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36 巻, 2 号
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研究論文
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本間 正雄, 目黒 博, 森田 惣五郎, 阿部 善彦1964 年 36 巻 2 号 p. 81-89
発行日: 1964/02/25
公開日: 2012/10/15
ジャーナル フリーThe mechanical properties of the speroidal graphite cast steel were already reported by the authors. This investigation has been made to compare the wear resisting properties of the spheroidal graphite cast steel with those of other cast irons.
The surface hardness of the wear test pieces before and after the wear testing was measured. The results of this investigations can be summarized as follows;
(1) In the dry abrasion between specimens of the same quality, the spheroidal cast steel is remarkably improved its wear resisting properties by oil quenching and tempering treatment.
(2) In the dry abrasion and oil abrasion between specimens of the different qualities, in the pearlitic type this cast steel is superior to the D.C.I.
(3) In the case of dry abrasion, the difference the surface hardness of the wear test pieces before and after the wearing, became larger with an ordering of ferrite, pearlite, quenching and tempering matrix, and bainite. These differences have no relations to graphite shapes or wearing amounts.抄録全体を表示PDF形式でダウンロード (830K) -
—高力黄銅鋳物の製造に関する統計的研究—河野 幸男, 河野 純也1964 年 36 巻 2 号 p. 90-101
発行日: 1964/02/25
公開日: 2012/10/15
ジャーナル フリーBy the statistical analysis, the effects of various factors upon the properties of high strength brass castings have been studied.
Especially on mechanical properties of relatively rapid cooled specimens, the results obtained were as follows;
(1) Tensile strength has negative mutuality relationship to elongation and linear relationship is proved.
(2) Above relationship is little affected by melting conditions.
(3) Copper-equivalent has slso negative mutuality relationship to mechanical properties and linear relationship is proved. These relationship is little affected by melting condition too.
(4) By using these results, it is easy to determine the suitable combination of alloying element for high strength brass castings, and the expectation of the mechanical properties may be possible.抄録全体を表示PDF形式でダウンロード (780K) -
久恒 中陽, 橋本 建次1964 年 36 巻 2 号 p. 102-111
発行日: 1964/02/25
公開日: 2012/10/15
ジャーナル フリーIn order to consider the mechanism of the abrasive wear in the condition of the loose particle, surfaces of carbon steel specimens, 0.71%C, worn by sands were observed microphotographically, and the rate of wear, the roughness of worn surfaces and the thickness of specimens were measured. Each specimen has the initial surface roughness.
Results obtained were as follows:
(1) The process of the abrasive wear is divided into two stages, i. e. primary and steady abrasion.
(2) While the rate of wear in the primary stage is small and is related to the initial surface roughness of a specimen, it is constant in the steady stage, independent of the initial roughness.
(3) The apparent increase of thickness of specimen involves an upheaval of substance caused by the plastic deformation of indentation.
(4) The transition of the primary stage to the steady one takes place when a plastic deformation covers the whole surface of a specimen and when no more apparent increase appears in the thinkness of a specimen giving a constant value of surface roughness. This point of transition is not affected by the initial values of surface roughness.
(5) Metals are worn by an action of mechanical destruction, and it is considered that the resistance to this action of metals are shown in the forms of “Deformability” and “Separatability”, where “Deformability” is termed to what degree a plastic deformation takes place, and “Separatability” to what degree the metal powders separate from a plastically-deformed surface layer.抄録全体を表示PDF形式でダウンロード (1123K) -
鈴木 和郎, 山岡 弘1964 年 36 巻 2 号 p. 112-119
発行日: 1964/02/25
公開日: 2012/10/15
ジャーナル フリーOn the naturally dried mould, authors investigated the relations between the exposed time after moulding and the quantity of washing.
The results were obtained as follows.
(1) The quantity of washing decreases with the exposed time after moulding within 2 hours, but it increases over it.
(2) There may be some relations between the stability of mould surface and the quantity of washing but they are so definite.抄録全体を表示PDF形式でダウンロード (1048K) -
井川 克也1964 年 36 巻 2 号 p. 120-127
発行日: 1964/02/25
公開日: 2012/10/15
ジャーナル フリーIt is well known that the undercooled graphite is obtained in the vacuum melted iron or in the iron containing small amount of titanium. Solidification process of these irons were observed microscopically accompanied by thermal analysis and quenching method.
Deoxidation and desulphurization due to vacuum melting or titanium addition were favourable to the formation of these structure, but contamination by air or sulphur changed the undercooled graphite to flaky one.
The fracture of iron with undercooled graphite is black and that of flaky graphite is grey because of very fine uneveness in the former and roughness in the latter according to the graphite sizes. When the iron has a rosette type structure, it breaks along the flaky graphite preferentially which makes the fracture grey.抄録全体を表示PDF形式でダウンロード (1241K)
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