Abstract
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.
Highlights
The European standard EN 10151 contains stainless spring steel strips, their treatment and properties [1]
The austenitic steel X5CrMnNiMoN16-4-4 with TRIP/TWIP effect was selected for deformation and partitioning treatments
They are the raised compared to steel
Summary
The European standard EN 10151 contains stainless spring steel strips, their treatment and properties [1]. These spring steels are relatively unstable austenitic steels with Ms α -temperatures near and below room temperature (RT). The required high-strength properties are achieved by a mainly martensitic microstructure, which is created by appropriate cold forming and subsequent tempering. The strain-hardened and tempered martensitic structure guarantees the required high-strength properties. Stainless spring steels are classified as corrosion-resistant steels due to their chromium content of more than 12%. Additives of molybdenum and nitrogen improve the corrosion properties and increase the resistance to pitting corrosion [5]
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