耐酸高珪素鋳鉄に関する研究 (I) : 機械的性質, 耐蝕性及び凝固収縮率に及ぼす Si 及び C 含有量の影響

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The effects of Si and C contents on the mechnical properties, corrosion resistance, shrinkage and microstructure of acid-resistant high-silicon irons were investigated. The results are summarized as follows : (1) The corrosion rapidly decreases with increasing Si and the maximum resistance reaches about 15.5 pct of Si against sulphuric acid (sp. gr. 1.10) and about 14 pct of Si against hydrochloric acid (sp. gr. 1.09). (2) In the practical alloys containing 14∿16 pct of Si, the transverse strength is higher in the alloys with lower Si and higher C contents (0.6∿0.8 pct), with medium Si and medium C (0.5∿0.7 pct) and with higher Si and lower C (0.3∿0.5 pct). (3) The deflection is very small and the ductility seems to increase slightly as the Si content becomes lower or the C content becomes higher. (4) The micro-Vickers hardness of the α-phase increases with increased Si content up to about 15 pct, above which there is very little change. (5) The shrinkage shows maximum value at the alloys containing 15.5∿16.0 pct Si and the effect of C on the shrinkage is small. (6) The shape and type of graphite greatly infiuence the Rockwell hardness and transverse strength. The η-phase (Fe_5Si_3) found in high Si alloys decreases the strength.
社団法人日本鉄鋼協会の論文
1955-12-01