クロム白鋳鉄の乾式及び湿式アブレシブ摩耗特性に及ぼす化学組成並びに熱処理の影響

概要

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Quenched and tempered Fe-Cr-C and Fe-Cr-V-Mo-Ti-C alloys with 1.0 to 3.7%C, 1.0 to 25%Cr, 0.8 to 10.0%V, 1.0 to 3.0%Mo and 0.2%Ti were tested. Test bars 10φ×75mm in size were rotated at a peripheral speed 231m/min in dry silica sand 20 to 28 mesh in size, 60vol% silica sand +40vol% water and 60vol% silica sand +40vol%CuSO4 aqueous solution. An increase of carbon content in 15%Cr hypoeutectic cast irons improves their wear resistance to 60vol% silica sand +40vol% water, but deteriorates it to more corrosive media such as 60vol% silica sand +40vol%CuSO4 aqueous solution. Coarse primary carbides deteriorate the resistance under any wear conditions. The matrix of the alloy wears preferentially in the corrosive wear media. Remaining primary and eutectic carbides fracture by collosion of abrasive particles. The species and the amount of carbides precipitated during heat treatment have a great influence on the wear resistance, since they affect the content of alloying element in matrix. As VC is harder and contains less Cr than Cr7C3, the addition of V to high Cr cast irons improves the wear resistance.
Japan Foundry Engineering Societyの論文