Relationships between Stress Relief Embrittlement, Microstructures and Fracture Appearances in Pressure Vessel Steels

1989 ◽  
Vol 75 (2) ◽  
pp. 361-368 ◽  
Author(s):  
Masaaki KATSUMATA ◽  
Kenji KOIDE ◽  
Haruo KAJI
Keyword(s):  
Pressure Vessel ◽  
Stress Relief ◽  
Pressure Vessel Steels

Stress relief cracking in MnMoNi and MnMoNiCr pressure vessel steels

1979 ◽  
Vol 37 (2) ◽  
pp. 179-186 ◽  
Author(s):  
C.J. McMahon ◽  
R.J. Dobbs ◽  
D.H. Gentner
Keyword(s):  
Pressure Vessel ◽  
Stress Relief ◽  
Pressure Vessel Steels

Experimental Program to Monitor the Irradiation Induced Embrittlement of the French Reactor Pressure Vessel Steels

2004 ◽  
Author(s):  
Guillaume Chas ◽  
Nathalie Rupa ◽  
Josseline Bourgoin ◽  
Astrid Hotellier ◽  
Se´bastien Saillet
Keyword(s):  
Mechanical Properties ◽  
Pressure Vessel ◽  
Mechanical Tests ◽  
Nuclear Industry ◽  
Experimental Program ◽  
Surveillance Program ◽  
Base Metals ◽  
Vessel Steel ◽  
Pressure Vessel Steels ◽  
Reactor Pressure

By monitoring the irradiation-induced embrittlement of materials, the Pressure Vessel Surveillance Program (PVSP) contributes to the RPV integrity and lifetime assessments. This program is implemented on each PWR Unit in France; it is mainly based on Charpy tests, which are widely used in the nuclear industry to characterize the mechanical properties of the materials. Moreover, toughness tests are also carried out to check the conservatism of the PVSP methodology. This paper first describes the procedure followed for the Pressure Vessel Surveillance Program. It presents the irradiation capsules: the samples materials (low alloy Mn, Ni, Mo vessel steel including base metals, heat affected zones, welds and a reference material) and the mechanical tests performed. Then it draws up a synthesis of the analysis of about 180 capsules removed from the reactors at fluence levels up to 7.1019 n/cm2 (E > 1 MeV). This database gathers the results of more than 10,000 Charpy tests and 250 toughness tests. The experimental results confirm the conservatism of the Code-based methodology applied to the toughness assessment.

Fracture-Flow Relationships for A533B Pressure Vessel Steel

1970 ◽  
Vol 92 (2) ◽  
pp. 330-338 ◽  
Author(s):  
J. M. Krafft ◽  
L. R. Hettche ◽  
A. M. Sullivan ◽  
F. J. Loss
Keyword(s):  
Pressure Vessel ◽  
Loading Rate ◽  
Fracture Flow ◽  
Pressure Vessel Steel ◽  
Flow Strength ◽  
Vessel Steel ◽  
Pressure Vessel Steels ◽  
Rapid Loading ◽  
Harmonic Flow ◽  
Spectrum Effect

The large scatter emerging from KIc measurements for heavy walled pressure vessel steels is examined in view of new data for A533B. Extensive plastic flow data at −220 deg F and 80 deg F has revealed a marked, and apparently harmonic, flow strength variation repeated at strain rate intervals in ratio of about 20. The tension skewed path over these ridges is related to the KIc behavior, for which a corresponding variational pattern with loading rate K˙ is observed. The variational pattern, or rate spectrum effect, is large compared to the average speed sensitivity of KIc, suggesting that transition temperatures values could be measured at a more moderate, though rapid, loading rate to avoid the inertial ringing effects of impact.

Effect of stress relief temperature and cooling rate on pressure vessel steel welds

2002 ◽  
Vol 327 (1) ◽  
pp. 76-79 ◽  
Author(s):  
M.K Miller ◽  
S.S Babu ◽  
M.A Sokolov ◽  
R.K Nanstad ◽  
S.K Iskander
Keyword(s):  
Cooling Rate ◽  
Pressure Vessel ◽  
Stress Relief ◽  
Pressure Vessel Steel ◽  
Vessel Steel ◽  
Steel Welds
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