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70 巻, 2 号
選択された号の論文の22件中1～22を表示しています
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中尾 嘉邦1984 年 70 巻 2 号 p. 151-157
発行日: 1984/02/01
公開日: 2009/06/30
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谷野 満1984 年 70 巻 2 号 p. 158-165
発行日: 1984/02/01
公開日: 2009/06/30
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森 隆資1984 年 70 巻 2 号 p. 165
発行日: 1984/02/01
公開日: 2009/06/30
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金属材料を中心に佐々木 雄貞, 遠藤 紘1984 年 70 巻 2 号 p. 166-170
発行日: 1984/02/01
公開日: 2009/06/30
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永田 宏二1984 年 70 巻 2 号 p. 171-177
発行日: 1984/02/01
公開日: 2009/06/30
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柴田 充蔵, 和島 正已, 相馬 英明, 松岡 宏1984 年 70 巻 2 号 p. 178-185
発行日: 1984/02/01
公開日: 2009/06/30
ジャーナル フリーPermeability experiments have been performed for each characteristic zones (moisture condensation, drying, reaction, melting and cake zone).
The analysis of reaction zone is satisfactorily made by combination of static experimental test and mathematical dynamic model in sintering process.
By this model including pressure drop equation of each zones, calculations are made simultaneously for the variation of heat transfer, moisture transfer, reactions of coke and limestone, melt of solid and suction gas volume rate.
It is concluded that the total gas volume is determined by the ratio of the specific heat of material to that of suction gas, independing on suction pressure or bed height.抄録全体を表示PDF形式でダウンロード (1146K) -
水渡 英昭, 井上 亮1984 年 70 巻 2 号 p. 186-193
発行日: 1984/02/01
公開日: 2010/02/16
ジャーナル フリー本研究で得られた結果を要約すると以下のとおりである.
1) CaO-MgOsat.-FetO-SiO2-P2O5系スラグ-溶鉄間のりん分配比のデータから次の3つの脱りん関係式を導出した.
a) logkP=0.145{(%CaO)+0.3(%MgO)-0.5(%P2O5)}+22 810/T-20.506
b) logkP=7.87 log{(%CaO)+0.3(%MgO)-0.05(%FetO)-0.5(%P2O5)}+22 240/T-27.124
c) log(%P)/{[%P]・(%T.Fe)5/2}=0.0720{(%CaO)+0.3(%MgO)+0.6(%P2O5)}+11 570/T-10.520
2) CaO-MgOsat.-FetO-SiO2-P2O5-MnO系スラグ-溶鉄間のりん分配比のデータから上記1)項の3つの式の右辺第一項の(%MnO)の係数を求めた.その結果,a),b),c)式共その係数は0.6となつた.
3) CaO-MgOsat.-FetO-SiO2-P2O5系スラグのP2O5の活量係数の対数はTURKDOGANとPEARSONの関係式を用いて次式で与えられる.
logγP2O5=-1.02(23NCaO+17NMgO+8NFetO-26NP2O5)-22 990/T+9.490
さらにCaO-MgOsat.-FetO-SiO2-P2O5-MnO系スラグについてのデータから上記の右辺第一項のNMnOの係数は13と求められた.
4) CaO-MgOsat.-FetO-SiO2-P2O5系スラグのFetOの活量係数の対数は重回帰解析の結果,SiO2のモル分率に相関があることが明らかとなつた.logγFetOとNSiO2,との関係のプロットにおいてP2O5濃度の増加によりlogγFetOは増加した.抄録全体を表示PDF形式でダウンロード (1311K) -
水上 秀昭, 小松 政美, 北川 融, 川上 公成1984 年 70 巻 2 号 p. 194-200
発行日: 1984/02/01
公開日: 2009/06/30
ジャーナル フリーIt is commonly observed that severe V-channel segregates are associated with the equiaxed zone in the central region of a strand. This type of segregation may deteriorate the product qualities especially for sour gas service. The modification of V-segregates is found to be attained by electromagnetic stirring at the final stage of solidification. The laboratory scale stirring experiments have been carried out in order to eliminate V-segregation and the following results have been obtained.
1) V-segregation streaks can be eliminated by linear or rotary type stirrer at the final stage of solidification.
2) The upward flow of molten steel at the solidification front which may prevent the inter-dendritic liquid flow toward the bottom is effective.
3) In the case of stirring by rotary type stirrer, adequate amount of fine equiaxed crystals is necessary. Alternating stirring at the final stage of solidification may prevent coagulation of equiaxed crystals and modify the packing of them.
4) It was found that only weak stirring is enough.
5) It is important to time the stirring to the progress of solidification. Optimum stirring period should be aimed at right after the precipitation of crystals, fraction of solid equals to 0.1 at the center of a strand.抄録全体を表示PDF形式でダウンロード (4973K) -
奥村 治彦, 大西 邦彦1984 年 70 巻 2 号 p. 201-207
発行日: 1984/02/01
公開日: 2009/06/30
ジャーナル フリーRoller forces were measured for the straightening zones (a vertical bending zone and an unbending zone) of a continuous casting machine of a vertical bending type, and the obtained data were analyzed. Further, some numerical calculations were carried out and the measured values of the roller forces were analyzed theoretically.
The following facts were elucidated :
(1) Very large roller forces appear when a slab head or a slab tail goes through the unbending zone.
(2) The roller forces are larger at the exit of the unbending zone than those at the entrance.
(3) The correlation between roller forces and slab width is not distinct and contrary to usual anticipation, the roller forces are not proportional to slab width.
(4) The characteristics of the straightening forces in the vertical bending zone are the same as those in the unbending zone.抄録全体を表示PDF形式でダウンロード (1076K) -
藤原 昭文, 藤野 眞之1984 年 70 巻 2 号 p. 208-215
発行日: 1984/02/01
公開日: 2009/06/30
ジャーナル フリーAn approximate analytical equations were derived to calculate the stress state of cylindrical structure that is constructed by fire-bricks, stamp, joint-mortar and shell.
In the analysis gradual heating process was assumed, and non elastic behavior was neglected. The main objects are to get the compression field that is made by constraint of thermal expansion, and the tensile stress that is caused by partial compressive loading.
The analytical solution was compared with that by FEM. The former has little error. This error, however, has no objection to design or to evaluate real furnace.
Numerical calculation was done to clarify the effect on stress of design parameters of blast furnace hearth refractories, i.e. Young's modulus of fire-brick, that of stamp, length of fire-brick and thermal conductivity, etc..抄録全体を表示PDF形式でダウンロード (1093K) -
奥村 直樹, 南雲 道彦, 井上 泰, 山本 広一1984 年 70 巻 2 号 p. 216-223
発行日: 1984/02/01
公開日: 2009/06/30
ジャーナル フリーSignificance of hot rolling to produce heavy plates from continuously-cast slabs with low carbon and low alloying elements is analyzed from metallurgical point of view, special attention being paid to the influence of solidification structure on the mechanical properties of plates. The major conclusions are as follows ; a) Brittle fracture characteristics (vTrs) is not affected by microsegregation existing in either columnar dendrites or equiaxed grains. b) The appropriate reduction ratio in terms of mechanical properties in the thru-thickness direction is approximately 1.5-3, depending on the rolling shape factor which is a function of slab thickness, radius of rolls, and reduction per pass. c) Some elements such as S, P, Mn, N, and C are detected by an Auger electron microscope on the surface of center porosities which can be annihilated by hot rolling. Based upon the results it is suggested that combination of fine initial austenite grain, large rolling shape factor, and low total reduction ratio is a sufficient condition to procure sound mechanical properties of heavy plates manufactured from continuously-cast slabs.抄録全体を表示PDF形式でダウンロード (3318K) -
大貫 輝, 柴田 嘉基, 野田 勝利, 中島 浩衛1984 年 70 巻 2 号 p. 224-231
発行日: 1984/02/01
公開日: 2009/06/30
ジャーナル フリーPlug life of PRP (Press Roll Piercer) process, in which a square bloom is directly pierced and rolled simultaneously, is strongly affected by its own shape. A plug with a sharp conical top thrusts through the solid material to get galled in the earlier stage by metal flow on its surface. On the other hand, a plug with dull top or a flat top has a longer life, since it is protected by dead metal induced in front.
As for plug material, conventional tool steel for hot metal forming is durable enough, only if surface scale layer is formed before use. The product quality is also influenced by plug shape. Especially dull one is advantageous.抄録全体を表示PDF形式でダウンロード (4017K) -
菊池 実, 梶原 正憲, 角屋 好邦, 臼木 秀樹, 田中 良平1984 年 70 巻 2 号 p. 232-237
発行日: 1984/02/01
公開日: 2010/02/16
ジャーナル フリーTo determine experimentally the solubility of a tungsten-rich bcc α2 phase in a nickel-rich fcc γ phase in a Ni-Cr-W-Mo quaternary system, four Ni-Cr-W-Mo alloys with 0.03wt pct carbon, whose compositions were in a γ+α2 phase field, were equilibrated at 1 000, 1 100, 1 200, and 1 300°C for 8 000, 4 500, 100, and 100h, respectively. Chemical compositions of the constituent phases were determined by means of electron microprobe analysis. Tie-lines between γ and α2 phases and γ/(γ+α2)/α2 phase boundaries were constructed in four isothermal sections of the Ni-Cr-W-Mo quaternary equilibrium phase diagram. The solubility of α2 in γ decreased with decreasing temperatures. Precipitation of carbides such as M6C and M12C at lower temperatures apparently lead to further decrease in the α2 solubility.抄録全体を表示PDF形式でダウンロード (2948K) -
梅本 実, 大塚 秀幸, 田村 今男1984 年 70 巻 2 号 p. 238-245
発行日: 1984/02/01
公開日: 2009/06/30
ジャーナル フリー加工硬化したオーステナイトからの拡散変態のkineticsの研究の一環として本研究ではkineticsの取り扱いが比較的容易なパーライト変態をとりあげ,共析鋼に近いSKD 6を使つて未再結晶域で30%圧延することによつてパーライト変態がどのような影響をうけるのかについて研究をおこなつた,得られた主な結果は次のとおりである.
(1)加工により,パーライト変態は著しく促進される.
(2)パーライトの成長速度に対する加工の影響は30%圧延ではほとんど認められない.
(3)パーライトの核生成場所は無加工材ではほとんどオーステナイト粒界であるが,加工により粒内の焼鈍双晶境界や変形帯,その他(非金属介在物との界面など)にもパーライトが生成するようになる.これらオーステナイト粒内で核生成するパーライトの変態率は30%圧延を施した場合全変態率の約25%であつた.
(4)粒界面上での単位面積当たりの核生成速度は30%圧延により約27倍増加する.抄録全体を表示PDF形式でダウンロード (7750K) -
松村 直己, 時実 正治1984 年 70 巻 2 号 p. 246-253
発行日: 1984/02/01
公開日: 2009/06/30
ジャーナル フリーMicrostructure and tensile properties of a dual-phase (martensite + ferrite) Fe-2.3%Mn-0.05%C-0.03%Nb steel produced by intercritical annealing of martensitic specimens have been studied. In order to assess the effects of prior austenite grain size on microstructure and tensile properties of the dual-phase steel, the martensitic specimens with widely different prior austenite grain sizes were prepared by thermal cycling and thermomechanical processing. Coarse dual-phase structure consisting of fibrous martensite and ferrite was obtained by intercritical annealing of the specimens with coarse prior austenite grain size. A characteristic fine dual-phase structure consisting of homogeneously dispersed fine martensite particles and fine ferrite grains was obtained by the intercritical annealing of the specimens with ultra fine prior austenite grain size. The fine dual-phase structure was superior in both strength and ductility to the coarse dual-phase structure over a wide range of martensite volume fractions examined. It is concluded that better combination of strength and ductility of the dual-phase steel is achieved by intercritical annealing of the martensitic specimens with ultra fine prior austenite grain size which is obtained by the thermomechanical processing.抄録全体を表示PDF形式でダウンロード (11648K) -
岩渕 義孝, 竹之内 朋夫, 宮本 剛汎, 藤田 哲夫1984 年 70 巻 2 号 p. 254-261
発行日: 1984/02/01
公開日: 2010/02/16
ジャーナル フリーEffect of lowering Si content on the porosity frequency, rupture strength and weldability of Cr-Mo-V large castings for turbine casing and valve was investigated, using large test specimens taken from valve castings having low and high Si content. The results are summarized as follows.
(1) Deoxidation of low Si cast steel is achieved completely by 0.1% Fe-Ti addition.
(2) Low Si casting has no inverse V segregation and small amounts of porosity as the results of fine dendrite structure.
(3) There is no difference, between low Si and conventional Si castings, in hardenability and strength at ambient temperature to 566°C.
(4) Creep rupture strength is improved by lowering Si content.
(5) Low Si casting possesses better weldability concerning cold cracking and reheat cracking than conventional Si casting.抄録全体を表示PDF形式でダウンロード (14511K) -
小林 孝雄, 伊藤 卓雄, 大林 幹男1984 年 70 巻 2 号 p. 262-268
発行日: 1984/02/01
公開日: 2009/06/30
ジャーナル フリーThe isothermal and cyclic oxidation behavior of Fe-26%Cr-21%Ni-1.8%Si alloys with and without superficial Y2O3 powder application as well as similar alloys containing 0.02% and 0.34%Y was examined in air at 1100°C.
The oxide scales on the surface of yttrium-containing alloys consisted of (Cr, Fe)2O3, and had excellent adherence to the alloy substrate even in cyclic oxidation. No void formation was observed at the alloyoxide interface, and no silicon-rich inner layer was developed. Such effects of yttrium addition were recognized to be significant even in a fairly early stage of oxidation.
The superficially applied Y2O3 powder on the alloy improved the scale adherence, and provided the oxidation morphology similar to that of the yttrium-containing alloy. The effect of Y2O3 powder was also observed in preoxidized specimens.抄録全体を表示PDF形式でダウンロード (10015K) -
藤井 忠臣, 堀田 隆一, 野村 和夫1984 年 70 巻 2 号 p. 269-276
発行日: 1984/02/01
公開日: 2009/06/30
ジャーナル フリーThe effect of temper embrittlement on hydrogen embrittlement was investigated on 2 1/4 Cr-1Mo steel for high-temperature and high-pressure vessels. The threshold stress intensity, KIH, for hydrogen-stress cracking (HSC) was determined by immersing modified 1T-WOL specimens with and without stepcooling heat treatment into a H2S-saturated 0.5% acetic acid solution.
The results obtained are summarized as follows :
(1) Temper embrittlement enhances the susceptibility to hydrogen embrittlement of grain boundary.
(2) The KIH value decreases with increase of fracture surface transition temperature, vTrs(°C), grain size, d(mm), and hydrogen content, C(ppm).
(3) The KIH value has a good correlation with the hydrogen embrittlement susceptibility factor, Φ, denoted by
Φ=0.05d-1/5 (vTrs + 133) + 4 (log d2 + C1/3)
(4) On the basis of the relation between KIH and Φ and some diagrams to determine the maximum residual hydrogen content in a pressure vessel wall, a safety estimation method for preventing HSC during hydrostatic test of pressure vessels after the service was proposed.抄録全体を表示PDF形式でダウンロード (1383K) -
大坪 孝至, 後藤 俊助, 天野 実1984 年 70 巻 2 号 p. 277-284
発行日: 1984/02/01
公開日: 2009/06/30
ジャーナル フリーA new apparatus for the determination of diffusible hydrogen in steel has been developed by using a gaschromatograph, thermal conductivity detector, and sequencer.
The characteristics of the apparatus are as follows :
1) The lower limit of detection is 10-5ml (N.T.P.), that is 5 × 10-4ppm for 2g specimen.
2) The minimum cycle time of measurement is 3min.
3) Fifteen samples can be measured in parallel when the measurement is carried out every one hour.
4) The measurement shown above is automatically carried out by a programed sequencer.
5) The coefficient of variance of results (approximately 4ml/100g) is about 1%.
The apparatus is useful not only for determination of diffusible hydrogen in weld metal but also for determination of diffusivity of hydrogen in iron, alloy-steel and thin foil of amorphous iron and for measurement of permeability of hydrogen through steel.
It was also revealed that for low hydrogen content specimens the glycerine volumetric method gave much lower results than those obtained by the present method.抄録全体を表示PDF形式でダウンロード (1159K) -
川上 正博, 富本 登, 北沢 康憲, 奥山 優, 伊藤 公允, 鶴田 敬一, 杉浦 卓1984 年 70 巻 2 号 p. 285-292
発行日: 1984/02/01
公開日: 2009/06/30
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宮川 大海1984 年 70 巻 2 号 p. 290
発行日: 1984/02/01
公開日: 2009/06/30
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上谷 年男, 菅原 健, 原 隆三, 田中 千秋, 門馬 義雄, 宮地 博文, 安中 嵩1984 年 70 巻 2 号 p. 293-294,292
発行日: 1984/02/01
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (748K)
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