INFLUENCE OF HEAT TREATMENT ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF SUS 316L ALLOY

1 Drápala Jaromír
Co-authors:
1 Kostiuková Gabriela 1 Losertová Monika
Institution:
1 VSB - Technical University of Ostrava, Ostrava, Czech Republic, EU, Jaromir.Drapala@vsb.cz
Conference:
27th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 23rd - 25th 2018
Proceedings:
Proceedings 27th International Conference on Metallurgy and Materials
Pages:
1527-1532
ISBN:
978-80-87294-84-0
ISSN:
2694-9296
Published:
24th October 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
9 views / 2 downloads
Abstract

Grade 316L is the low carbon austenitic stainless steel with molybdenum content and is immune from sensitisation (grain boundary carbide precipitation). Thus it is extensively used in heavy gauge welded components. The austenitic structure also gives excellent toughness, even down to cryogenic temperatures. The molybdenum gives 316L good overall corrosion resistant properties, particularly higher resistance to pitting and crevice corrosion in chloride environments. Compared to chromium-nickel austenitic stainless steels, 316L stainless steel offers higher creep, stress to rupture and tensile strength at elevated temperatures. These properties are specified for flat rolled product (plate, sheet, pipe, bar and coil) in ASTM A240/A240M.Thermal treatment of SUS 316L alloys allows significantly influence microstructure and mechanical properties. The aim of this work was the study of microstructure of SUS 316L before and after annealing. The heat regimes were performed at these conditions: 1050, 1100 and 1150 °C for 20 minutes followed by slow cooling in vacuum. Microstructures features were studied by means of optical and scanning electron microscopies, EDX microanalysis and microhardness measurement. Higher aging temperatures and annealing time led to decreasing microhardness and microstructure changes (grain growth).

Keywords: Alloy SUS 316L, heat treatment, microstructure, EDX analysis, microhardness
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