Effects of electropulsing on the microstructure evolution of 316L stainless steel

Lu, Wen Jun and Qin, Rong Shan (2014). Effects of electropulsing on the microstructure evolution of 316L stainless steel. Advanced Materials Research, 922 pp. 441–445.

DOI: https://doi.org/10.4028/www.scientific.net/AMR.922.441

Abstract

Thermal crack initiation and pitting corrosion are frequently caused by the formation of the secondary phases such as sigma phase, delta-ferrite phase, carbides and secondary austenite phase in steel. Traditionally, heat treatment is used to minimize these detrimental effects of the secondary phases. In this study, we have applied pulse to the 316L stainless steel and observed the considerable effects. In comparison to the heat treatment, the electropulsing can effectively suppress the precipitation of the secondary phases in a temperature range (1161 K–1173 K). Austenite grain size becomes larger under electropulsing compared to the heat treatment at annealing temperatures due to enhanced interface migration. The kinetic and thermodynamic aspects of electropulsing can be used to explain the effects of electropulsing on the evolution of microstructure for 316L stainless steel.

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