415 金属材料の曲げ加工性評価(OS4-(4)オーガナイズドセッション《材料と組織》)

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High bendability as well as high strength and high electrical conductivity has been being demanded in copper alloys for the use of connectors where bending with small radius is performed, as electric and electronic components have been miniaturized. With this trend, speedy and quantitative assessment of bendability has also been being demanded. Although there have been several methods to assess the bendability of metal materials, none of them do not seem to have both speediness and quantitativeness. Two of the authors have recently proposed a new bendability-assessing method in aluminium alloys for autobody sheet based on the principle that the resistivity of the test piece increases because of the decrease in cross section area when cracking occurs during the bending deformation. The aim of the present study is to investigate the applicability of the new assessing method to a Corson series copper alloy that is currently used for connectors but still is required for further improvement in bendability. Test pieces of 0.23mm in thickness were prepared from the alloy sheet solution-treated at 800℃ for 1h and successively treated in three ways: i) water-quenched and subsequently aged at 480℃ for 3h, ii) water-quenched and iii) furnace cooled. Bending was carried out in two steps: firstly up to 90° using a pair of jigs for W-bending, and secondly up to 180°, both with inner radius of 0.0625mm. Resistivity was measured by means of four-terminal method at room temperature, before and after the W-bending and after the final bending. The obtained results showed that the resistivity increases in rough accordance with decreasing the bendability previously reported for the same specimen, and that the resistivity increase corresponds well to the occurrence of the crack on the tension surface as well as the expansion in thickness and reduction in length on the compression surface.
一般社団法人日本機械学会の論文
2010-08-27

415 金属材料の曲げ加工性評価(OS4-(4)オーガナイズドセッション《材料と組織》)

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