Abstract
At the present time, many Extra Super Critical Pressure Boiler are made by 9%Cr steel for thermal power station in Japan. these power station have been in operation for a total of over 100,000 hours, Actual-Size Burst Equipment capable of reproducing actual equipment damage (Type IV damage)and FEM are used to solve this burst mechanism. Worlds first time, Residual Life Assessment Method from middle Life able to use Welding part at 9%Cr steels was developed. Type IV mechanism for 9%Cr Welding Part was solved. We tried to search Burst Extend of Multi Axis (εf) from each Company Test Date. In the result, It was about all same value 1.16. Steady strain rate (εmin) is measured by Laser Device that consist of usual setting target and main body setting at Periodic Inspection. Heat Influence for HAZ in TIG Welding of Laser Device Fitting Set was little, 1mm depth. We confirmed accuracy of this method using Mono Axis Test Piece, In the result, Burst Time expected by this one is 4926hours, Real Burst time is 5000 hours, Its accuracy is Factor of 1.015. In conclusion, We developed high accuracy Residual Life Diagnosis Method in the worlds first, It is consisted of combination Strain considered Multi Axis Burst Extend and Micro structure in 9%Cr steel HAZ
