Ultrasonic detection of thermal embrittlement of duplex stainless steel
Creators
- 1. Non-Destructive Inspection Co., Ltd., Kyoto (Japan). Research Inst. of Safety and Diagnosis Technology
- 2. Non-Destructive Inspection Co., Ltd., Osaka (Japan). Div. of Planning for Power Plant Maintenance
- 3. Inst. of Nuclear Safety System, Inc., Kyoto (Japan). Inst. of Nuclear Technology
Description
Potential application of ultrasonic testing to characterize thermal aging embrittlement of duplex stainless steels was investigated. The materials to be tested were SUS329J1 and two simulated CF8M samples.The changes in acoustic properties such as attenuation and sound velocity were measured. In addition to ultrasonic testing, micro bend tests, micro-Vickers hardness tests for ferrite phase and austenite phase were performed also. Microstructural variation due to thermal aging was observed by high resolution FEG-TEM and in-situ micro element analysis was performed by STEM-EDS. The modulated microstructure and composition modulation in ferrite phase due to spinodal decomposition were observed. This modulation was confirmed by Moessbauer measurements, which showed the increase in the hyperfine field with aging time. The hyperfine field which was dependent on spinodal decomposition and was determined by Moessbauer measurement showed the linear correlation with micro-Vickers hardness in process of thermal aging. And the linear relationship between the changes in sound velocity and the changes in micro-Vickers hardness was obtained also. Consequently, it is suggested that the thermal aging embrittlement can be evaluated by measuring sound velocity in material. The mechanism of thermal aging embrittlement has been interpreted tentatively in terms of the decrease in dislocation mobility
Additional details
Publishing Information
- Publisher
- American Society of Mechanical Engineers.
- Imprint Place
- New York, NY (United States)
- ISBN
- 0-7918-1226-X
- Imprint Title
- ICONE-4: Proceedings. Volume 5: Radioactive waste disposal; Decontamination and decommissioning; Aging assessment and license renewals; Global advances in nuclear codes and standards; Major component reliability
- Imprint Pagination
- 525 p.
- Journal Page Range
- p. 215-223.
Conference
- Title
- ASME/JSME international conference on nuclear engineering.
- Acronym
- ICONE 4
- Dates
- 10-13 Mar 1996.
- Place
- New Orleans, LA (United States).
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 28001658
- Subject category
- S42: ENGINEERING; S36: MATERIALS SCIENCE; S22: GENERAL STUDIES OF NUCLEAR REACTORS;
- Resource subtype / Literary indicator
- Conference, Numerical Data
- Descriptors DEI
- AUSTENITIC STEELS; ELECTRON MICROSCOPY; EMBRITTLEMENT; EXPERIMENTAL DATA; MECHANICAL TESTS; MICROSTRUCTURE; MOESSBAUER EFFECT; NUCLEAR POWER PLANTS; REACTOR MATERIALS; ULTRASONIC TESTING
- Descriptors DEC
- ACOUSTIC TESTING; ALLOYS; CARBON ADDITIONS; CRYSTAL STRUCTURE; DATA; INFORMATION; IRON ALLOYS; IRON BASE ALLOYS; MATERIALS; MATERIALS TESTING; MICROSCOPY; NONDESTRUCTIVE TESTING; NUCLEAR FACILITIES; NUMERICAL DATA; POWER PLANTS; STEELS; TESTING; THERMAL POWER PLANTS; TRANSITION ELEMENT ALLOYS
Optional Information
- Secondary number(s)
- CONF-960306--.