Effect of chemical composition on microstructure and characteristics of high chromium Ni-hard cast iron

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  • 高クロム系ニハード鋳鉄の組織と材料特性に及ぼす化学成分の影響
  • コウクロムケイ ニハード チュウテツ ノ ソシキ ト ザイリョウ トクセイ ニ オヨボス カガク セイブン ノ エイキョウ

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Abstract

  Effect of chemical composition on the microstructure and characteristics of Ni-hard cast iron has been investigated in order to improve the wear resistance and other material properties by precipitation of hard M7C3 carbide and graphite.<br>   A small amount of graphite and M7C3 type carbide crystallize together in the cast iron of the composition of 2.6mass%C-7.0mass%Cr. The volume fraction of graphite increases with an increase in carbon content. Nickel has a strong effect on the transformation of matrix and the highest hardness is obtained in the cast iron containing 5.0mass%Ni in as-cast state, because of the transformation of austenite to martensite. Tensile strength decreases as carbon content gets over 2.6mass%. Heat crack length is the shortest in the cast iron of 2.6mass%C, and wear loss and amount of sticking decrease with increasing chromium and molybdenum contents. It was found that the optimum chemical composition of high chromium Ni-hard cast iron containing M7C3 type carbide and a small volume fractionofgraphiteis 2.6mass%C-2.5mass%Si-5.0mass%Ni-7.0mass%Cr-2.4mass%Mo, to improve the wear resistance remaining good mechanical properties of conventional Ni-hard cast iron.

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