Microstructure and Mechanical Properties of WWER-440 Reactor Vessel Metal After Service Life Expiration and Recovery Anneal

2009 ◽  
pp. 248-248-12 ◽  
Author(s):  
IV Gorynin ◽  
EV Nesterova ◽  
VA Nikolaev ◽  
VV Rybin
Keyword(s):  
Mechanical Properties ◽  
Service Life ◽  
Reactor Vessel ◽  
Microstructure And Mechanical Properties ◽  
Recovery Anneal

Microstructure and Mechanical Properties of Ce-Y-TZP Ceramic Composites for Ceramic Plunger and Ball Valve

2007 ◽  
Vol 336-338 ◽  
pp. 1197-1199
Author(s):  
Bao Qing Zhang ◽  
Xu Ping Lin ◽  
Jing Tao Ma
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
Service Life ◽  
Bending Strength ◽  
Ceramic Composites ◽  
Ball Valve ◽  
Microstructure And Mechanical Properties ◽  
Structural Details

Microstructure and mechanical properties of CeO2/Y2O3/ZrO2 ceramics were investigated using ultrafine CeO2/Y2O3/ZrO2 powder as the starting material. The structures of CeO2/Y2O3/ZrO2 containing 8~12mol% CeO2 were composed of tetragonal phases. They exhibited an extremely high bending strength (950 MPa) and fracture toughness (12MPa·m1/2). The structural details of CeO2/Y2O3/ ZrO2 were studied by TEM, SEM and XRD. The effects of the structure on mechanical properties were discussed. Plungers and ball valves by the CeO2/Y2O3/ZrO2 ceramics have higher wear resistance and corrosion resistance than metal. Their service life is about 6 ~ 10 fold more than that of metal.

Changes in Microstructure and Mechanical Properties of Cr-Mo Reactor Vessel Steels During Long-Term Service

1985 ◽  
Vol 107 (3) ◽  
pp. 285-294 ◽  
Author(s):  
Y. Nishizaka ◽  
Y. Hara ◽  
A. Hori ◽  
H. Tsukahara ◽  
K. Miyano ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Rupture Strength ◽  
Reactor Vessel ◽  
Steel Matrix ◽  
Metallographic Examination ◽  
Microstructure And Mechanical Properties ◽  
Carbide Morphology ◽  
The Matrix ◽  
Service Environments

Changes in microstructure and mechanical properties of 1Cr-0.5Mo and 2.25Cr-1Mo steels during long-term service have been investigated. The study includes inspection of a 1Cr-0.5Mo steel reactor vessel which operated for 20 yr and tests on specimens that had been exposed to service environments. The reactor vessel, exposed at 490 to 530°C for 170,000 hr (about 20yr), showed appreciable decrease in the room temperature yield strength, impact toughness and creep rupture strength compared with the original properties. The service exposure caused changes in carbide morphology and species, forming M2C and M7C3 carbides and transferring significant amounts of Cr and Mo from the matrix to carbides; only 32 percent of the total Mo and 72 percent of the total Cr remained in the matrix. The microstructure of 2.25Cr-1Mo steel showed higher stability than that of 1Cr-0.5Mo steel, although a similar transfer of Mo and Cr from the matrix to carbides took place. The Mo and Cr contents remaining in the 2.25Cr-1Mo steel matrix after a 2-yr exposure were only 25 and 74 percent, respectively, of the total quantities in the steel. The partitioning of Mo and Cr to carbides could increase the stability of carbides and consequently reduce the carbon content in the matrix. The mechanical properties are influenced by both the change in the composition of the matrix and the change in carbide morphology. The metallographic examination provides useful information, although qualitative at this stage, on the degree of deterioration of materials.

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