Simulation of Ductility Dip Cracking Susceptibility on Ni-based Alloy in Varestraint Test
Alloy 690 is a Ni-Cr-Fe type alloy with a widespread application in nuclear power plants. However, the companion filler metal 52M (FM-52M) is susceptible to ductility-dip cracking (DDC), which seriously affects safety and life extension in nuclear application. To provide a better understanding of DDC formation in varestraint test, local strain is adopted to assess materials resistance of DDC instead of average bending strain. In this work, spot-varestraint tests of FM-52M were performed with an average strain (0.25％ - 7％). Then a thermo-mechanical simulation of spot-varestraint test was modeled based on the experiment. The simulation obtained accumulated strain increment during susceptible temperature range. Simulated local strain caused at elevated temperature is much larger than average strain. Besides, prediction of DDC distribution agrees well with experiment results. The FEM model presents a clear local strain distribution and provides an extra understanding of DDC formation.
Varestraint test ductility-dip cracking finite element method Ni-based alloys
J.Q. Chen C. Yu J.M. Chen H. Lu M.L. Zhang
School of materials science and engineering, Shanghai Jiao Tong University, Shanghai, 200240, PR Chi Shanghai Electric Nuclear Power Equipment Co. Ltd., Shanghai, 201306, PR China
国际会议
济南
英文
1-6
2012-08-24（万方平台首次上网日期，不代表论文的发表时间）