巻号一覧
49 巻, 4 号
選択された号の論文の6件中1～6を表示しています
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渡辺 敏幸, 石田 清仁1978 年 49 巻 4 号 p. 225-234
発行日: 1978/11/15
公開日: 2009/05/25
ジャーナル フリーTo develope a precipitation hardening ferritic stainless steel, the effect of Mo, Si and Ni on the aging behavior of Fe-14% Cr base alloys has been studied. The results obtained are as follows:
(1) The additions of Si and Ni to the Fe-14% Cr-(4∼6)% Mo alloys have a marked effect on the aging characteristics despite that the hardness increments of the base alloys are low.
(2) The hardness after solution treatment is about 20∼30 of Rockwell C scale, while the aging hardness is reached to 40∼55. The hardness increment is larger than the commercial PH stainless steels.
(3) Aging temperature of peak hardness is about 550∼600°C and is higher than that of martensitic PH stainless steels.
(4) The higher the cooling rate of the solution heat treatment, the more rapid the attainment of maximum hardness and the higher the hardness value.
(5) The X-ray data indicate that the compound precipitated is R phase which is previously observed in Fe-Mo system. The chemical analysis of electrolytic exracted residue shows that the R phase contains a large amount of Mo.抄録全体を表示PDF形式でダウンロード (4678K) -
上原 紀興, 松永 健吉1978 年 49 巻 4 号 p. 235-241
発行日: 1978/11/15
公開日: 2009/05/25
ジャーナル フリーFrom the studies of heat-treatment for a Ni-base superalloy “Udimet 520”, it was found that control-cooling from solution temperature was effective, comparing with conventional air cooling, to improve the mechanical properties. That is, as dcreasing the cooling rate from solution temperature, toughness and creep rupture elongation were increased and creep rupture strength was decreased. Therefore, it was suggested that the best combination of toughness, creep rupture elongation and creep rupture strength would be obtained by controlling the cooling rate from solution temperature and controlling the content of Al and Ti. The reasons for the improvement of toughness and creep rupture elongation by control-cooling was supposed to the changes in grain boundary structure. That is, after control-cooling, it was observed by TEM that grain boundary was irregular and gamma prime precipitated on grain boundaries.抄録全体を表示PDF形式でダウンロード (7908K) -
小畑 英一, 伊藤 一夫, 飯久保 知人1978 年 49 巻 4 号 p. 242-250
発行日: 1978/11/15
公開日: 2009/05/25
ジャーナル フリーPrecipitation of σ phase was investigated about two type micro-duplex stainless steels; DSD1H, WS312.
Special attention should be paid to change of microstructure during aging.
The results obtained are as follows.
(1) Precipitation of σ phase is very rapid in micro-duplex stainless steel, especially in WS312.
(2) Hardness increases while impact value decreases as σ phase precipitates in micro-duplex stainless steel.
(3) Precipitation of σ phase in grain-boundary-reaction (GBR) type in micro-duplex stainless steel. Ferrite phase changes to σ phase and austenite phase to aging.
(4) It was observed that ferrite-austenite interface moved prior to σ phase precipitation in DSD1H.
No movement of interface was observed in WS312.抄録全体を表示PDF形式でダウンロード (9250K) -
宮崎 亨, 小坂井 孝生1978 年 49 巻 4 号 p. 251-261
発行日: 1978/11/15
公開日: 2009/05/25
ジャーナル フリーThe phase-decompositions of super-saturated solid solutions are drived through two decomposition mechanisms, “Nucleation-Growth” and “Spinodal Decomposition”. This review is concerned with thermodynamics and kinetics of the latter mechanism and with morphologies of microstructures produced by the spinodal decomposition. When the supersaturated solid solutions are held inside the spinodal region of phase-diagram, specified sinusoidal composition waves, which are theoretically given, increase so rapidly in soluteconcentration that the natures of waves become to dominate over the microstructural morphologies. If the lattice strain between the conjugating mixtures and elastic anisotropy of the crystals are large, the specified directional decomposition, mainly along <100> cube directions, becomes larger than that of the other directions and then the modulated structure is formed, while if either the lattice strain or the elastic anisotropy is small, the microstructure results in “a mottled structure”. The review is also drived on the coarsening behaviours of precipitates in the alloys spinodally decomposed.抄録全体を表示PDF形式でダウンロード (8226K) -
藤原 達雄, 小畑 英一, 斉藤 誠1978 年 49 巻 4 号 p. 262-269
発行日: 1978/11/15
公開日: 2009/05/25
ジャーナル フリーAn inexpensive precipitation hardened heat resistant alloy HN11 developed for applications to heat resistant fasteners and springs are introduced. It has the following characteristics.
(1) High 0.2% proof stress and relaxation properties are maintained up to 650°C.
(2) Elevated temperature fatigue strengths up to 650°C are equivalent to room temperature strength.
(3) It has good cold-workability equivalent to SUS305.
(4) Its heat treatment is simple and high strength is obtained when combined with cold-working.
Its major applications are heat resistant fasteners, springs, and hot dies.抄録全体を表示PDF形式でダウンロード (5275K) -
小畑 英一, 伊藤 一夫, 加藤 毅1978 年 49 巻 4 号 p. 270-280
発行日: 1978/11/15
公開日: 2009/05/25
ジャーナル フリーPrecipitation hardening hot work die steel containe low percent of carbon (about 0.2%) and strong secondary hardening element such as molybdenum. In case of usual hot work die steels, a die is machined from a steel in annealed condition and heat-treatment is carried out after machining. So, distortion due to heat-treatment is unavoidable. On the other hand, there is no distortion problem with precipitation hardening hot work die steel, because it is possible to be machined after heat-treatment (quenched and pre-tempered at about 400°C). Moreover, die life is prolonged because die surface shows secondary hardening during hot working. Precipitation hardening hot work die steel has marked advantages such as mentioned above, so it is expected to use for press forging dies. In this paper, manufacture and properties of 0.2C-3Ni-3Mo precipitation hardening hot work die steel are explained.抄録全体を表示PDF形式でダウンロード (7489K)
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