Effect of initial microstructures on hot forging of Ca-containing cast Mg alloys

Hakamada, Masataka; Shimizu, Kazunori; Yamashita, Tomokazu; Watazu, Akira; Saito, Naobumi; Iwasaki, Hajime

doi:10.1007/s10853-009-3990-x

Cited by 15 publications

(5 citation statements)

References 23 publications

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“…Tensile tests at RT and 300 • C with 0.001, 0.01, 0.1 and 1 s −1 showed an overall improvement of the tensile properties in the deformed samples when compared to as-cast material as well as large elongations to failure (284 %) of the AZX911 material at 300 • C. At RT the Ca containing alloy showed an increased YS but reduced ductility in general. The influence of different grain sizes on the forming behavior of as-cast AZX911 was investigated in Reference [113] by compression tests at 250, 300 and 330 • C using 0.01, 0.1 and 1 s −1 up to a true strain of 1.6. A finer initial grain structure showed a slightly higher flow stress but considerably better free surface quality.…”

Section: Mg-al-ca-systemmentioning

confidence: 99%

Mg-Alloys for Forging Applications—A Review

et al. 2020

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Interest in magnesium alloys and their applications has risen in recent years. This trend is mainly evident in casting applications, but wrought alloys are also increasingly coming into focus. Among the most common forming processes, forging is a promising candidate for the industrial production of magnesium wrought products. This review is intended to give a general introduction into the forging of magnesium alloys and to help in the practical realization of forged products. The basics of magnesium forging practice are described and possible problems as well as material properties are discussed. Several alloy systems containing aluminum, zinc or rare earth elements as well as biodegradable alloys are evaluated. Overall, the focus of the review is on the process control and processing parameters, from stock material to finished parts. A discussion of the mechanical properties is included. These data have been comprehensively reviewed and are listed for a variety of magnesium forging alloys.

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Section: Mg-al-ca-systemmentioning

confidence: 99%

Mg-Alloys for Forging Applications—A Review

et al. 2020

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“…These results indicate that AZCa912 bars with a DAS of around 11-23 µm can be deformed at temperatures above 350 °C and at strain speeds below 0.1/s. Under these conditions, a bar can be deformed by a servo press machine [6][7][8][9][10].…”

Section: Thermec 2016mentioning

confidence: 99%

Microstructure of AZCa912 Continuous Casting Bar after Hot Compression

Watazu

Omura

Miwa

2016

MSF

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AZCa912, 8.8mass%Al-0.68mass%Zn-0.25mass%Mn-1.9mass%Ca-Bal.Mg, continuous casting bars with 50 mm in diameter were formed by a direct chill continuous casting method. AZCa912 alloy is a noncombustible magnesium alloy. The surfaces of the bars had excellent metallic luster. A dendrite structure with a DAS of around 11-23 μm and grain sizes of about 200 μm was observed. Samples with almost the same grain size and different DAS were measured at hot compression test at 250-350°C, 0.01-1/s. Crack on the side surfaces of the samples were not formed by compression at 350°C, 0.01-0.1/s. All samples had an unchanged casting structure after hot pressing, and the percent of the structure remaining unchanged decreased with low-temperature compression and wide DAS.

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“…Peng et al 12) evaluated the mechanical properties of MgGd based alloys such as the hardness and grain size distribution according to the heat treatment conditions and duration time. Hakamada et al 13) demonstrated that the reduction in dendrite arm spacing in the casted Mg alloy is essential to induce uniform recrystallization because the second phases as well as grain boundaries provide sites for recrystallization. Chino et al 14) investigated microstructure and mechanical properties of the forged Mg alloy in which refined and homogeneous microstructure of pre-forging specimen provides good quality of the forged part.…”

Section: )mentioning

confidence: 99%

“…13) A scroll compressor uses two interleaving scrolls such as the fixed and orbit scrolls to pressurize liquids and gases; the orbit scroll revolves around the fixed scroll eccentrically to trap and compress pockets of fluid between two scrolls. It not only provides volumetric efficiency, because a pair of scrolls operates in a small space, but also operates more quietly and reliably than conventional compressors because the gas compression processes in the scroll compressor are continuous.…”

Section: Introductionmentioning

confidence: 99%

Effect of Initial Microstructure on Mg Scroll Forging under Warm Forming Condition

Yoon

Lee

2014

Mater. Trans.

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Magnesium (Mg) alloys have attracted considerable interest for various applications, including those in the automotive and electronics industries, because of their high specific strength, excellent thermal conductivity, and recycling capability in comparison with commonly used aluminum alloys and steels for structural materials. One of the core parts in the compressor unit of an automobile is the scroll rotor, which is assembled with two scrolls, a rotating orbit scroll on the fixed scroll, to compress the refrigerant. In this study, we proposed a net-shape forging process and an apparatus with the back-pressure technique for the Mg scroll at a forging temperature of 350°C with an Mg6Al1Zn extruded billet. The optimum amount of back-pressure is calibrated by finite element analysis using DEFORM-3D, which enhances the wrap height distribution in the Mg scroll uniformly. To elucidate the effect of the initial texture on the forgeability of the Mg scroll, twin-induced and dynamic recrystallization (DRX)-induced specimens are applied in Mg scroll forging, where the formability of the Mg scroll with the DRXinduced specimen is found to be noticeably improved in terms of the wrap height.

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Effect of initial microstructures on hot forging of Ca-containing cast Mg alloys

Cited by 15 publications

References 23 publications

Mg-Alloys for Forging Applications—A Review

Mg-Alloys for Forging Applications—A Review

Microstructure of AZCa912 Continuous Casting Bar after Hot Compression

Effect of Initial Microstructure on Mg Scroll Forging under Warm Forming Condition

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