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Sagamihara, Japan

A manufacturing device for a cast bar and tube includes a molten metal furnace for holding a dissolved casting material, a hollow tube having a penetrating part of molten metal for penetrating molten metal, a depressurization device for reducing the pressure, a connection member for connecting the hollow tube to the depressurization device, and an open/close type valve member installed on the connection member. The penetrating part of molten metal is depressurized by switching the valve member to the closed state to reduce the pressure in the side of the depressurization device from the valve member using the depressurization device and inserting an opening of the hollow tube into the molten metal furnace as well as by switching the valve member to the open state.

Ito T.,Gonda Metal Industry Co. | Noda M.,Chiba Institute of Technology | Mori H.,Railway Technical Research Institute | Gonda Y.,Gonda Metal Industry Co. | And 2 more authors.
Materials Transactions | Year: 2014

We investigated the effect of the cooling rate and molten metal temperature on the microstructure and mechanical properties of a subrapidly solidified magnesium alloy, Mg10Al0.2Mn1Ca, prepared by antigravity suction casting using a water-cooled steel mold. The microstructure of the antigravity-suction-cast material without water cooling consisted of coarse grains (grain size: 780 μm), with networks of an AlCa compound at the grain boundaries. The higher cooling rate of the water-cooled steel mold promoted the formation of the AlCa compound and voids in accordance with increases in the internal and external temperature gap and differences in the solidification rate of the mold. The formation of voids and the shrinkage were suppressed, however, by adjusting the cooling rate and decreasing the molten metal temperature. The particle size of the Mg phase was refined to 135μm and the grain-boundary compounds were finely dispersed in the Mg phase. The as-cast alloy showed an ultimate tensile strength of 166 MPa and an elongation of 8%. The microstructure and mechanical properties of the as-cast alloy were dependent on the cooling rate and molten metal temperature, but they were not dependent on the casting speed. ©2014 The Japan Institute of Metals and Materials.

Ito T.,Gonda Metal Industry Co. | Yanagihara S.,Gonda Metal Industry Co. | Noda M.,Gonda Metal Industry Co. | Mori H.,Railway Technical Research Institute
Keikinzoku/Journal of Japan Institute of Light Metals | Year: 2015

The effect of heat treatment and dynamic recrystallization (DRX) on the microstructure, mechanical properties and limited reduction in thickness of the as cast Mg-10Al-0.2Mn-1Ca mass% (AMX1001) alloy was investigated in this study. The Mg17Al12 phases and Al-Ca compounds appeared in the as cast alloy. The Mg17Al12 phase mostly dissolved into the Mg matrix, and Al2Ca compound dispersed discontinuously surrounding the grain boundaries. The area fraction of the compounds in the heat treatment material decreased from 16% to 4% with increasing annealing temperature after the optimized heat treatment at 490°C for 6 h. Tensile strength and elongation of 253 MPa and 8% respectively were observed after heat treatment DRX occurred during the hot upsetting test of heat treated AMX1001 alloy with Al2Ca compounds at the newly formed DRXed grain boundaries. With the decrease of compounds and increase of upsetting test temperature, the limited reduction in thickness of AMX1001 cast alloy reached 50%. Because of consider an alternate rephrasing as the dispersion of fine Al2Ca compound receiving the promotion of fine Al2Ca compound and introduction of shear deformation associated with the processing, the area fraction of the DRXed grains was increased.

Funami K.,Chiba Institute of Technology | Noda M.,Chiba Institute of Technology | Gonda Y.,Gonda Metal Industry Co. | Gonda G.,Gonda Metal Industry Co. | Mori H.,Railway Technical Research Institute
8th Pacific Rim International Congress on Advanced Materials and Processing 2013, PRICM 8 | Year: 2013

Twin-roll-cast AMX magnesium alloys have recently been developed as a lightweight flame retardant alloy for use in automotive and railway vehicles. However, magnesium alloys containing Ca show inferior plastic deformation and poor formability. In this study, we have developed an extraordinarily high strength and elongation rare-earth-free magnesium alloy by multi-pass rolling of a Mg-10Al-0.2Mn-1Ca (wt.%) twin-roll-cast alloy. The as-rolled sample exhibited a yield stress of 380 MPa, tensile strength of 400 MPa, and elongation to failure of 8 % as a result of grain refinement. The recrystallized region of the rolled material accounted for 70 %, and the mean grain size was 1.4 μm. In addition, excellent rollability was found over a wide range of rolling temperatures, with the maximum reduction in the thickness being twice as large as that in other magnesium alloys containing Ca.

Yatsushiro K.,Yamanashi Industrian Technology Center | Suzuki D.,Yamanashi Industrian Technology Center | Sano M.,Yamanashi Industrian Technology Center | Ishiguro T.,Yamanashi Industrian Technology Center | And 4 more authors.
Zairyo/Journal of the Society of Materials Science, Japan | Year: 2014

For the application to the structure part of the magnesium alloy, material evaluations such as mechanical strength, fatigue property and property of stress corrosion cracking are necessary. Therefore, the X-ray stress measurement that is Non-destructive inspection is effective technique. However, there are few reports that described X-rays stress measurement about magnesium alloy. The report considered about X-ray elastic constant and stress constant in detail is not found. In this report, X-ray elastic and stress constants of rolled AZ61 magnesium alloy were measured. As result, by removing surface layer that has anelastic behavior and considering texture of specimen, X-ray elastic and stress constants can be measured. The X-ray elastic constants of AZ61 magnesium alloy in as received specimens were 41.2 GPa by using 1014 diffraction and 39.9 GPa by using 1015 diffraction. © 2014 The Society of Materials Science, Japan.

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