Cryogenic reverse flow forming of AISI 304L

Cryogenic reverse flow forming of AISI 304L


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Abstract. Workpiece property-control permits the application-oriented and time-efficient production of components. In reverse flow forming, for example, a control of the microstructure profile is not yet part of the state of the art, in contrast to the geometry control. This is, due to several reasons, particularly challenging when forming seamless tubes made of metastable austenitic stainless AISI 304L steel. Inducing mechanical and/or thermal energy can cause a phase transformation from austenite to martensite within this steel. The resulting α’-martensite has different mechanical and micromagnetic properties, which can be advantageous depending on the application. For purposes of local property control, the resulting α’-martensite content should be measured and controlled online during the forming process. This paper presents results from the usage of a custom developed cryo-system and different application strategies to use liquid nitrogen as a coolant for local enhancement of the forming-temperature depending α’-martensite content.

Reverse Flow Forming, Cryo Forming, α’-Martensite, Closed-Loop Control

Published online 4/19/2023, 12 pages
Copyright © 2023 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: ARIAN Bahman, HOMBERG Werner, ROZO VASQUEZ Julian, WALTHER Frank, KERSTING Lukas, TRÄCHTLER Ansgar, Cryogenic reverse flow forming of AISI 304L, Materials Research Proceedings, Vol. 28, pp 2037-2048, 2023


The article was published as article 219 of the book Material Forming

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