularly, MC carbide is classified by morphology into three kinds; net-like, nodular or spheroidal and rod-like or needle-like structures. On the other hand, the morphology of YC carbide is of two kinds; plate-like and lenticular. That of %C₃ carbide is rod-like. As an example, wear test results of this material applied for roll of hot strip finishing mill are demonstrated.

Keywords

ferro fundido branco, resistência ao desgaste, carbonetos, solidificação, elementos de liga