Incremental Feeding High-Pressure Sliding for Grain Refinement of Large-Scale Sheets: Application to Inconel 718
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TION
IT is well known that the process using severe plastic deformation (SPD) is useful for significant grain refinement.[1,2] In particular, the SPD process under high pressure is applicable for hard and less ductile materials.
YOICHI TAKIZAWA is with the Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan, and with the WPI, International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka 819-0395, Japan, and also with the Technology Department, Nagano Forging Co., Ltd, Nagano 380-0003, Japan. Contact e-mail: [email protected] KOSEI SUMIKAWA and KYOHEI WATANABE are with the Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University. TAKAHIRO MASUDA and ZENJI HORITA are with the Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University, and also with the WPI, International Institute for Carbon-Neutral Energy Research (WPII2CNER), Kyushu University. MANABU YUMOTO, YUTA KANAI, and YOSHIHARU OTAGIRI are with the Technology Department, Nagano Forging Co., Ltd. Manuscript submitted August 27, 2017.
METALLURGICAL AND MATERIALS TRANSACTIONS A
The high-pressure torsion (HPT) is a typical SPD process that can be operated under high pressure[3–5] and it has been used for grain refinements of intermetallics,[6–12] semiconductors[13–18] and ceramics[19–24] including consolidation of metallic and ceramic powders.[25,26] Recently, the high-pressure sliding (HPS) was developed as an SPD process under high pressure as illustrated in Figure 1.[27] This HPS process is similar to the HPT process in the sense that it operates under high pressure but it is different because the sample for the HPS is used with a form of sheet[28,29] or rod[30] instead of disk or ring. While the total capacity was scaled up to 500 ton for vertical pressing and to 500 and 300 ton for the horizontal forward and backward pressings, respectively, the up-scaled HPS process was applied for grain refinement of high strength Al alloys (Al-Mg, A2024, and A7075),[28,29] a Mg alloy (AZ61),[28] a Ti alloy (ASTM F1295),[28,31] and a Ni-based superalloy (Inconel 718).[28,32] For all the alloys, sheet samples with dimensions of 10 to 30 mm width, 100 mm length and 1mm thickness were processed at room temperature and ultrafine grains with sizes of
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