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Open AccessArticle

Development of a Stainless Austenitic Nitrogen-Alloyed CrMnNiMo Spring Steel

Institute of Iron and Steel Technology, TU Bergakademie Freiberg (TU BAF), 09599 Freiberg, Germany
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Crystals 2019, 9(9), 456; https://doi.org/10.3390/cryst9090456
Received: 24 July 2019 / Revised: 22 August 2019 / Accepted: 27 August 2019 / Published: 31 August 2019
(This article belongs to the Special Issue Mechanical Behaviour of Austenitic Stainless Steels)
The generation of a nickel-reduced, stainless spring steel strip with a thickness of 0.2 mm, producible under industrial conditions, is the aim of a transfer project together with the Institute of Metal Forming/TU BAF and the Auerhammer Metallwerk GmbH within the DFG Collaborative Research Centre (CRC) 799. The spring steel strip should exhibit a tensile strength of ≥1700 MPa in work-hardened and partitioned state. The mechanical and corrosive properties of the steel strip should be equal or better than those given for 1.4310 steel (AISI 301). The article presents the results of laboratory alloys focused on the design of steel strips, which meet the requirements for a cost-effective production. The results presented relate to steel design, microstructure formation, temperature-dependent mechanical properties, and corrosion resistance. Four alloys of the type X5CrMnNiMoN16-x-4 with manganese contents of approximately 2 to 6 wt.-percent were investigated. The austenitic steel X5CrMnNiMoN16-4-4 with TRIP/TWIP effect was selected for deformation and partitioning treatments. Its deformation-induced α’-martensite formation significantly contributes to the work hardening of the steel. A short-time annealing treatment (partitioning) further increases the strength properties. View Full-Text
Keywords: stainless austenitic spring steel; CrMnNi-steel; deformation-induced α′-martensite; TRIP/TWIP effect; deformation and partitioning treatment; passivation; corrosion resistance; pitting corrosion stainless austenitic spring steel; CrMnNi-steel; deformation-induced α′-martensite; TRIP/TWIP effect; deformation and partitioning treatment; passivation; corrosion resistance; pitting corrosion
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Schröder, C.; Wendler, M.; Kreschel, T.; Volkova, O.; Weiß, A. Development of a Stainless Austenitic Nitrogen-Alloyed CrMnNiMo Spring Steel. Crystals 2019, 9, 456.

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