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Special Section on Research Center Řež: Nuclear-Engineering Activities in 2018

Effect of the Surface Grinding on the Environmentally Assisted Crack Initiation of 316 L Steel in Simulated Pressurized Water Reactor Water

[+] Author and Article Information
Anna Hojna

Centrum Vyzkumu Rez s.r.o.,
UJV Group,
Rez 130,
Husinec 25068, Czech Republic
e-mail: anna.hojna@cvrez.cz

Mariia Zimina

Centrum Vyzkumu Rez s.r.o.,
UJV Group,
Rez 130,
Husinec 25068, Czech Republic
e-mail: mariia.zimina@cvrez.cz

Lucia Rozumova

Centrum Vyzkumu Rez s.r.o.,
UJV Group,
Rez 130,
Husinec 25068, Czech Republic
e-mail: lucia.rozumova@cvrez.cz

Manuscript received February 7, 2019; final manuscript received February 26, 2019; published online April 16, 2019. Assoc. Editor: Martin Schulc.

ASME J of Nuclear Rad Sci 5(3), 030909 (May 10, 2019) (11 pages) Paper No: NERS-19-1017; doi: 10.1115/1.4043099 History: Received February 07, 2019; Revised February 26, 2019

This paper presents results on the effect of a surface treatment on the environmentally assisted corrosion cracking in a pressurized water reactor chemistry. Slow strain rate testing of 316 L austenitic steel with selected rates was performed at pressurized water reactor (PWR) simulated water at 350 °C and in air at 300 °C. Detailed prior and post-testing characterization of two types of surfaces including roughness, hardness, and microstructural analysis was made. Transgranular cleavage-like environmentally assisted cracking (EAC) initiation and growth were observed under PWR conditions. The effect of two surface finishes on the cracking initiation was observed: (i) first crack initiates from the polished surface in a vicinity of the necking area rather than from the ground surface and (ii) then the deeper crack develops in the minimal diameter from the polished surface side than from the ground one.

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References

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Figures

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Fig. 1

Tapered tensile test specimen

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Fig. 2

Polished and ground surface images in SE mode. Indents are made on both surfaces of tapered specimens for the simplification of distance measurements.

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Fig. 3

Nanohardness versus distance from the polished/ground surface

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Fig. 4

BSE images of cross section close to (a) polished and (b) ground sides of the sample

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Fig. 5

Stress–displacement curves of CERTs of the 316 L tapered specimens in air at 300 °C (dotted line) and PWR water (double, triple, and full lines) at 350 °C. Data refer to a loading at minimal diameter.

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Fig. 6

Crack appearance on the specimen LW1 loaded in PWR water up to rupture: ground surface in a distance from fracture: (a) 1 mm and (b) detail of (a) showing cleavage-like fracture; (c) 3.8 mm and (d) detail of (c) showing step-like features; and (e) the deepest crack initiating at minimal diameter

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Fig. 7

Crack appearance on the specimen LW1 loaded in PWR water up to rupture: polished surface in a distance from fracture: (a) 0.1 mm showing open cracks of cleavage-like features transferring to ductile when grown deeper; (b) 1.5 mm; (c) 5.4 mm and (d) 8.7 mm, showing single or multiple cracks of step-like features and fine cracks in oxide; and (e) the deepest crack initiating at minimal diameter

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Fig. 8

Crack appearance at the specimen LW2 loaded in PWR water up to maximum load: ground surface: (a) crack field in minimal diameter; (b) detail of a cleavage-like crack and (c) the deepest crack. Last crack appearances at (d) 24.1 mm. (e) The crack depth at 3.6 mm from the minimal diameter.

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Fig. 9

Crack appearance at the specimen LW2 loaded in PWR water up to maximum load: polished surface (a) crack field in minimal diameter; (b) detail of a cleavage-like crack and (c) the deepest crack. Last crack appearance at (d) 19 mm. (e) The crack depth at 5.8 mm from the minimal diameter.

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Fig. 10

SE and BSE crack appearance at the specimen LW9 loaded in PWR water above yielding point: ground surface (a) crack field in minimal diameter; (b) detail of a cleavage-like crack and (c) the deepest cracks in the thin oxide layer. (d) Last crack appearance at 15.5 mm.

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Fig. 11

SE and BSE micrographs. Crack appearance at the specimen LW9 loaded in PWR water above yielding point: polished surface in minimal diameter (a) cracks initiating along remaining machining grooves mixing with perpendicular EAC cracks and (b) the deepest crack. (c) Last crack appearance at 5.1 mm.

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