Materials and Fabrication

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

[+] Author and Article Information
Jinya Katsuyama, Tohru Tobita, Yutaka Nishiyama, Kunio Onizawa

Nuclear Safety Research Center, Japan Atomic Energy Agency, 2-4 Shirakata-shirane, Tokai-mura, Naka-gun, Ibaraki 319-1195 Japan

J. Pressure Vessel Technol 134(3), 031402 (May 18, 2012) (7 pages) doi:10.1115/1.4005868 History: Received October 06, 2010; Revised November 11, 2011; Published May 17, 2012; Online May 18, 2012

In order to provide the technical basis for the judgment of the needs of surveillance specimens of heat-affected zone (HAZ) in reactor pressure vessel (RPV) steels, we performed a research on the characterization of metallurgical and mechanical properties of the HAZ in RPV steels. The distributions of grain size and phases were drawn as a map based on temperature histories around HAZ obtained from welding simulation. Referring to the HAZ map, typical HAZ materials were made by simulating temperature histories including postweld heat treatment (PWHT) within the HAZ. Metallurgical and mechanical characteristics for those HAZ materials were compared with those of base metal. From the results, it is clear that mechanical properties of HAZ materials depend not on the prior austenitic grain size but mostly on the phases. Concerning on the fracture toughness in HAZ, HAZ materials close to weld metal indicated higher toughness than that of base metal due to mixed structure of martensite and lower-bainite, while HAZ materials close to base metal were equivalent or slightly lower toughness than that of base metal due to the same phase as base metal of upper-bainite.

Copyright © 2012 by American Society of Mechanical Engineers
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Figure 1

Inhomogeneity of HAZ close to welded bead [3-4]

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Figure 2

Outline of research on the technical basis to judge the needs of surveillance specimen of HAZ

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Figure 3

Macroscopic picture of weldment

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Figure 5

CCT diagrams of ASTM A533B-1 steel (JHI)

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Figure 6

HAZ map in butt-welded joint

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Figure 7

Heat treatment of simulated HAZ materials

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Figure 8

Microscopic pictures of typical Sim-HAZ materials

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Figure 9

Vickers hardness distribution in Act-HAZ for JHI weldment (a), and Sim-HAZ materials for JLI and JHI (b)

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Figure 10

Fracture toughness master curves for Sim-HAZ, Act-HAZ, and base metal of JLI (a), and JHI (b).

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Figure 11

Relation between reference temperature T0 and Charpy T41J [13-14]




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