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Observation of stress corrosion cracking using real-time in situ high-speed atomic force microscopy and correlative techniques

Engineering and Technology

Observation of stress corrosion cracking using real-time in situ high-speed atomic force microscopy and correlative techniques

S. Moore, R. Burrows, et al.

Discover groundbreaking insights into stress corrosion cracking (SCC) at the nanoscale. This research, conducted by S. Moore and colleagues, employs high-speed atomic force microscopy to unveil the subsurface mechanisms behind SCC in AISI Type 304 stainless steel, revealing intergranular cracks and layered oxide compositions.

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Playback language: English
Abstract
Contact-mode high-speed atomic force microscopy (HS-AFM) was used to measure in situ stress corrosion cracking (SCC) at the nanometer scale on AISI Type 304 stainless steel in a concentrated sodium thiosulfate solution. Prior to in situ experiments, the roles of microstructure, environment, and stress in SCC were independently studied. Grain boundary uplift was observed before cracking, suggesting a subsurface contribution. FIB milling revealed a network of intergranular cracks below the surface, lined with a thin oxide. APT analysis showed a layered oxide composition at the crack walls. The study demonstrates how in situ HS-AFM combined with other techniques provides insights into SCC mechanisms.
Publisher
npj Materials Degradation
Published On
Jan 18, 2021
Authors
S. Moore, R. Burrows, D. Kumar, M. B. Kloucek, A. D. Warren, P. E. J. Flewitt, L. Picco, O. D. Payton, T. L. Martin
Tags
stress corrosion cracking
high-speed atomic force microscopy
AISI Type 304 stainless steel
intergranular cracks
oxide composition
nanometer scale
sodium thiosulfate solution

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