scholarly journals Environmentally Assisted Cracking Behavior of Low Alloy Steels in Simulated BWR Coolant Conditions

10.5772/26746 ◽  
2011 ◽  
Author(s):  
J. Y. ◽  
J. J. ◽  
J. S. ◽  
R. C.
Keyword(s):  
Low Alloy Steels ◽  
Cracking Behavior ◽  
Environmentally Assisted Cracking ◽  
Alloy Steels

Sulfide Stress Corrosion of Some Medium and Low Alloy Steels

CORROSION ◽  
1967 ◽  
Vol 23 (6) ◽  
pp. 154-172 ◽  
Author(s):  
E. SNAPE
Keyword(s):  
Stress Corrosion ◽  
Room Temperature ◽  
Fracture Strain ◽  
Low Alloy Steels ◽  
Cracking Behavior ◽  
Room Temperature Storage ◽  
Sulfide Stress ◽  
Alloy Steels ◽  
Bend Tests ◽  
Temperature Storage

Abstract A study made of factors influencing sulfide-stress corrosion of a number of low alloy and medium alloy steels showed that their delayed failures when exposed simultaneously to stress and the corrosive action of acidified brine-hydrogen sulfide solutions have most of the features of hydrogen induced, delayed brittle failures. Different steels subjected to the same exposure conditions showed varying degrees of embrittlement as measured by ductility loss in bend tests. Ductility could be restored partially by room temperature storage. Ductility restoration was related to the amount of hydrogen removed after exposure. Delayed failure under stress occurs when corrosion generated hydrogen is absorbed, and lowers fracture strain until it equals the strain under load. A minimum applied stress was obtained for each steel below which failure did not occur. This “threshold” stress decreased as strength level increased and depended simultaneously on composition and microstructure. Nickel had little effect on cracking behavior of a steel whereas carbon appeared to be detrimental. Twinned martensite was more susceptible than untwinned martensite. Steels containing austenite were more resistant than body-centered steels.

Corrosion of Carbon Steel and Low-Alloy Steel Weldments

2006 ◽  
pp. 13-41
Keyword(s):  
Heat Treatment ◽  
Carbon Steel ◽  
Postweld Heat Treatment ◽  
Low Alloy Steels ◽  
Remedial Measures ◽  
Low Alloy Steel ◽  
Environmentally Assisted Cracking ◽  
Alloy Steels ◽  
Postweld Heat

Abstract Carbon and low-alloy steels are the most frequently welded metallic materials, and much of the welding metallurgy research has focused on this class of materials. Key metallurgical factors of interest include an understanding of the solidification of welds, microstructure of the weld and heat-affected zone (HAZ), solid-state phase transformations during welding, control of toughness in the HAZ, the effects of preheating and postweld heat treatment, and weld discontinuities. This chapter provides information on the classification of steels and the welding characteristics of each class. It describes the issues related to corrosion of carbon steel weldments and remedial measures that have proven successful in specific cases. The major forms of environmentally assisted cracking affecting weldment corrosion are covered. The chapter concludes with a discussion of the effects of welding practice on weldment corrosion.

Stress Corrosion Cracking of 13Cr Steels in CO2-H2S-Cl− Environments

CORROSION ◽  
1985 ◽  
Vol 41 (4) ◽  
pp. 211-219 ◽  
Author(s):  
H. Kurahashi ◽  
T. Kurisu ◽  
Y. Sone ◽  
K. Wada ◽  
Y. Nakai
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Tensile Tests ◽  
Constant Load ◽  
Corrosion Cracking ◽  
Low Alloy Steels ◽  
Intergranular Cracking ◽  
Cracking Behavior ◽  
Alloy Steels ◽  
Absorption Measurements

Abstract Stress corrosion cracking (SCC) behavior of two 13Cr steels was investigated in aqueous CO2-H2S environments. U-bend tests, constant load tensile tests, and corrosion tests were performed in CO2 environments containing different amounts of H2S. In addition, the slow strain rate tensile (SSRT) tests and hydrogen absorption measurements were done under cathodic hydrogen charging conditions to determine why 13Cr steels are more susceptible to SCC in H2S environments than low alloy steels are. The 13Cr steels were less resistant to SCC in the CO2-H2S environments than low alloy steels were, but some 13Cr steels were not subject to SCC even at a hydrogen sulfide partial pressure of 0.3 atm. Furthermore, it was found that SCC in a CO2-H2S environment was caused by hydrogen embrittlement and that the SCC susceptibility of 13Cr steels was affected by their intergranular cracking behavior. Thus, their microstructures and carbide dispersions are important factors in defining SCC susceptibility of 13Cr steels.

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