The Abrasion Resistance of 27% Chromium Cast Iron Containing Tantalum

概要

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Abrasion resistance of 27% chromium cast iron containing up to 3% of tantalum was investigated. Since tantalum is strong carbide forming element, most part of tantalum added to cast iron is crystallized into as its own carbide TaC, and hardly dissolves into M_7C_3 carbide and the matrix. As the tantalum content in cast iron increases, TaC also increases while the carbon content in the matrix decreases correspondingly. At the same time, retained austenite also increases. That is, the addition of tantalum to cast iron crystallizes it into the primary and/or eutectic TaC harder than M_7C_3 carbide, and lowers the hardness of the matrix. As a consequence, in the plain reciprocating abrasion test, the abrasion resistance increases as the tantalum content increases. It is considered that abrasive wear caused by fixed abrasives is governed by the hard carbide. In the rubber wheel abrasion test, on the other hand, the abrasion resistance peaks when tantalum is around 0.5%, and thereafter it gradually decreases. Abrasive wear caused by free abrasive grains is governed bv the soft matrix.
沼津工業高等専門学校の論文
1994-01-31