1) 部分溶融-水冷試験を行って、室温から加熱中冷間工具鋼SKD11と熱間工具鋼SKD61微細組織の変化を解明しました。 2) 冷間工具鋼SKD11と熱間工具鋼SKD61を1300 と 1405℃に加熱して、均一な球状微細組織を得られた。合金元素の分布は結晶粒径に影響します。 3) 温度は冷間工具鋼SKD11と熱間工具鋼SKD61の微４．まとめ 本研究のまとめは以下３点がとなります。 細組織と成形特性に影響します。 本研究は天田財団の奨励研究助成のご支援を受けて実施しました。また、日本塑性加工学会、東京大学生産技術研究所柳本潤先生と柳本研究室の皆様に感謝します。 1) Atkinson, H., Rassili, A., 2010. Atkinson, H., Rassili, A. (Eds.), Thixoforming steel. Shaker Verlag, Aachen, Germany, pp. 13-18. 2) Finkler, H., Schirra, M., 1996. Transformation behaviour of the high temperature martensitic steels with 8 - 14% chromium. Steel Res. Int. 67, 328-342. 3) Flemings, M.C., 1991. Behavior of metal alloys in the semisolid state. Met. Trans. 22A, 957-981. 4) Kirkwood, D.H., Sellars, C.M., Eliasboyed, L.G., 1991. Fine grained metal composition. US Patent 5,037,498. 5) Li, J., Sugiyama, S., Yanagimoto, J., 2005. Microstructural evolution and flow stress of semisolid type 304 stainless steel. J. Mater. Process. Technol. 161, 396-406. 6) Li, J., Sugiyama, S., Yanagimoto, J., Chen, Y., Guan, W., 2008. Effect of inverse peritectic reaction on microstructural spheroidization in semisolid state. J. Mater. Process. Technol. 208, 165-170. 7) Meng, Y., Sugiyama, S., Yanagimoto, J., 2012. Microstructural evolution during RAP process and deformation behavior of semisolid SKD61 tool steel. J. Mater. Process. Technol. 212, 1731-1741. 8) Meng, Y., Sugiyama, S., Yanagimoto, J., 2014. Effects of heat treatment on microstructure and mechanical properties of Cr–V–Mo steel processed by recrystallization and partial melting method. J. Mater. Process. Technol. 214, 87-96. 9) Meng, Y., Sugiyama, S., Soltanpour, M., Yanagimoto, J., 2013. Effects of predeformation − 245 −謝 辞 参考文献 and semisolid processing on microstructure and mechanical properties of Cr-V-Mo steel. J. Mater. Process. Technol. 213, 426-433. 10) Metals Handbook, 1998. Vol. 15. 9th ed., ASM International, OH, pp. 306-314. 11) Omar, M.Z., Atkinson, H.V., Palmiere, E.J., Howe, A.A., Kapranos, P., 2004. Microstructural development of HP9/4/30 steel during partial remelting. Steel. Res. Int. 75, 552-560. 12) Omar, M.Z., Palmiere, E.J., Howe, A.A., Atkinson, H.V., Kapranos, P., 2005. Thixoforming of a high performance HP9/4/30 steel. Mater. Sci. Eng., A 395, 53-61. 13) Püttgen, W., Hallstedt, B., Bleck, W., Uggowitzer, P.J., 2007a. On the microstructure formation in chromium steels rapidly cooled from the semisolid state. Acta Mater. 55, 1033-1042. 14) Püttgen, W., Hallstedt, B., Bleck, W., Löffler, J.F., Uggowitzer, P.J., 2007b. On the microstructure and properties of 100Cr6 steel processed in the semisolid state. Acta Mater. 55, 6553-6560. 15) Rassili, A., Atkinson, H., 2010. A review on steel thixoforming. Trans. Nonferrous Met. Soc. China 20, 1048-1054. 16) Roberts, G., Krauss, G., Kennedy, R., 1998a. Tool steels, 5th ed. ASM International, OH, United States, pp. 67-74. 17) Song, R., Kang, Y., Zhao, A., 2008. Semi-solid rolling process of steel strips. J. Mater. Process. Technol. 198, 291-299. 18) Spencer, D.B., Mehrabian, R., Flemings, M.C., 1972, Rheological behavior of Sn-15 Pct Pb in the crystallization range. Metall. Trans. 3, 1925-1932. 19) Uhlenhaut, D.I., Kradolfer, J., Püttgen, W., Löffler, J.F., Uggowitzer, P.J., 2006, Structure and properties of a hypoeutectic chromium steel processed in the semisolid state. Acta Mater. 54, 2727-2734. 20) Young, K.P., Kyonka, C.P., Courtois, J.A., 1983. Fine grained metal composition. US Patent 4,415,374.
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