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Low Temperature Sheet Forming,

Autoren:Voges-Schwieger, K; Hübner, S.;Behrens, B.-A.
Kategorie:Zeitschriften/Aufsätze (reviewed)
Jahr:2011
Veröffentlichung:The 14th International ESAFORM Conference on Material Forming, Queen’s University Belfast, Northern Ireland - United Kingdom, April 27-29, 2011, AIP Conf. Proc. 1353, pp. 224-228, American Institute of Physics 978-0-7354-0911-8.
DOI:10.1063/1.3589519

Abstract

Metastable austenitic stainless steels change their lattice during forming operations by strain‐induced alpha’‐martensite formation. Temperatures below T=20° C can accelerate the phase transformation while temperatures above T=60° C may suppress the formation of martensite during the forming operation. In past investigations, the effect of high‐strength martensitic regions in an austenitic ductile lattice was used in crash relevant parts for transportation vehicles. The local martensitic regions act as reinforcements leading to an increase in crash energy absorption. Moreover, they control the folding behavior as well as the force‐distance‐characteristic and increase the buckling resistance. This paper deals with a concerted thermomechanical drawing process to increase the local formation of alpha’‐martensite caused by low temperatures.