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35 巻, 10 号
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研究論文
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大平 五郎, 小林 俊雄1963 年 35 巻 10 号 p. 575-581
発行日: 1963/10/25
公開日: 2012/10/22
ジャーナル フリーIn a majority of commercially important metals and alloys the change of volume from liquid to solid at room temperature is attributed to a substantial contraction which brings some problems in a production of practical castings. The value of this volume change is affected by alloying elements, maximum melting temperature, pouring temperature, cooling rate, involved gas and others as reported in the previous paper1). They were measured in simple shaped castings, however, as general castings have rather complicated shapes, their shrinkages were to be measured in castings for different sizes and shapes. The experiments were done with commercially pure aluminium, and the results obtained were as follows.
(1) The shrinkage seemed to lessen slightly by increasing the pouring velocity.
(2) The shrinkage did not decrease by padding of the casting.
(3) The shrinkage decreased by an obstruction of free contraction according to the shapc of the mould.
(4) The shrinkage decreased due to the casting tensile stress.
(5) The length of the casting gave no effect to the shrinkage.
(6) The shrinkage decreased by the feeding of metal as it compensated the contraction.抄録全体を表示PDF形式でダウンロード (646K) -
前川 静弥, 中川 義隆, 鈴木 是明1963 年 35 巻 10 号 p. 581-588
発行日: 1963/10/25
公開日: 2012/10/22
ジャーナル フリーOriginally, manganese has been thought to be a chilling elment, but it shows graphitizing act in the cast iron containing higher sulphur, because it decreases the chilling ability of sulphur. On the other hand, it is important to know the degree of graphitization by sulphur which has also a graphitizing ability in spite of having been thought to be a chillig element.
In order to investigate those properties shown above, we have made experiments on the behaviour of manganese in commercial cast iron and that of sulphur in pure Fe-C alloy solidified very slowly. The result obtained can be summarized as the followings :
(1) Up to 0.40-0.60% manganese tends to promote graphitization, when 0.100-0.300% sulphur is contained, further increase of manganese up to 2.10% shows increasing chill tendency.
(2) Sulphur shows rather the graphitizing tendency up to 0.134% pure Fe-C alloy solidified very slowly, but increasing fusther, it suddenly changes into a chilling element.抄録全体を表示PDF形式でダウンロード (953K) -
沢村 宏, 森田 志郎, 山崎 隆雄1963 年 35 巻 10 号 p. 588-605
発行日: 1963/10/25
公開日: 2012/10/22
ジャーナル フリーThe influences of various conditions of quenching, annealing and preheating before annealing on the graphitization of dilatometric specimens and the influences of quenching and preheating before annealing on the grahitization and ultimate strength of link chain castings were investigatad.
The following results were obtained.
(1) The cracks which may be caused by the quenching from 800∼900°C are not detected in dilatometric specimens and in the link chain castings of 31∼66g in weight.
(2) The higher the quenching temperatures are, the shorter the time required for graphitization is.
(3) By preheating the quenched specimens and the non-quenched specimens up to 48 hours at the temperatures of 350∼550°C before annealing, the time for the first stage graphitization of the non-preheated specimens is shortened to about 1/4∼3/5 of the time for the non-quenched specimens and the time for the second stage graphitization is shortened to about 4/5.
(4) The number of graphite nodules is considerably increased by the quenching, and is exceedingly increased by the preheating before annealing, the number of graphite nodules of the quenched specimens increasing about ten times than that of the non-quenched specimens.
(5) The strength of the ferritic matrix link chain castings is not affected by those heat treatments carried out in this investigation and by the number of graphite nodules resulted from those treatments.
(6) It is possible to decrease the time for graphitization to half by the quenching before annealing without any fall of strength on manufacturing the black heart malleable iron castings.抄録全体を表示PDF形式でダウンロード (1616K) -
奥本 武臣, 近藤 賢治1963 年 35 巻 10 号 p. 606-614
発行日: 1963/10/25
公開日: 2012/10/22
ジャーナル フリーA series of experiments have been done to improve the impact properties of the black heart malleable cast iron by adding small amounts of various special elements to it. In this report, which is the fourth report of the series, the effects of addition of Mg, Ca and Ce were investigated.
The results were summarized as follows; addition of Mg or Ce in amount of 0.4% spheroidizes graphite nodules of this iron, increases the maximum absorbed energy, and retards the second stage graphitization. Insufficient addition of Ca promotes the generation of eutectic graphite, and consequently decreases the impact properties.抄録全体を表示PDF形式でダウンロード (894K)
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