PLASTIC WORKING METHOD AND PLASTIC WORKING DEVICE FOR METAL MATERIAL

WIPO Patent Application WO/2013/171884

A1

The present invention is a plastic working method for austenite-containing steel material wherein: a site at which fracture during plastic deformation of the steel material is predicted is specified; the strain ratio βx of said predicted fracture site is analyzed; the steel material is heated so that the local temperature Tlocal satisfies Formula (1); and the post-heating steel material is plastically deformed. Tβx is the maximum strain induced transformation ductility temperature with respect to the strain ratio βx in °C units, σLβx is the standard deviation of the strain ratio βx-dependent equivalent critical strain approximation curve that is on the low temperature side of Tβx, σHβx is the standard deviation of the strain ratio βx-dependent equivalent critical strain approximation curve that is on the high temperature side of Tβx, and Tlocal is the local temperature at the predicted fracture site in °C units. Tβx-2×σLβx ≤ Tlocal ≤ Tβx+1.25×σHβx (Formula 1)

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SATO KOICHI (JP)
KUBO MASAHIRO (JP)
MIZUMURA MASAAKI (JP)
YOSHIDA TOHRU (JP)

PCT/JP2012/062691

November 21, 2013

May 17, 2012

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NIPPON STEEL & SUMITOMO METAL CORP (JP)
SATO KOICHI (JP)
KUBO MASAHIRO (JP)
MIZUMURA MASAAKI (JP)
YOSHIDA TOHRU (JP)

B21D22/20

WO1995029268A1	1995-11-02
WO2012067160A1	2012-05-24

JP2009136880A	2009-06-25
JP2004330230A	2004-11-25
JP2005177805A	2005-07-07
JP2007111765A	2007-05-10
JP2004190050A	2004-07-08

See also references of EP 2851139A4

SHIGA Masatake et al. (JP)
Masatake Shiga (JP)

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