Forming limits of austenitic stainless steel sheets

• Autorzy: Korhonen, A. , Manninen, T. , Kanervo, K.

Warianty tytułu

PL

Odkształcalność blach ze stali austenitycznej odpornej na korozję

• Języki publikacji: EN

Abstrakty

EN

The forming limits of austenitic stainless steel sheets were studied. It was found that the observed limit of straining in stretch forming, when both of the principal stresses are positive, is not set by localized necking, but instead by shearing fracture in the through thickness direction. Thus, the Marciniak-Kuczynski type of analysis, which has recently been successfully applied to both low-carbon steels and aluminum, may not apply to austenitic stainless steels. It appears that the forming limits of austenitic stainless steels may be predicted fairly well by using the classical localized and diffuse necking criteria developed by Hill. The fracture criterion of Ritchie and Thompson seems to overestimate the fracture limit. Better models are needed for the work hardening and to develop better limit strain criteria, since the work hardening seems to depend strongly on both strain rate and temperature. The formability of austenitic stainless steels appears to remain good even when coated with hard TiN, although unavoidable cracks will appear with continuing straining.

PL

Przedmiotem pracy jest odkształcalność graniczna stali austenitycznych. Zaobserwowano, że odkształcalność przy dwuosiowym rozciąganiu, gdy dwa naprężenia główne są dodatnie, nie jest wyznaczana przez lokalne tworzenie się szyjki, ale przez pękanie wywołane przez ścinanie w kierunku grubości blachy. Dlatego metoda Marciniaka-Kuczynskiego, która jest z powodzeniem stosowana do stali nisko-węglowych i aluminium, może nie stosować się do stali austenitycznych. Okazuje się, że odkształcenia graniczne stali austenitycznych mogą być poprawnie przewidywane przez zastosowanie opracowanego przez Hilla klasycznego kryterium lokalizacji i rozprzestrzeniania się szyjki. Kryterium pękania Ritchie-Thompsona wydaje się przeszacowywać granicę pękania. Ponieważ umocnienie zależy mocno od prędkości odkształcenia i temperatury, lepsze modele są potrzebne do opisu umocnienia i opracowania poprawnego kryterium granicznych odkształceń. Odkształcalność graniczna stali austenitycznej utrzymuje się na dobrym poziomie nawet wtedy, gdy stal jest pokryta TiN, chociaż nieuniknione pęknięcia pojawią się w czasie odkształcenia.

Słowa kluczowe

EN

sheet metal forming; forming limit diagram; austenitic stainless steels; necking; fracture

• Czasopismo: Computer Methods in Materials Science
• Rocznik: 2006
• Tom: Vol. 6, No. 3-4
• Strony: 178-187
• Opis fizyczny: Bibliogr. 52 poz., rys.

Twórcy

autor

Korhonen, A.

autor

Manninen, T.

autor

Kanervo, K.

• Helsinki University of Technology, P.O. Box 6200, 02015 HUT, Finland,

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