Crystal Orientation Analysis on Stress Corrosion Cracking Facets in Austenitic Stainless Steels

Abstract:

Quasi-cleavage facets have been detected in the stress corrosion cracking fracture of type 304 and type 316 austenitic stainless steels under an environment containing chloride. Their morphology and crystal orientation were analyzed. In both steels the cold-worked material (CW) showed higher crack propagation rate than annealed one (ST), where the variation of the propagated crystal planes of the CW was higher than that of the ST, and the {111} facet was detected in the CW. Then the CW reveals higher possibilities to choose a low energy crack path rather than the ST. The rearrangement and multiply of {111} dislocation arrays may introduce the {111} transgranular cracking in the CW, and the combining duplex {111} slip operations may result in the {110} facet.

• Periodical: Key Engineering Materials (Volume 810)
• Pages: 64-69
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.810.64
• Online since: July 2019
• Authors: Ryo Wakinaga, Norimitsu Koga, Osamu Umezawa*, Motoaki Morita, Shinichi Motoda, Tadashi Shinohara
• Keywords: Austenitic Stainless Steel, Cold-Work, Corrosion Pitting, Electron Backscattering Diffraction, Quasi-Cleavage Fracture, Stress Corrosion Cracking, Transgranular Cracking

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