Elevated-Temperature Mechanical Behavior of a Carbon-Manganese Pressure Vessel Steel

1977 ◽  
Vol 99 (4) ◽  
pp. 359-365
Author(s):  
J. G. Early
Keyword(s):  
Elevated Temperature ◽  
Fracture Mode ◽  
Pressure Vessel ◽  
Material Constant ◽  
Creep Rupture ◽  
Pressure Vessel Steel ◽  
Aging Effects ◽  
Stress Regime ◽  
Vessel Steel ◽  
Short Time

The short-time effects of stress and temperature on the mechanical properties of a carbon-manganese pressure vessel steel were investigated using room- and elevated-temperature tensile tests and short-time creep-rupture tests. The tensile test results indicated that strain aging effects were not Significant in the temperature range 593 to 677 C (1100 to 1250 F). Analysis of the creep-rupture data, in the range 621 to 677 (1150 to 1250 F), by the Larson-Miller method using the procedure of Manson and Mendelson yielded a value of 20.7 for the material constant, C. In the temperature and stress regime studied, a linear relationship was observed between log (stress) and log (time-to-rupture). Fractographic analyses revealed a common fracture mode in all specimens tested. The fracture mode is described as an intermediate type, containing features of both transgranular and intergranular fracture.

Tests and Numerical Analysis of Cracked Rings Under Thermal Shock in the Brittle/Ductile Transition of a Pressure Vessel Steel

2005 ◽  
Author(s):  
M. Reytier ◽  
S. Chapuliot ◽  
L. Ferry ◽  
M. Ne´de´lec
Keyword(s):  
Crack Initiation ◽  
Fracture Mode ◽  
Pressure Vessel ◽  
Thermal Loading ◽  
Hot Water ◽  
Pressure Vessel Steel ◽  
External Diameter ◽  
Vessel Steel ◽  
Brittle Ductile Transition ◽  
Thermal Shocks

Thermal shocks and temperature gradients associated with large thickness constitute difficult loadings for structures integrity analysis. Moreover, at low temperature or because of irradiation effects, the pressure vessel steel 16MND5 undergoes a transition in fracture mode which may lead to cleavage initiation. The prevention of this fracture mode is generally ensured by first staying outside the brittle domain and secondly, by imposing a stress intensity factor below the fracture toughness which is determined from monotonic and isotherm standard tests. But, with various temperature-loading histories, this criterion is not faultless. Therefore, in order to study in detail rupture under thermal shocks, with several loading types (mechanical and/or thermal loadings), a specific-adapted cracked ring has been developed. It consists of a 50mm thick ring which has a crack on the external diameter and several holes through the specimen to locally heat the ring by injecting hot water which can lead to crack initiation. This particular test allows the study of crack initiation with only thermal loading or both thermal loading and external mechanical loading. This article describes in details several tests including one with cleavage rupture. Moreover, numerical calculations are presented to estimate the mechanical fields at the crack tip and the global fracture mechanics parameters as a function of the temperature. Several rupture criteria are then applied to predict the initiation.

Effect of hydrogenation on the fracture mode of a reactor pressure-vessel steel

2009 ◽  
Vol 45 (5) ◽  
pp. 613-625 ◽  
Author(s):  
N. Taylor ◽  
H. M. Nykyforchyn ◽  
O. T. Tsyrulnyk ◽  
O. Z. Student
Keyword(s):  
Fracture Mode ◽  
Pressure Vessel ◽  
Reactor Pressure Vessel ◽  
Pressure Vessel Steel ◽  
Vessel Steel ◽  
Reactor Pressure Vessel Steel ◽  
Reactor Pressure

scholarly journals The Elevated Temperature and Thermal Shock Fracture Toughnesses of Nuclear Pressure Vessel Steel

1979 ◽  
Vol 28 (308) ◽  
pp. 421-426
Author(s):  
Kazumi HIRANO ◽  
Hideo KOBAYASHI ◽  
Hajime NAKAZAWA ◽  
Atsushi NARA
Keyword(s):  
Elevated Temperature ◽  
Thermal Shock ◽  
Pressure Vessel ◽  
Pressure Vessel Steel ◽  
Vessel Steel

Dislocation structures in 16MND5 pressure vessel steel strained in uniaxial tension at −196°C

2005 ◽  
Vol 96 (8) ◽  
pp. 909-912
Author(s):  
Karel Obrtlík ◽  
Christian Robertson ◽  
Bernard Marini
Keyword(s):  
Uniaxial Tension ◽  
Pressure Vessel ◽  
Pressure Vessel Steel ◽  
Vessel Steel

scholarly journals Micromagnetic Characterization of Operation-Induced Damage in Charpy Specimens of RPV Steels

2021 ◽  
Vol 11 (7) ◽  
pp. 2917
Author(s):  
Madalina Rabung ◽  
Melanie Kopp ◽  
Antal Gasparics ◽  
Gábor Vértesy ◽  
Ildikó Szenthe ◽  
...  
Keyword(s):  
Neutron Irradiation ◽  
Pressure Vessel ◽  
Operating Conditions ◽  
Magnetic Characteristics ◽  
Pressure Vessel Steel ◽  
Training Procedure ◽  
Vessel Steel ◽  
Before And After ◽  
The Individual ◽  
Magnetic Adaptive Testing

The embrittlement of two types of nuclear pressure vessel steel, 15Kh2NMFA and A508 Cl.2, was studied using two different methods of magnetic nondestructive testing: micromagnetic multiparameter microstructure and stress analysis (3MA-X8) and magnetic adaptive testing (MAT). The microstructure and mechanical properties of reactor pressure vessel (RPV) materials are modified due to neutron irradiation; this material degradation can be characterized using magnetic methods. For the first time, the progressive change in material properties due to neutron irradiation was investigated on the same specimens, before and after neutron irradiation. A correlation was found between magnetic characteristics and neutron-irradiation-induced damage, regardless of the type of material or the applied measurement technique. The results of the individual micromagnetic measurements proved their suitability for characterizing the degradation of RPV steel caused by simulated operating conditions. A calibration/training procedure was applied on the merged outcome of both testing methods, producing excellent results in predicting transition temperature, yield strength, and mechanical hardness for both materials.

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