巻号一覧
後続誌
33 巻, 7 号
選択された号の論文の4件中1～4を表示しています
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研究論文
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坂野 武男, 乗富 一好1961 年 33 巻 7 号 p. 475-496
発行日: 1961/07/25
公開日: 2012/10/29
ジャーナル フリーThe moldig sand properties governing the casting surface defects such as “scab” or “rattail” were studied and their limit values were determined as the measure of sand evaluation on foundry floor. Castings were made in sand molds to be tested and cast surfaces were inspected, while the high temperature properties of the sands were determined in the “thermo-lab”. Natural molding sand was found more reliable than blended silica sand. Semi-blended sand, blended sand with suitable clay minerals, and blended sand with other suitable additions were satisfactory. Hot compression strength and ductility may be chosen as the routine control variables of molding sand. When an addition was made to sand, deformation under stress was another important variable. The larger those three variables, the less were casting surface defects. The significance of high temperature strength of a molding sand was discussed in the light of the experimental results.抄録全体を表示PDF形式でダウンロード (1824K) -
阿部 善彦1961 年 33 巻 7 号 p. 496-502
発行日: 1961/07/25
公開日: 2012/10/29
ジャーナル フリーOn dry abration, the wear resisting properties of various cast irons having diffect graphite shapes have been studied. The uppper speciments are various cast irons of different graphite shapes and the lower specimen is the nodular specimen is the nodular graphite cast steel whivh ws obtained by normalizing. The recults obtained can be summarized as follow :
1. The surface roughness of the upper specimens was influenced by the shapes, dimensions and distributions of graphite when the matrix was pearlite.
2. The ferrite matrix of upper malleable cast iron, nodular graphite cast steel and nodular graphite cast iron specimens are remalarbly less wear resisting, compared with the pearite matrix cast irons and showed very large surface roughness after abrasion.
3. Surface microhardness after avration showed nearly constant value depending upon the tips of the matrces, yet independent of graphite shapes and running distances.
4. On the pearlite matrix of upper specimens, the wearing amounts increased with the chage of graphite shapes from wormy flake graphite, small nodular graphite and eutectic graphite.抄録全体を表示PDF形式でダウンロード (775K) -
山崎 桓友1961 年 33 巻 7 号 p. 503-511
発行日: 1961/07/25
公開日: 2012/10/29
ジャーナル フリーAs a fundamental study of gas sulphurizing process of cast iron, specimens of cast iron were heated in H2S atmosphere at temperture range from 200 to 600°C for 1, 2, 3 and 5 hours, and condition of sulphide formation on and beneath the surface of the cast iron were studied by means of Xray analysis, chemical analysis, metallography, hardness measurement. The wear resisting properties of the sulphurized cast iron were determined by wearing test. The results obtained were as follow;
1) The film formed on the surface of the cast iron consisted always of pyrrhotite (Fe1-xS). Parabollic law, W2=k't, was observed each time, where w meaning the thickness of the sulphide film, t the treating time, and k' a constant.
2) The thickness of the sulphide diffusion layer which was observed beneath film was from 0.05 to 0.15mm. The uppermost part (0.05mm thick.) contained from 0.14 to 2.0%S corresponding to the treating temperature of 200 to 600°C as determined by chemical analysis carried out for the consecutive 0.05 mm layer from the surface.
3) The hardness distribution near the surface of the specimen showed a peack (Fig. 6) at the point where sulphur content coincnded with that of the cast iron, indicating the end of the sulphurized layer. The high hardness value at the peak was assumed due to distortin in the diffusion layer.
4) Diffusion treatment after sulphding caused an increase in the sulpher content in the sulphur diffusion layer. The amount of the sulphur increment was dependent on the diffusion temperature and not on the sulphiding temperature.
5) All sulphide filmes and sulphur diffusion layers stood to wear, except that the sulphide film thicker than 0.04mm seemed to promote wear as specimens with such films worn more tha the untreated specimens.
6) Excessively high sulphur content in the sulphur difffusion layer, in some cases, was damaging to wear resistance.抄録全体を表示PDF形式でダウンロード (894K) -
堀田 一二三1961 年 33 巻 7 号 p. 511-518
発行日: 1961/07/25
公開日: 2012/10/29
ジャーナル フリーDamping capacity, besides tensile strength, is one of the important mechanical properties of cast iron. Damping capacity measurement was made of various cast irons and steels and the reason for the high damping capacity of grey cast iron was discussed in the light of the experimental results. In the first stage of the experiment, the damping capacity of cast iron was found to be almost unchanged with the carborn content up to 3%, but to increase sharply beyond this percentage owing to the mass effect of carbon. In the second stage of the experment, the damping capacity of grey cast iron, meenhanite metal, nodular cast iron, matalleable cast iron, and cast steel was measurd and found to be highly dependent on the graphite shape in the material. The more spherial the graphite in a cast iron, the lower was its damping capacity. Damping capacity was critically dependent on the strain ampltude used in the test. A hystresis phenomenon was observed at high strain amplitudes. The above two effects were most pronounced with cast iron with flaky graphite. The high damping capacity of grey cast iron was attributed to dislocation movement due to stress concentration at pointed edges of graphites. In the third stage of the experiment, stress-strain curves in suport of the hypothesis were obtained from bending tests.抄録全体を表示PDF形式でダウンロード (761K)
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