Download presentation
Presentation is loading. Please wait.
Published byDaisy Sims Modified over 9 years ago
1
Chloride-Induced Stress Corrosion Cracking of Austenitic Stainless Steel David Spencer 3rd Year PhD Student Nuclear Department
2
Area of Concern Submarine PWR Primary Circuit Austenitic Stainless Steel – 304L Chloride Ions – Cl - Tensile Stress – Applied or Residual
3
Crack Propagation Crack propagating along metallic grain boundaries Metallic Grains Grains Crack propagating across grains Transgranular Intergranular
4
Initial Development Previous finite element study had shown that anomalous crack propagation occurred at prior plastic strains of around 5% New atmospheric test developed to emulate chloride contamination on the exterior of primary circuit Conditions under which severe transgranular SCC occurred established Full factorial study planned to distinguish between the interacting factors controlling crack propagation rates.
5
Bent Beam Test
6
Test Configuration
7
2.5 Days 180MPa 3% Strain
9
Initiation at Pitting
10
Shallow Crack Propagation
11
Typical Crack Front Crack tip propagating to within 0.2mm of the far side of the specimen
14
Factorial Investigation InputsLevels Stress60 MPa120MPa Strain0%0.5%1%2%5% Temp60ºC75ºC90ºC Humidity30%70%
17
FIB Milled Section of Crack Tip
18
Any Questions? thanks to: Dr Ian Giles Dr Paul Chard-Tuckey Dr Mike Edwards
19
Corrosion Enhanced Plasticity Model The corrosion enhanced plasticity model Magnin et al.(1996)
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.