Microstructural Evolution of Austenitic Stainless Steel AISI304 and AISI316 Subjected to High-Temperature Thermal Aging

Abstract:

The purpose of this study is to investigate the microstructural evolution of austenitic stainless steels AISI304 and AISI316 subjected to thermal aging at elevated temperature. Most structural steels are generally subjected to softening of matrix when they are exposed to high temperatures for a long period of time because of the coarsening of the secondary phases and the phase transformation. The test specimens are heat-treated in electrical furnace for up to 5000 h at each predetermined aging time to simulate the degraded microstructure under high temperature. The microstructural changes in test materials have been evaluated by the optical and electron microscope in relation with twins, grains, precipitates, and phase transformation. The mechanical hardening were also discussed in terms of microstructural changes during long-term aging.

• Periodical: Materials Science Forum (Volume 857)
• Pages: 276-280
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.857.276
• Online since: May 2016
• Authors: Hak Min Lee, Chung Seok Kim*
• Keywords: AISI304, AISI316, Microstructure, Stainless Steel, Thermal Aging

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