|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Materials and Fuels for the Current and Advanced Nuclear Reactors V
||Effect of Cold Rolling on the Integrity and SCC Susceptibility of Twin Boundaries of Alloy 690
||Wenjun Kuang, Cody Miller, Mike Kaufman, Talukdar Aman, Bharat Gwalani, Rajarshi Banerjee, Gary Was
|On-Site Speaker (Planned)
Nickel base alloy 690 is a highly twined material that has been widely used in nuclear power plant components. The aim of this work is to determine the effect of cold rolling on twin boundaries and their SCC susceptibility. Electron back scatter diffraction showed that cold rolling to 20% caused the rotation angle of twins to deviate from 60° and the twin planes to be misaligned. After aging at 475 °C, carbides formed on both random high angle boundaries (RHAB) and twins transformed by cold rolling, while they only formed on RHABs in non-cold rolled samples. The SCC results from slow strain rate tensile tests in 360°C hydrogenated water indicate the transformed twins accounted for more than 10% of the crack length in cold-rolled samples while twins rarely cracked in non-cold rolled samples. It is concluded that cold rolling altered the twin boundary structure and decreased its SCC resistance significantly.
||Planned: A print-only volume