Grain refinement processes for superplastic forming of AISI 304 and 304L austenitic stainless steels

Y. YagodzinskyyLaboratory of Engineering Materials Helsinki University of Technology, PO Box 4200, FIN – 02015 HUT, Finland

J. PimenoffLaboratory of Engineering Materials Helsinki University of Technology, PO Box 4200, FIN – 02015 HUT, Finland

O. TarasenkoLaboratory of Engineering Materials Helsinki University of Technology, PO Box 4200, FIN – 02015 HUT, Finland

J. RomuLaboratory of Engineering Materials Helsinki University of Technology, PO Box 4200, FIN – 02015 HUT, Finland

P. NenonenVTT Manufacturing Technology PO Box 1704, FIN – 02044 VTT, Finland.

H. HänninenLaboratory of Engineering Materials Helsinki University of Technology, PO Box 4200, FIN – 02015 HUT, Finland

Abstract

Elongation to fracture values higher than 300% were obtained for cold rolled AISI 304 type steel grades in hot tensile tests. The effects of heating rate and carbon content on the elongation of the steels studied are discussed based on internal friction measurements and TEM observations. A slow heating rate to the test temperature and high carbon content of the steel led to a fine and equiaxial grain structure of the steels.

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Grain refinement processes for superplastic forming of AISI 304 and 304L austenitic stainless steels

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Grain refinement processes for superplastic forming of AISI 304 and 304L austenitic stainless steels

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