Influence of P and B on Hard Phase Characteristics in Flake Graphite Cast Iron

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  • 片状黒鉛鋳鉄の硬質相形成に及ぼすりん, ほう素の影響
  • ヘンジョウ コクエン チュウテツ ノ コウシツソウ ケイセイ ニ オヨボス リン ホウソ ノ エイキョウ

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Abstract

  Cast irons with hard phases such as steadite and cementite have been widely used for cylinder-liners of marine engines. The hard phases are formed due to the addition of P or B, and their morphology strongly influences, sliding properties (scuffing resistance, wear resistance, etc.), machinability and mechanical properties. In order to understand metallurgical features, the effects of small amounts of P and B on the formation of the hard phases were discussed using cast iron with 3.3%massC, 1.3%massSi, 0.8%massMn, 0.05%massS, and 1.4%massCu. Microstructural observation, SEM/EDS or SEM/WDS quantitative analysis, and volume fraction measurement of hard phases were performed. From the experimental results it was found that P leads to the crystallization of steadite, while B leads to that of cementite. This work also discussed the morphology of each hard phase and the mutual dependence of P and B when cast iron contained both elements. As for the volume of the hard phases, the establishment of a quantification method is also desirable from an industrial point of view. The relationship between the volume fraction of the hard phases and P and B contents was investigated, and it was clarified that the volume fraction of steadite and cementite increases with an increase in the P and B contents respectively. The feasibility to predict the volume fraction of these phases as a function of the P and B contents was also evaluated using Shceil's equation.

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