巻号一覧
前身誌
69 巻, 7 号
選択された号の論文の24件中1～24を表示しています
- |<
- <
- 1
- >
- >|
-
新美 格1983 年 69 巻 7 号 p. 721-727
発行日: 1983/05/01
公開日: 2009/06/30
ジャーナル オープンアクセスPDF形式でダウンロード (1242K) -
駒井 謙治郎1983 年 69 巻 7 号 p. 728-736
発行日: 1983/05/01
公開日: 2009/06/30
ジャーナル オープンアクセスPDF形式でダウンロード (1623K) -
山本 育郎1983 年 69 巻 7 号 p. 737-738
発行日: 1983/05/01
公開日: 2009/06/30
ジャーナル オープンアクセスPDF形式でダウンロード (462K) -
浅田 実, 大森 康男1983 年 69 巻 7 号 p. 739-745
発行日: 1983/05/01
公開日: 2009/06/30
ジャーナル オープンアクセスMechanical properties of iron ores are measured under the compression test.
The results obtained are as follows:
(1) Young's modulus of iron ores is proportional to the apparent specific gravity respectively. And the Young's modulus of the hematite shows considerably higher than that of the magnetite.
(2) Young's modulus of iron ores can be expressed as a straight line, independent of the ore brand, when it is indicated against the porosity.
(3) Poisson ratio of hematite and magnetite is 0.24 and 0.33 respectively.
(4) There is a remarkable difference of Young's modulus between pellet and iron ore.抄録全体を表示PDF形式でダウンロード (2957K) -
西岡 信一, 佐野 信雄1983 年 69 巻 7 号 p. 746-752
発行日: 1983/05/01
公開日: 2009/06/30
ジャーナル オープンアクセスThe possibility of direct steelmaking utilizing smelting reduction of iron ore by coke was investigated by using argon plasma jet as a heat source. Coke powder was included in an iron ore pellet for the promotion of reduction and the weight of pellets charged ranged from 1.2 to 3.8 kg. The typical composition of metals obtained with the slag containing 23%Fe and 0.0020.005%P is 0.5%C, 0.2%S and 0.018%P, the process being accompanied by the significant gaseous desulfurization and dephosphorization. This may be attributed to the carrying effect of gaseous species of S and P by CO which vigorously evolves on the very rapid reduction of iron ore at high temperatures due to plasma heating, and to good contact between ore and coke in pellets. The addition of flux such as CaO and CaF2 improved the final composition of metals to yield 0.15%C, 0.003%P and 0.05%S.抄録全体を表示PDF形式でダウンロード (1041K) -
小沢 泰久, 鈴木 克紀, 森 一美1983 年 69 巻 7 号 p. 753-759
発行日: 1983/05/01
公開日: 2009/06/30
ジャーナル オープンアクセスThe present study has been made to obtain fundamental knowledge on the mechanism of contact of particles with liquid metal during powder injection. A spherical body was dropped onto a stagnant mercury bath and the behavior of the penetration of the sphere was recorded by a high speed cinecamera. The spheres tested were of glass, sapphire, stainless steel, and hastelloy B (diameter =0.159 0.953 cm).
The sphere impinging the liquid surface makes a cavity. Then the sphere jumps up from the surface of the cavity when the entry velocity is lower than a critical one. At higher entry velocities, however, the impinging sphere dips into the liquid while the cavity disappears; shortly afterward the sphere rises back to the surface with a mercury film. Based on the measurement of the jumping height of the sphere and the time during which the sphere is immersed in the liquid, the critical entry velocity for the particle penetration into the liquid has been determined.
Taking into account the inertia of the liquid surrounding the sphere and the cavity formation, one has given a new model describing the penetrating behavior of the sphere into the liquid. The experimental results are well explained by the theoretical calculation. It is shown that the cavity formation plays an important role in the mechanism of contact of particles with liquid metal.抄録全体を表示PDF形式でダウンロード (4300K) -
前田 正史, 塩見 純雄, 佐野 信雄1983 年 69 巻 7 号 p. 760-766
発行日: 1983/05/01
公開日: 2009/06/30
ジャーナル オープンアクセスThe dephosphorization of Fe-Mn-5%C-0.1%P melts containing 4 to 27% of manganese was studied by using K2CO3-KF, K2CrO4-KF, and K2CO3-KCl fluxes. As a result, 75% of phosphorus was removed from Fe-16%Mn-5%C-0.1%P melt by 70%K2CO3-30%KF at 1250°C with 2% of manganese loss, for example. The 50%K2CrO4-50%KF flux was as effective for the dephosphorization below 20% of manganese as 70%K2CO3-30%KF but the manganese loss was less than in the latter case.
The phosphate capacity defined as (%PO43-)·Pp2-1/2·PO2-5/4 was estimated for various fluxes and that of the K2CO3-KF flux, 1026 was found to be far greater than those of conventional slags.抄録全体を表示PDF形式でダウンロード (891K) -
長 隆郎, 岩田 勝吉, 井上 道雄1983 年 69 巻 7 号 p. 767-774
発行日: 1983/05/01
公開日: 2009/06/30
ジャーナル オープンアクセスThe amounts of nitrogen and oxygen absorbed during tapping from the converter are estimated. The mass transfer coefficient in the liquid phase during tapping becomes large as 0.1.0.2 cm/s, due to the violent agitation of molten steel in the ladle. Absorption efficiencies of nitrogen by air entrainment, ηE, and through the surface of tapping stream, ηst, decrease with increasing oxygen content in the molten steel. Although the amounts of nitrogen and oxygen absorbed during tapping are practically independent of the tilting rate, the heat size, and the profile of the converter, they decrease with decreasing tapping height and somewhat increase with increasing slag depth in the converter. It is also estimated that those amounts increase with decreasing tapping hole diameter and with increasing its length.
A nomograph for the estimations of oxygen and nitrogen absorptions by the gas entrainment and also through the surface of tapping stream was proposed. The estimated amounts of nitrogen absorbed during tapping agreed well with the values reported in the literature.抄録全体を表示PDF形式でダウンロード (1417K) -
山田 桂三, 東 洋幸, 檜山 猛, 西前 年1983 年 69 巻 7 号 p. 775-781
発行日: 1983/05/01
公開日: 2009/06/30
ジャーナル オープンアクセスThe LD-AOD process was previously reported. This report is concerned with direct stainless steelmaking by AOD process with top blowing from molten Fe-Ni and Fe-Cr materials, which has been investigated in order to get increased saving of materials and energy. The results obtained are as follows:
1) The steelmaking process can be simplified because of unnecessary pretreatment in the E.F. or the L.D. converter.
2) AOD with top blowing is effective to refine high carbon (C = 3.54.5%) and high silicon (Si = 1.52.5%) molten alloys. It results in increase of the decarburization and desiliconization rate, and consequently reduces operation time and Fe-Si consumption.
3) Although 84% of the inert gas consumed is nitrogen, the nitrogen content in the products can be controlled below 650 ppm.抄録全体を表示PDF形式でダウンロード (1024K) -
木原 諄二, 銅屋 公一, 中村 一元, 吉原 達夫, 佐野 義一1983 年 69 巻 7 号 p. 782-789
発行日: 1983/05/01
公開日: 2009/06/30
ジャーナル オープンアクセスA small laboratory scale hot strip test mill was developed for the purpose of studying the roll wear in a hot strip mill. Using the test mill, various phenomena observed in production mills were reproduced. They were wear patterns, cracks, cat-ear wear, black film, effects of oil lubrication, and so on. The phenomena in the test mill were compared with those in production mills and utility of the test mill was discussed.
Using the test mill, anti-wear properties of mineral oils and fatty acids were estimated. It was found that some mineral oils increased the roll wear. It was also found that stearic acid in a mineral oil had an excellent anti-wear property. The relation between anti-wear properties and lubricity was discussed. The different effects of fatty acids on the roll wear were considered to come from the enlargement of difference of their lubricity due to very long rolling length.抄録全体を表示PDF形式でダウンロード (7105K) -
住友 芳夫, 古林 英一, 中村 森彦1983 年 69 巻 7 号 p. 790-797
発行日: 1983/05/01
公開日: 2009/06/30
ジャーナル オープンアクセスSustained load tensile testing has been made while under cathodic charging with hydrogen using notched sheet specimens of an 18% Ni maraging steel. Two kinds of specimens as to the way of processing prior to aging have been prepared; R-specimens which were cold rolled after solution treatment, and S-specimens undeformed after solution treatment. Aged S-specimens have shown characteristic delayed failure, accompanied with subcritical intergranular fracture surfaces. No. fracture has been observed below a stress called the lower critical stress, at which the local concentration stress at notch roots is found to be identical to the yield stress of the specimens.
Cold rolling prior to aging has resulted in great suppression of hydrogen induced intergranular cracking, and the fracture lives are increased even by 70 times with rolling reductions up to 30%. The effect, however, is being saturated in the heavier reduction of 80%, where the delaminations along rolling planes have been observed. From fractographic evidence, apparent Kc has been found to decrease greatly in 5-specimens during the testing, but not remarkably in R-specimens.
No delayed failure has been observed in 80%-rolled R-specimens when the age-hardening is confined within the strength level of conventionally treated (i.e. non-deformed and peak-aged) S-specimens.抄録全体を表示PDF形式でダウンロード (4617K) -
広瀬 祐輔, 住谷 次郎, 戸川 博1983 年 69 巻 7 号 p. 798-805
発行日: 1983/05/01
公開日: 2009/06/30
ジャーナル オープンアクセスRelations between Al-enrichment to the surface layer of Al-killed steel sheets during short-time heating in an H2-N2 atmosphere and its wetting characteristics with a molten zinc were studied in connection with the surface structures of the steel sheets.
1) The wettability of Al-killed steel sheets with the molten zinc after the reduction-heating for a short time varies depending on the Al concentration of the surface layer. It is degraded in accordance with the thickness of aluminosilicates which is formed on the surface layer.
2) While the degree of Al-enrichment is notably increased by heating at temperatures above 800°C, the wettability does not decrease. In this case, the film consists of a defect spinel type structure of <111> oriented γ-Al2O3 which is partially substituted with Fe at the vacancy site.
3) The degree of Al-enrichment to the surface layer varies depending on the quantity and the state of Al in the steel sheets. When Al is stabilized as AlN, the Al-enrichment by reduction-heating is significantly depressed.
4) The wettability does not decrease after the partial oxidizing treatment which forms visible oxide films on the steel surface, followed by the reduction-heating.抄録全体を表示PDF形式でダウンロード (6063K) -
村上 雅人, 柴田 浩司, 長井 寿, 藤田 利夫1983 年 69 巻 7 号 p. 806-814
発行日: 1983/05/01
公開日: 2009/06/30
ジャーナル オープンアクセスPine cone like fracture surfaces ("pine cone") were observed in Charpy and compact tension specimens of cryogenic Ni steels containing retained austenite when temper embrittled and broken in a brittle manner. 5.5Ni steels, especially those bearing no molybdenum, were severely embrittled on slow cooling from the final tempering, and their fracture surfaces were mainly composed of "pine cone". Microscopic observations and various mechanical tests were performed to elucidate the characteristics of this fracture surface.
It was found that "pine cone" is a kind of intergranular fracture surfaces and produced by fracture along P segregated α'/γ interfaces which formed at prior austenitic grain boundaries and its roughness is not caused by precipitates but the reverted austenites at grain boundaries. Intercritical heat treatment promoted austenite formation at grain boundaries and enhanced the roughness of "pine cone" and suppressed "pine cone" fracture. It was also found that the reverted austenite was not stably present on "pine cone" fracture surface through Mössbauer spectroscopy nevertheless reduced susceptibility to temper embrittlement.抄録全体を表示PDF形式でダウンロード (12399K) -
添野 浩, 土屋 正利, 田口 和夫, 黒田 哲郎1983 年 69 巻 7 号 p. 815-820
発行日: 1983/05/01
公開日: 2010/02/16
ジャーナル オープンアクセス(1)溶体化温度の高いマルエージ鋼のオーステナイト粒を冷間加工後に溶体化する方法で十分に微細化するのは困難である.
(2)17.5Ni-125Co-5.4Mo-2Ti鋼(γ粒度ASTM No.10.5～11)および17.5Ni-12.5Co-6.2Mo-1.7Ti鋼(γ粒度ASTM No.8.5～8)の500°～540℃時効における最高時効強度として,それぞれ280kgf/mm2および270kgf/mm2に近い値が得られ,延性も良好である.さらに65%冷間圧延後に同様な温度範囲で時効し,17.5Ni-12.5Co-5.4Mo-2Ti鋼の最高時効強度として圧延方向約300kgf/mm2,直角方向約315kgf/mm2,また17.5Ni-12.5Co-6.2Mo-1.7Ti鋼の最高時効強度として圧延方向約293kgf/mm2,直角方向約307kgf/mm2を得た.
(3)17.5Ni-12.5Co-5.4Mo-2Ti系および17.5Ni-12.5Co-6.2Mo-1.7Ti系マルエージ鋼は,冷間加工後に溶体化してγ粒度をASTM No.11～8程度に微細化し得る限界に近い組成に相当する.抄録全体を表示PDF形式でダウンロード (2640K) -
山崎 桓友, 財前 孝, 浅見 昭三郎, 曽村 倫久1983 年 69 巻 7 号 p. 821-828
発行日: 1983/05/01
公開日: 2009/06/30
ジャーナル オープンアクセスIn the previous paper, 1) it has been reported that the crystal structures of oxide films formed on the surface of bright-annealed type 430 ferritic stainless steel depend on the bright-annealing conditions and chemical composition, especially Mn and Si contents of the steel, and influence the corrosion resistance of the steel to dilute sulphuric acid.
This paper deals with the influence of oxide films formed on the surface of type 434 steel upon the corrosion resistance to dilute sulphuric acid, when bright-annealed under various treating conditions.
The results obtained are as follows;
Despite that SUS 434 contains Mo as an important element to improve the corrosion resistance, oxidation behaviour of the steel (Si : 0.45%, Mn : 0.52%, Mo : 0.99%) in H2-H2O atmospheres with dew points of -10° to -40°C at temperatures of 800° and 900°C is almost same as that of type 430 containing same contents of Mn and Si. The crystal structures of oxide films formed on the surface of the steel, when treated in the atmospheres with dew points of -10° to -30°C at 900°C, are mainly MnCr2O4 and SiO2. With increasing dew point in this range, the formation of inner oxide layer is promoted and SiO2 precipitates in the substratum near the interface between oxide film and substratum. On the contrary, with decreasing dew point, SiO2 precipitates densely and forms an external oxide film with MnCr2O4.
The corrosion resistance behaviour of bright-annealed SUS 434 can be explained by the variation of the microstructure and thickness of the oxide films formed under the varied treating conditions.抄録全体を表示PDF形式でダウンロード (3090K) -
滝沢 貴久男, 志水 康彦, 樋口 義弘, 田村 今男1983 年 69 巻 7 号 p. 829-836
発行日: 1983/05/01
公開日: 2010/02/15
ジャーナル オープンアクセスThe effect of γ grain size on stress corrosion cracking (SCC) behavior of a 25Cr-6Ni-2Mo duplex stainless steel was studied by means of constant load method in boiling 42%MgCl2 solution. The main results obtained are as follows:
(1) On heating at 950 or 1050°C, the growth of γ grain was nearly proportional to one-half power of holding time and SCC susceptibility increased with the grain growth of γ. By preparatory heating at 1150 or 1300°C before the final heat treatment of 0.5 h at 950°C, γ grain was coarsened remarkably and SCC susceptibility was increased up to that of SUS304.
(2) On isothermal aging at 475°C for long time, SCC susceptibility of the microduplex structure decreased remarkably as compared with that of the coarser structure. In the coarser structure, deformation twin formed easily in α by applied stress after aging, and it should be directly connected with the initiation of cracks. In the microduplex structure, however, did not form.
(3) In both of the microduplex and coarser structure, the cracks propagated preferentially in α and the interface of α and γ similarly to the case of non-aging, and the crack restraining effect was observed in γ.抄録全体を表示PDF形式でダウンロード (10063K) -
増尾 誠, 曽根 雄二, 小野 寛1983 年 69 巻 7 号 p. 837-844
発行日: 1983/05/01
公開日: 2009/06/30
ジャーナル オープンアクセス低濃度食塩水中におけるオーステナイト・ステンレス鋼の耐応力腐食割れ性に及ぼす合金元素の影響を,80℃の1000PPm Cl-および21000ppm Cl-水溶液中にスポット溶接試験片を8カ月間の気液界面浸漬試験を行つて調べた.得られた結果は以下のとおりである.
(1)オーステナイト・ステンレス鋼の応力腐食割れの発生に対しては,2%のSiとMoを単独あるいは複合添加しても効果がみられなかつた.しかし,2%のCuの添加は単独あるいはCuとSi, Moとの複合添加のいずれにおいても有効であることがわかつた.
(2)応力腐食割れの防止に対するNiの効果はあまり認められなかつた.CとNの低減およびPとSの低減はあまり顕著な影響を示さなかつた.またTi, Nb, Zr, V, Wの微量添加も割れ感受性に対してほとんど影響しなかつた.
(3) 浸漬試験による腐食度から,Cuの添加はMoのような腐食(すきま腐食)の進行そのものを抑制することによる割れ抑制効果と異なつて,すきま腐食を生じてもすきま内部からの割れの発生を防ぐ作用があるものと推察された.抄録全体を表示PDF形式でダウンロード (5293K) -
鳥阪 泰憲, 土取 功, 宮川 松男1983 年 69 巻 7 号 p. 845-852
発行日: 1983/05/01
公開日: 2009/06/30
ジャーナル オープンアクセスThe effect of the fine recrystallized grains by annealing on the damping capacity was investigated by using of powder alloys. After sintering ferritic Fe-16.5%Cr powder and austenitic Fe-25%Cr-20%Ni powder were rolled 40%, 60% and 80% and annealed at various temperature heated for 1 h, the damping capacity, the hardness and the tensile properties for these specimens were measured at room temperature. Only sintering austenitic Fe-25%Cr-20%Ni powder rolled 80% and annealed at 820°C indicated good results that the internal friction Q-1 was 1.0 × 10-2, the ultimate tensile strength σB was as high as high tensile steel, 69 kgf/mm2 and the total elongation δ was 18.7% in spite of powder alloy.抄録全体を表示PDF形式でダウンロード (12379K) -
坪田 一一1983 年 69 巻 7 号 p. 853-860
発行日: 1983/05/01
公開日: 2009/06/30
ジャーナル オープンアクセスA study has been made on the characteristics of the platelike carbides formed under the rolling track during the thrust type rolling fatigue tests. By EPME analysis, chemical shift measurements by EPMA of C-K bands, and electron microscope observations, the platelike carbides are found to be cementites and ε carbides formed independently at a ratio of 1 to 1.
EPMA analysis shows that concentrations of Mn and Cr in the platelike carbides are the same as in the matrix. The platelike carbides, cementites or εs carbides, are etched dark by alkaline sodium picrate in similar tone. When heated to 800°C, the platelike carbides dissolve into the matrix as the spheroidized cementites do.抄録全体を表示PDF形式でダウンロード (8695K) -
鈴木 章, 岡村 正義, 広瀬 和夫, 田中 重明1983 年 69 巻 7 号 p. 861-867
発行日: 1983/05/01
公開日: 2009/06/30
ジャーナル オープンアクセスIn order to improve the quality of the central axial part of CrMoV steel rotors, the investigations were performed on the rotors made of conventional Si-killed steel, extra low sulfur Si-killed steel, vacuum carbon deoxidized (VCD) steel, and electroslag remelted (ESR) steel.
From the comparison of sulfur prints of the end cross sections of the rotors, an inprovement in the segregation pattern was observed in the rotor made by applying VCD and the reduction of segregates was found in the rotor made of extra low sulfur steel.
The rotor manufactured from ESR ingot showed the best result; in addition to finding no spot in sulfur print, there was no indication in the magnetic particle test of the axial bore in the magnetizing condition of 700 ampers per inch of the bore diameter. Some indications were detected, however, in the condition of 300 amperes per inch on the rotor made of Si-killed steel.
These results have been discussed in the light of the current concepts on segregation.抄録全体を表示PDF形式でダウンロード (13628K) -
金尾 正雄, 佐々木 悦男, 太田 昭彦, 小菅 通雄1983 年 69 巻 7 号 p. 868-873
発行日: 1983/05/01
公開日: 2010/02/16
ジャーナル オープンアクセス工業的に多用されている8種のフェライトパーライト鋼及び焼もどしマルテンサイト鋼厚板の疲れき裂伝ぱ特性をうず電流探傷法を利用したき裂自動追尾装置を備えたK値制御疲れ試験機により,応力比が-1から0.8の範囲の数種のレベルで求めるとともに応力及び材料因子の効果について検討して次の結論を得た.
1)いずれの応力比の場合においても,ΔKthが存在し,応力比の増加に伴いΔKthが減ずる傾向を示し,
ΔKth,R= (1- R)γ ΔKth,o
で表示される.γは0.6から0.8の範囲にあるが材料の強度水準,組織との相関は認められない.
2)降伏応力が275N/mm2から834N/mm2,引張強さが441N/mm2から1010N/mm2,伸びが7.5%から37%の範囲では,機械的性質の違いによるΔKthの変化はRの違いによるΔKthの変化に比べ小さく,同一RでのΔKthは機械的性質が変わつても2倍の範囲に含まれる.なお,da/dnが速くなるほど同一のR,同一のda/dnを与えるΔKは狭い範囲に集中する傾向を示す.
3)da/dnが速い領域では金属組織が異なつても疲れき裂伝ぱ特性に明瞭な差異は認められない.また,ΔKthについては,フェライトパーライト鋼が焼もどしマルテンサイト鋼よりいくぶん大き目の値を示す傾向にある.
4)試験した範囲内で,疲れき裂伝ぱ特性とΔKthを変化させる最大の要因は応力比であり,これに比べ機械的性質や金属組織の寄与は少ない.抄録全体を表示PDF形式でダウンロード (968K) -
的場 幸雄, 平田 賢, 遠藤 倫正1983 年 69 巻 7 号 p. 874-879
発行日: 1983/05/01
公開日: 2009/06/30
ジャーナル オープンアクセスPDF形式でダウンロード (4320K) -
中村 文夫, 大沼 啓明, 梶原 正憲, 増田 千利, 片田 康行, 升田 博之, 吉田 和彦1983 年 69 巻 7 号 p. 884-886
発行日: 1983/05/01
公開日: 2009/06/30
ジャーナル オープンアクセスPDF形式でダウンロード (820K) -
1983 年 69 巻 7 号 p. N88
発行日: 1983年
公開日: 2009/06/30
ジャーナル オープンアクセスPDF形式でダウンロード (127K)
- |<
- <
- 1
- >
- >|