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Volume 27, Issue 4
Displaying 1-8 of 8 articles from this issue
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Masahisa NAKAMURA1977Volume 27Issue 4 Pages 159-160
Published: April 30, 1977
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDownload PDF (305K) -
Chozo YOSHIMURA, Akira YAGYU1977Volume 27Issue 4 Pages 161-167
Published: April 30, 1977
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSContact angles θ of various liquids to different anodic oxide films produced in acid baths (sulfuric and oxalic acids) and alkaline baths (ammonium hydroxide and fluoride mixture, ethylenediamine and ammonium carbonate) were measured. The anodic oxide films formed in the alkaline baths are more wettable to distilled water than those formed in the acid baths, but are less wettable to oils. The films produced in the alkaline baths are hardly wet by basic organic solvents and are more easily wet by acid solvents than those produced in the acid baths. Wetting of the films to aqueous solutions dissolving gases is accelerated in accordance with gas concentration probably by a corrosive action of the dissolved gases.View full abstractDownload PDF (778K) -
Hiroshi TOKISUE, Kenichiro AOKI1977Volume 27Issue 4 Pages 168-174
Published: April 30, 1977
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSFractography was made on impact tested specimens of the Al-Si alloys (4-20%Si) solidified under the hydrostatic pressure up to 30kgf/mm2. A lateral contraction phenomenon was found just under the notch in the hypoeutectic alloys. The alloys containing low or high quantities of Si showed rough fractures. The alloys near the eutectic composition showed flat fractures. All the alloys solidified under 1 atm showed cleavage fractures. The Al-20%Si alloy showed a cleavage fracture independent of the applied pressure. The dimples were observed both on the fractures of the hypo and hypereutectic alloys solidified under the pressure above 10 and 20kgf/mm2 respectively. Inclusions were recognized at the bottom of all the dimples.View full abstractDownload PDF (1957K) -
Moritaka HIDA, Kunio UEMURA, Tadashi TAKAOKA, Mutsuo OHTA1977Volume 27Issue 4 Pages 175-180
Published: April 30, 1977
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSVicker;s hardness tests were made on the view point of the formative conditions of G. P. Zones (G. P. 1), θ" zones (G. P. 2) and θ' phase. Quench hardening caused by θ" zones and G. P. zones is found at quenching temperatures from 300° to 500°C. The θ" zones are easily formed at the quenching temperature bellow the solubility limit (490°C). The first step age hardening of this alloy at 140°C is attributed to θ" zones and not to G. P. zones. Those zones are completely reversed at 200°C (solubility limit of G. P. zones TG.P. = 190°C for this alloy). The second step hardening at 140°C is due to θ' phase being formed independently of θ" zones in the solution. The θ' phase is formed more rapidly at 200°C in the supersaturated solid solution in which zones have been already formed than in the solid solution yet free from the zones.View full abstractDownload PDF (718K) -
Masamitsu SUZUKI, Ikuya OHSHIMA, Takemi YOSHIDA, Takao SHIBATA1977Volume 27Issue 4 Pages 181-188
Published: April 30, 1977
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSA wet, orthogonal and slow speed machining test was performed to determine an independent effect of cutting speed on the shear stress. The test meets the requirements of constant temperature and freedom from a built-up edge. The stress τs on the shear plane (kgf/mm2) are expressed as a function of the cutting speed V (mm/min) or the shear strain rate γ (sec(-1)).
τs = τ1Vn(1)
τs = τ1'γm(2)
Where, τ1: Shear stress when V is 1mm/min, τ1': Shear stress when γ is 1 sec(-1), n: Exponent of cutting speed sensitivity, and m: Exponent of shear strain rate sensitivity. If γ in equation (2) is assumed as shown in equation (3), m equals n.
γ=Vs/t1(3)
Where, Vs: Shear speed on the shear plane (mm/sec), and t1: Depth of cut (mm). n and m in equations (1) and (2) are changed in the range from 0.052 to 0.092 with the rake angle of the tool and the depth of cut.View full abstractDownload PDF (1779K) -
Norikatsu BECK, Osamu UEDA1977Volume 27Issue 4 Pages 189-192
Published: April 30, 1977
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSJIS permanent mold castings of the AC4C alloys containing 0.09 to 0.58% Fe were heat treated under different conditions to derive practical data for selection of heat treating conditions and limits of Fe contamination. Contamination of Fe has little effect on the aging characteristics. The castings containing Fe up to 0.09% are retarded in aging to some degrees. Increase in Fe contents lowers ductility but has little effect on yielding strength and hardness. For the AC4C castings containing Fe up to 0.14%; i) aging, for instance, at 170°C for 8 to 24hr or at 180°C for 4 to 12hr ensures the tensile strength 31kg/mm2 or more and yield strength 26kg/mm2 or more. ii) Aging, for instance, at 150°C for 4hr or less ensures the elongation 15% or more and impact strength 1.0kg-m/cm2 or more.View full abstractDownload PDF (796K) -
Eikichi UEKI1977Volume 27Issue 4 Pages 193-207
Published: April 30, 1977
Released on J-STAGE: July 23, 2008
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1977Volume 27Issue 4 Pages e1
Published: 1977
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDownload PDF (62K)
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