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http://dx.doi.org/10.3795/KSME-C.2016.4.2.101

Effect of Thermal Aging on Material Strength and Fracture Behavior in Mod.9Cr-1Mo Steel  

Lee, Hyeong-Yeon (Korea Atomic Energy Research Institute)
Kim, Woo-Gon (Korea Atomic Energy Research Institute)
Son, Seok-Kwon (Korea Atomic Energy Research Institute)
Hong, Suk Woo (Sungkyunkwan University)
Seok, Chang Sung (Sungkyunkwan University)
Publication Information
Transactions of the KSME C: Technology and Education / v.4, no.2, 2016 , pp. 101-109 More about this Journal
Abstract
The material properties of heat resistant materials at power plants are affected by thermal aging as operating time is accumulated. In this study, the influence of thermal aging on yield strength, tensile strength and fracture behavior for Mod.9Cr-1Mo (ASME Grade 91) steel which is a material widely adopted for Generation IV nuclear energy system has been investigated and analyzed. Service exposed Gr.91 steel materials sampled from a piping system of an ultra-supercritical (USC) plant in Korea with accumulated operation time of 73,716 hours were used for material testing. The test results of the service exposed material specimens were compared with those of the virgin Gr.91 steel specimens. Those test data were compared with the material properties of ASME code and RCC-MRx code. Conservatisms of the material properties in the design codes have been quantified based on the comparisons of those from virgin and service exposed material specimens.
Keywords
Thermal Aging; Material Strength; Generation IV Nuclear Energy System; Fracture; J-R Curve;
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