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54 巻, 1 号
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研究論文
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大井 利継, 藤岡 稔1982 年 54 巻 1 号 p. 21-26
発行日: 1982/01/25
公開日: 2011/12/29
ジャーナル フリーIt was assumed that only primary graphite would grow in the eutectic stage and no other graphite would be nucleated in this stage, and that at the beginning of the eutectic stage, the graphite nodule would become enveloped by an austenite shell with subsequent growth occurring due to diffusion of carbon through the shell. An expression for the eutectic solidification time tE is obtained as a function of the number of graphite nodules NA, when the degree of super cooling ΔT is small.
tE=KE/Dγ·ΔT·NA
where KE is a constant given by various carbon concentrations and Dγ is the diffusion coefficient of carbon in austenite. The numerical calculation indicates that the change in the composition of the melt has little effect on tE, and that the melt having NA more than 1,000 mm−2 may complete eutectic solidification in a short period of time within 10 sec.抄録全体を表示PDF形式でダウンロード (634K) -
辻川 正人, 池永 明, 岡林 邦夫1982 年 54 巻 1 号 p. 27-32
発行日: 1982/01/25
公開日: 2011/12/29
ジャーナル フリーFerritic spheroidal graphite cast iron is good in terms of ductility but is poor in strength because of the presence of graphite nodules. A harder second phase was introduced around the graphite nodules to improve the mechanical properties of the iron. This treated iron had good sliding wear and fatigue properties. The rolling wear characteristics of the treated iron was investigated in this paper. Even when the volume fraction of second phase is 15%, the wear rate is lower and the rolling life up to generation of abnormal wear is longer compared to pearlitic spheroidal graphite cast iron. A good correlation is found between the rolling life and the endurance limit of alternating bending fatigue.抄録全体を表示PDF形式でダウンロード (716K) -
田上 道弘, 佐藤 幹夫, 吉田 幸男, 橋浦 廣吉1982 年 54 巻 1 号 p. 33-37
発行日: 1982/01/25
公開日: 2011/12/29
ジャーナル フリーEffects of Ni, Mo, Co, Si, Cr and C additions on fracture toughness of as-cast Fe-18%Cr-3.3%C alloys were studied by double torsion bending test. The fracture toughness is significantly affected by carbon content. An increase in carbon content from 2.97% to 4.11% results in 30% decrease in fracture toughness. Additions of 1∼4.9%Ni and 0.76∼3.26%Mo increase the fracture toughness 10∼25% and 5∼15% respectively. 0.5∼1.6% additions of cobalt, however, lower the fracture toughness from 85.0 to 73.8 kg/mm3/2. Chromium iron of 24.8%Cr has 30% higher fracture toughness than that of 14.85%Cr with the same carbon level.抄録全体を表示PDF形式でダウンロード (707K) -
柳沢 平, 呂 傳盛1982 年 54 巻 1 号 p. 38-43
発行日: 1982/01/25
公開日: 2011/12/29
ジャーナル フリーThe thermal fatigue crack in the ferritic spheroidal graphite and compacted-vermicular graphite cast iron pass through the graphite nodules or particles. When the crack grows into the high temperature region where the yield strength lowers, the crack remarkably branches off. In these cast irons, the condition for the maximum crack propagation rate does not coincide with that for the maximum stress intensity factor at the crack tip resulting from thermal stress, but slips off to the higher temperature side. The mechanical properties of the materials have greater influence on the crack propagation rate than the stress intensity factor in this temperature region.抄録全体を表示PDF形式でダウンロード (607K)
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