球状黒鉛鋳鉄の連続冷却変態挙動及び熱処理特性に及ぼす炭素の影響 [in Japanese] Effects of Carbon on Continuous Cooling Transformation Behavior and Heat Treatment Characteristics for Spheroidal Graphite Cast Iron [in Japanese]
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This study was conducted to clarify the effects of C content on heat treatment characteristics by using three kinds of spheroidal graphite cast irons containing 2.6mass%C to 3.6mass%C. The austenitizing condition was 1223K-900s. The ferrite, pearlite, bainite and martensite transformation regions existed in the CCT diagrams of all cast irons. Little influence of C content was seen for each transformation region in the CCT diagram, but in the case of the 3.5%C cast iron, the ferrite transformation region shifted slightly to higher temperature and shorter cooling time with the increase in C content. Pearlite started to precipitate at higher temperatures than ferrite in the cooling time range between 20 and 600s. The quenching hardness dropped slightly with an increase in C content, but the hardenability of spheroidal graphite cast iron did not influence C content in base materials. <br> The effects of C content on quenching hardness and hardenability were slight. The transformation behavior and hardenability of spheroidal graphite cast irons containing 2.6mass%C to 3.6mass%C differ from those of steels, and this is considered due to graphite in the cast iron.
- THE JOURNAL OF THE JAPAN FOUNDRYMEN'S SOCIETY
THE JOURNAL OF THE JAPAN FOUNDRYMEN'S SOCIETY 78(9), 464-469, 2006-09-25
Japan Foundry Engineering Society