NDLI: Mechanical and Microstructural Characterization of Heat-Affected Zone Materials of Reactor Pressure Vessel

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Katsuyama, Jinya Tobita, Tohru Nishiyama, Yutaka Onizawa, Kunio
Copyright Year	2010
Abstract	In order to monitor the neutron irradiation embrittlement of the reactor pressure vessel (RPV) steels for the safe operation of light-water reactors, surveillance specimens of representative materials, i.e. base metal, weld metal and heat affected zone (HAZ), are installed in the RPV during reactor operation according to the regulation. Among these materials, HAZ specimens exhibit a relatively large scatter in Charpy impact properties because of the microstructural inhomogeneity due to multi-pass welding. ASTM E185 and JSME S NC1 stipulate the exception of HAZ specimens from surveillance test. However, the technical basis on the exception has not been established. Therefore, we have started a research on the irradiation embrittlement in HAZ material of RPV steels. Typical RPV steel plates with different impurity levels and their weldments were fabricated to characterize the microstructures and subsequent mechanical properties of typical HAZ materials. Simulated HAZ materials were also made by applying several heat treatments representative of HAZ. Finite element analysis was conducted to draw maps of distributions of grain size and phase-fraction. Using simulated HAZ materials with different grain size and phase before irradiation, mechanical properties such as hardness, Charpy impact property and fracture toughness were measured in comparison with those of base metals and actual HAZ materials. Through the comparison, it was indicated that mechanical properties such as fracture toughness in some simulated HAZ materials were different from base metal and dependent significantly on the metallurgical structure, particularly phase but prior austenitic grain size. Higher fracture toughness in CGHAZ (Coarse-Grain HAZ) materials compared to base metal is due to mixed structure of martensite and lower-bainite phases. Upper-bainite phase in FGHAZ (Fine-Grain HAZ) and base materials causes lower fracture toughness than CGHAZ materials.
Sponsorship	Pressure Vessels and Piping Division
Starting Page	585
Ending Page	592
Page Count	8
File Format	PDF
ISBN	9780791849200
DOI	10.1115/PVP2010-25561
e-ISBN	9780791838785
Volume Number	ASME 2010 Pressure Vessels and Piping Conference: Volume 1
Conference Proceedings	ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference
Language	English
Publisher Date	2010-07-18
Publisher Place	Bellevue, Washington, USA
Access Restriction	Subscribed
Subject Keyword	Grain size Reactor vessels Japan society of mechanical engineers Welding Irradiation (radiation exposure) Metals Embrittlement Mechanical properties Light water reactors Neutrons Steel Fracture toughness Base metals Astm international Heat Surveillance Electromagnetic scattering Plates (structures) Finite element analysis
Content Type	Text
Resource Type	Article

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