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51313-02411-SCC in PWR Water of Alloy 690 and Its Weld Metals

Product Number: 51313-02411-SG
ISBN: 02411 2013 CP
Author: Peter Andresen
Publication Date: 2013
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SCC growth rate testing of Alloy 690 base metal HAZ and weld metal has been performed in representative PWR primary water at 290 to 360 C. Intergranular crack growth rates as high as 1.2 x 10–6 mm/s were observed in the S-L orientation with microstructural banded material after cold rolling or forging to align the planes of banding rolling and cracking. Growth rates on homogeneous Alloy 690 including extruded CRDM tubing often approached 10–7 mm/s in cold worked condition and an S-L orientation. Much lower growth rates in some Alloy 690 tests were observed primarily in orientations other than S-L. Alloy 152/52/52i weld metals always exhibited low growth rates apart from a weld that was further cold worked by 20%. Crack growth rates along a carbon steel - 152M interface were very high at ~2 x 10-7 mm/s.
 

SCC growth rate testing of Alloy 690 base metal HAZ and weld metal has been performed in representative PWR primary water at 290 to 360 C. Intergranular crack growth rates as high as 1.2 x 10–6 mm/s were observed in the S-L orientation with microstructural banded material after cold rolling or forging to align the planes of banding rolling and cracking. Growth rates on homogeneous Alloy 690 including extruded CRDM tubing often approached 10–7 mm/s in cold worked condition and an S-L orientation. Much lower growth rates in some Alloy 690 tests were observed primarily in orientations other than S-L. Alloy 152/52/52i weld metals always exhibited low growth rates apart from a weld that was further cold worked by 20%. Crack growth rates along a carbon steel - 152M interface were very high at ~2 x 10-7 mm/s.
 

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