Applicability of Alloy 690/52/152 Crack Growth Testing Conditions to Plant Components

2017 ◽  
pp. 15-25
Author(s):  
Warren Bamford ◽  
Steve Fyfitch ◽  
Raj Pathania ◽  
Paul Crooker
Keyword(s):  
Crack Growth ◽  
Testing Conditions ◽  
Alloy 690 ◽  
Plant Components

Fracture Behavior of CVD Diamond

1991 ◽  
Vol 239 ◽  
Author(s):  
M. D. Drory ◽  
J. F. Gardinier ◽  
J. M. Pinneo
Keyword(s):  
Crack Growth ◽  
Fracture Behavior ◽  
Slow Crack Growth ◽  
Diamond Films ◽  
Cvd Diamond ◽  
Testing Conditions ◽  
Plasma Enhanced Cvd ◽  
Low Load ◽  
Length Measurements ◽  
Corrosion Susceptibility

ABSTRACTThe fracture behavior of CVD diamond is examined by indentation experiments in which slow crack growth has been observed. Diamond films of 400μm thickness were prepared by plasma-enhanced CVD on a silicon substrate, subsequently removed from the substrate, and polished for indentation testing. A microhardness tester was used to produce Vickers indentations under low load. Crack length measurements over time revealed susceptibility to slow crack growth in ambient testing conditions. The stress-corrosion susceptibility coefficient, N, was measured as 9.3.

scholarly journals Effect of thermal aging and irradiation on microstructure and crack growth response of Alloy 690

2021 ◽  
Author(s):  
Bogdan Alexandreanu ◽  
Yiren Chen ◽  
Xuan Zhang ◽  
Wei-Ying Chen
Keyword(s):  
Crack Growth ◽  
Thermal Aging ◽  
Growth Response ◽  
Alloy 690

Analysis of Fatigue Crack Growth in Standard Endurance Test Specimens in Support of Total Life Approaches to Fatigue Assessment

2016 ◽  
Author(s):  
Jonathan Mann ◽  
Marius Twite ◽  
M. Grace Burke
Keyword(s):  
Stainless Steel ◽  
Fatigue Crack ◽  
Austenitic Stainless Steel ◽  
Crack Growth ◽  
Load Drop ◽  
Design Curve ◽  
Fatigue Design ◽  
Numerical Predictions ◽  
Total Life ◽  
Plant Components

The ASME Boiler & Pressure Vessel Code Section III method for the evaluation of fatigue in nuclear plant components uses a fatigue design curve derived from the testing of standard cylindrical specimens to describe the fatigue endurance of austenitic stainless steel components. The test results describe the number of cycles to achieve a 25% total load drop within a standard specimen (approximately equal to a 3 mm crack) under membrane loading conditions and the design curve is commonly associated with fatigue initiation. However, for non-standard loading conditions, such as the case of a thermal gradient within a component where a crack may be growing into a decreasing stress field, this description of initiation may be overly conservative. Alternative approaches, such as the total life approach, may provide better representations of fatigue life in real plant components. By separating out quantifiable portions of long crack growth (Stage II) from the current design curve, alternative definitions of initiation can be derived and subsequently used in conjunction with standard fracture mechanics in order to model fatigue more accurately. In this paper numerical methods are used to model the fatigue crack growth between starting crack depths of 0.25 mm, and the depth associated with a 25% load drop in a standard cylindrical specimen. The numerical predictions are compared with striation spacings measured at a range of crack depths on the fracture surfaces of austenitic stainless steel specimens tested in both air and water environments, under strain control. A good correlation between numerical predictions and the measured striation spacings was obtained and the results are used to characterise different stages of fatigue cracking. Based upon the methods developed in this paper, modified fatigue design curves, using alternative definitions of crack initiation, are proposed and their applications in total life approaches to fatigue assessment are discussed, based on a worked example of a thermally fatigued stepped pipe experiment.

scholarly journals The Effects of Metallurgical Factors on PWSCC Crack Growth Rates in TT Alloy 690 in Simulated PWR Primary Water

2015 ◽  
Vol 46 (6) ◽  
pp. 2768-2780 ◽  
Author(s):  
Toshio Yonezawa ◽  
Masashi Watanabe ◽  
Atsushi Hashimoto
Keyword(s):  
Crack Growth ◽  
Growth Rates ◽  
Alloy 690 ◽  
Primary Water ◽  
Crack Growth Rates

scholarly journals Crack growth and cracking behavior of Alloy 600/182 and Alloy 690/152 welds in simulated PWR primary water

2019 ◽  
Vol 51 (1) ◽  
pp. 228-237 ◽  
Author(s):  
Yun Soo Lim ◽  
Dong Jin Kim ◽  
Sung Woo Kim ◽  
Hong Pyo Kim
Keyword(s):  
Crack Growth ◽  
Alloy 600 ◽  
Cracking Behavior ◽  
Alloy 690 ◽  
Primary Water
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