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Volume 13 (1966)
- Issue 6 Pages 263-
- Issue 5 Pages 209-
- Issue 4 Pages 157-
- Issue 3 Pages 107-
- Issue 2 Pages 47-
- Issue 1 Pages 1-
Volume 13, Issue 3
Displaying 1-5 of 5 articles from this issue
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[in Japanese]1966 Volume 13 Issue 3 Pages 107-112
Published: June 25, 1966
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSDownload PDF (450K) -
[in Japanese]1966 Volume 13 Issue 3 Pages 113-121
Published: June 25, 1966
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSDownload PDF (521K) -
Shunjiro Saito, Takeshi Takei1966 Volume 13 Issue 3 Pages 122-127
Published: June 25, 1966
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSBy heating under water vapor, ferrite was formed from coprecipitate made from constituent sulfate solution or wet mixture of component hydroxides, similar to the case of hydrothermal synthesis. Temperature (100°C-300°C) had a marked effect on the velocity of the formation.
In the case of Ni ferrite, pressure of water vapor played an important role on the formation, while in the case of Zn ferrite, it appears that only a small amount of water vapor was enough for the formation.
Even from the dry mixture of component hydroxides, ferrite of normal structure was formed. The formation by this process from the coprecipitate or wet mixture heated in air up to 250°C was also evident.
From these results, some discussions were made on the mechanism of the formation.View full abstractDownload PDF (5240K) -
Repressed and Resintered CompactsYasuaki Morioka, Teruhisa Watanabe, Shoji Wakabayashi1966 Volume 13 Issue 3 Pages 128-135
Published: June 25, 1966
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSEffects of repressing and resintering on the physical and mechanical properties of sintered compacts were studied.
The results obtained were as follows :
(1) Microstructures of sintered compacts have a large effect on the repressing ratio and the increase in density. Ferritic and austenitic structures give large repressing ratios.
(2) On repressing sintered compacts containing Mn 10% and C 1.2% which might show martensitic structure, pre-sintering at a lower temperature and pre-pressing at a lower compacting pressure are recommended, while, for the compacts containing Mn 20% and C 2.0% which might show austenitic structure, pre-sintering at a higher temperature and prepressing at a higher compacting pressure are recommended.
(3) On cyclic sintering and pressing, tensile strength and elongation of sintered compacts of ferritic and austenitic structures are saturated by a single process of repressing and resintering, but those of martensitic structure are not saturated even by repressing and resintering three times. Repressing is less effective for martensitic structures than for ferritic or austenitic structures.
(4) Mechanical properties of sintered manganese steel are much affected by repressing and resintering treatments. Tensile strength of about 35-40kg/mm2, elongation of about 8-13%, and impact energy of about 2-6kg-m/cm2 can be obtained for austenitic manganese steel.View full abstractDownload PDF (2514K) -
Some observations on the alloying processYasuaki Morioka, Teruhisa Watanabe, Shoji Wakabayashi1966 Volume 13 Issue 3 Pages 136-143
Published: June 25, 1966
Released on J-STAGE: May 22, 2009
JOURNAL OPEN ACCESSThe alloying of manganese to iron by powder metallurgical method presents some difficulties. Observations are made in this paper on the alloying of manganese to iron on the alloying process of Fe-Mn-C ternary system during sintering. The results obtained were as follows:
1) Alloying structures of iron-manganese are partially obtained by sintering the compacts from mixtures of iron and 10% manganese powder at 1000-1100°C in hydrogen An addition of carbon to these mixtures improves the alloying between iron and manganese ; by adding more than 0.8% carbon to these mixtures, homogeneous structures are obtained at sintering temperature of 1100°C. The degrees of homogenization of alloying were examined by electron probe micro-analyzer.
2) Following three mechanisms are proposed for the sintering of Fe-Mn-C ternary system :
i) Alloying of manganese directly to iron.
ii) Alloying of manganese to iron-carbon alloy.
iii) Alloying of manganese-carbon alloy or manganese carbide to iron (at high carbon content).
In the case of sintering the compacts containing manganese oxide which is not readily reduced, an application of the alloying process (iii) may be effective.View full abstractDownload PDF (4849K)
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