Effect of Thermal Aging on Material Strength and Fracture Behavior in Mod.9Cr-1Mo Steel
- 1. Korea Atomic Energy Research Institute, Daejeon (Korea, Republic of)
- 2. Sungkyunkwan University, Seoul (Korea, Republic of)
Description
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.
Additional details
Publishing Information
- Journal Title
- Transactions of the Korean Society of Mechanical Engineers. C
- Journal Volume
- 4
- Journal Issue
- 2
- Series
- 11 refs, 13 figs, 1 tab
- Journal Page Range
- p. 101-109
- ISSN
- 2288-3991
INIS
- Country of Publication
- Korea, Republic of
- Country of Input or Organization
- Korea, Republic of
- INIS RN
- 50081286
- Subject category
- S42: ENGINEERING;
- Descriptors DEI
- AGING; HEAT RESISTANT MATERIALS; NUCLEAR ENERGY; PIPES; R CODES; TENSILE PROPERTIES; YIELD STRENGTH
- Descriptors DEC
- COMPUTER CODES; ENERGY; MATERIALS; MECHANICAL PROPERTIES; TUBES