In situ atomic force microscopy (AFM) study of pitting corrosion and corrosion under strain in a 304L stainless steel

Martin, Frantz; Cousty, J.; Masson, Julie; Bataillon, Christian

doi:10.1533/9781845692599.84

Cited by 4 publications

(6 citation statements)

References 14 publications

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“…Figure 1b shows slip bands forming at regular intervals, with differing directions in each grain either side of the GB; as each grain has a different crystallographic orientation. This phenomenon has been observed within other AFM studies of deformed austenitic stainless steels [35][36][37] . In some areas, the slip bands have two directions within a single grain, due to the activation of a second slip system, indicative of higher levels of strain, or a slip direction with a similar Schmid factor 35,37 .…”

Section: Measurements Of Individual Factors Leading To Sccsupporting

confidence: 83%

“…Type 304 stainless steel is austenitic and so has a face centred cubic (FCC) crystallographic structure which, when stressed, produces slip on the most closely packed {111} planes 35,36 . Figure 1b shows slip bands forming at regular intervals, with differing directions in each grain either side of the GB; as each grain has a different crystallographic orientation.…”

Section: Measurements Of Individual Factors Leading To Sccmentioning

confidence: 99%

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

et al. 2021

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Contact-mode high-speed atomic force microscopy (HS-AFM) has been utilised to measure in situ stress corrosion cracking (SCC) with nanometre resolution on AISI Type 304 stainless steel in an aggressive salt solution. SCC is an important failure mode in many metal systems but has a complicated mechanism that makes failure difficult to predict. Prior to the in situ experiments, the contributions of microstructure, environment and stress to SCC were independently studied using HS-AFM. During SCC measurements, uplift of grain boundaries before cracking was observed, indicating a subsurface contribution to the cracking mechanism. Focussed ion beam milling revealed a network of intergranular cracks below the surface lined with a thin oxide, indicating that the SCC process is dominated by local stress at oxide-weakened boundaries. Subsequent analysis by atom probe tomography of a crack tip showed a layered oxide composition at the surface of the crack walls. Oxide formation is posited to be mechanistically linked to grain boundary uplift. This study shows how in situ HS-AFM observations in combination with complementary techniques can give important insights into the mechanisms of SCC.

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Section: Measurements Of Individual Factors Leading To Sccsupporting

confidence: 83%

Section: Measurements Of Individual Factors Leading To Sccmentioning

confidence: 99%

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

et al. 2021

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“…Above a certain stress applied to the sample, more slip bands are activated in some grains due to the loading orientation ( Fig.7-b). This can be explained by the local stresses being high enough to release a new and more closely spaced slip bands [32]. Result of Fig.7-c corresponds to another grain which consist of parallel slip bands.…”

Section: Resultsmentioning

confidence: 93%

“…2 and 42 x27 2 in region A following 1000 and 10000 cycles are shown in Fig.6. AISI type 316 stainless steel has a Face Centre Cubic crystallographic structure [32], therefore the slip planes are {111} [32]. As shown in Figs.…”

Section: Resultsmentioning

confidence: 99%

Development of fatigue testing system for in-situ observation of stainless steel 316 by HS-AFM & SEM

Payam¹,

Payton²,

Picco

et al. 2019

International Journal of Fatigue

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A miniature three-point bend fatigue stage for in-situ observation of fatigue microcrack initiation and growth behaviour by scanning electron microscopy (SEM) and contact mode high-speed atomic force microscopy (HS-AFM) has been developed. Details of this stage are provided along with finite element simulations of the stress profiles of said stage and specimen on loading. The proposed stage facilitates study of the micro mechanisms of fatigue damage evolution when used during SEM and HS-AFM scanning of the sample surface. High amplitude low cycle fatigue tests have been carried out on annealed AISI Type 316 stainless steel to demonstrate the applicability of the system. Characteristic features of surface topography and evolution of slip bands observed have been documented. Images obtained by SEM and HS-AFM are presented for comparison. Finally, to demonstrate the capability of the new facility combined with HS-AFM, the spacing between slip bands and their height at different grains at the centre of the metal sample are measured and compared.

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“…Above a certain stress applied to the sample, more slip bands are activated in some grains due to the loading orientation. This can be explained by the local stresses being high enough to release a new and more closely spaced slip bands [19]. 5 shows the quantitative results of the measured grains for loading after 10000 cycles.…”

Section: Hs-afm Measurementmentioning

confidence: 99%

Development of Fatigue Testing System for in-situ Observation by AFM & SEM

et al. 2019

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A three-point bend fatigue miniature stage for in-situ observation of fatigue microcrack initiation and growth behaviour by scanning electron microscopy (SEM) and atomic force microscopy (AFM) has been manufactured. Details of the stage design with finite element analysis of the stress profiles on loading are provided. The proposed stage facilitates study of the micro mechanisms of fatigue when used during SEM and AFM scanning of the sample surface. To demonstrate the applicability of the system, fatigue tests have been performed on annealed AISI Type 316 stainless steel. Surface topography images obtained by SEM and HS-AFM (High Speed AFM) are presented for comparison. The data can be used to validate crystal plasticity models which should then directly predict multiaxial behaviour without recourse to deformation rules such as equivalent stress or strain.

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In situ atomic force microscopy (AFM) study of pitting corrosion and corrosion under strain in a 304L stainless steel

Cited by 4 publications

References 14 publications

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

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

Development of fatigue testing system for in-situ observation of stainless steel 316 by HS-AFM & SEM

Development of Fatigue Testing System for in-situ Observation by AFM & SEM

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