In a 21-2n deformed stainless steel influence of recovery temperature

• Published in: Journal of physics. Conference series 2017-01, Vol.792 (1), p.12017
• Main Authors: De Ita, A, Ugalde, P, Flores, D
• Format: Article
• Language: English
• Subjects: Austenitic stainless steels; Automotive parts; Chemical precipitation; Chromium; Corrosion resistance; Deformation; Hardness; Heat treatment; Hot rolling; Mechanical properties; Physics; Precipitates; Residual stress; Stainless steel
• ISSN: 1742-6588; 1742-6596
• DOI: 10.1088/1742-6596/792/1/012017

We present the influence high heat treatment temperature of a nitrogen austenitic stainless steel, deform by cold compression, in 10 different percentages. The steel contains high chromium (19.25 %), nickel (1.5 %) and nitrogen (0.2 %). The typical applications for this alloy are automobile parts and special valves for his excellent mechanical properties and corrosion resistance. Produced by hot rolling, they were subjected homogenized treatment at 975 °C for 45 minutes. Subsequently, deformed, by cold compression. We get ten different deformations, from 3 % to 22 %. These samples then to a heat treatment at 750 °C for one, 2 and 4 hours respectively. To observe the microstructure all samples were metallographic study and measured also their Rockwell C hardness. The initial sample has an austenitic matrix with a small amount of precipitates with a 42 RC average hardness. The homogenized sample had a 39 RC hardness. The deformed samples increased their hardness with a maximum of 49 RC. The samples with the treatment, showed a lower hardness with longer time with high dispersion. The decreased of hardness is due to the elimination of residual stresses and precipitates increasing size.