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08600 SCC Crack Growth in 316L Weld Metals in BWR Environments

Picture for 08600 SCC Crack Growth in 316L Weld Metals in BWR Environments
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Product Number: 51300-08600-SG
ISBN: 08600 2008 CP
Author: R. G. Ballinger, J. H. Kim, and P. W. Stahle
Publication Date: 2008
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The thermal aging and consequent embrittlement of materials are ongoing issues in cast and duplex stainless steel. Spinodal decomposition is largely responsible for the well known “475°C” embrittlement that results in drastic reductions in ductility and toughness in cast materials. This process is also operative in welds in either cast or wrought stainless steels where delta ferrite is present. While the embrittlement can occur after several hundred hours of aging at 475°C, it can also occur at lower temperatures where ductility reductions have been observed after several tens of thousands of hours at 300°C. The effect of thermal aging on mechanical properties, including tensile, toughness, fatigue and static crack growth has been investigated at room temperature and in 288°C high purity water simulating BWR operating conditions.
The thermal aging and consequent embrittlement of materials are ongoing issues in cast and duplex stainless steel. Spinodal decomposition is largely responsible for the well known “475°C” embrittlement that results in drastic reductions in ductility and toughness in cast materials. This process is also operative in welds in either cast or wrought stainless steels where delta ferrite is present. While the embrittlement can occur after several hundred hours of aging at 475°C, it can also occur at lower temperatures where ductility reductions have been observed after several tens of thousands of hours at 300°C. The effect of thermal aging on mechanical properties, including tensile, toughness, fatigue and static crack growth has been investigated at room temperature and in 288°C high purity water simulating BWR operating conditions.
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