Semi-Solid Forming Process of Austenitic Stainless Steel
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Accession number;05A0709859
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| Title;Semi-Solid Forming Process of Austenitic Stainless Steel |
| Author;
MIWA KENJI
(National Inst. Advanced Industrial Sci. and Technol., JPN)
KAWAMURA SATOSHI
(Ebara Res. Co., Ltd., JPN)
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Journal Title;Journal of Japan Foundry Engineering Society
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Journal Code:G0096A
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ISSN:1342-0429
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VOL.77;NO.8;PAGE.554-560(2005)
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| Figure&Table&Reference;FIG.12, REF.13 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;In order to develop the near net shaping process of austenitic stainless steels (UNS: s30400) by semi-solid extrusion forming process, microstructure controlling technology and forming technology of this material in the semi-solid state were investigated. Effects of forming temperature, forming rate, and forming pressure on the formability of its slurry into a metallic mold were studied. Rapid heating of the material before forming into the mold is needed to avoid coarsening of grains in the semi-solid state, but no homogeneous temperature distribution and homogeneous microstructure are obtained. In the case of rapid forming, the liquid phase is injected into the mold preferentially and segregation of the solid and liquid phases occurs. In the case of slow forming, such segregation does not occur, but good fulfillment is not obtained because of rapid cooling caused by sufficient contact with the metallic mold. When these parameters are optimized, defect-free formings are obtained, as are good surface products. By using a stainless steel wire net in place of a multi-hole die, high fluidity and homogeneous microstructures are obtained even at low forming rates. Two- or three-dimensional shape plates can also be formed by optimizing these parameters. (author abst.) |
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