scholarly journals Hydrogen embrittlement, grain boundary segregation, and stress corrosion cracking of alloy X-750 in low- and high-temperature water

1997 ◽  
Author(s):  
W. Mills ◽  
M. Lebo ◽  
J. Kearns
Keyword(s):  
High Temperature ◽  
Hydrogen Embrittlement ◽  
Grain Boundary ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Boundary Segregation ◽  
Corrosion Cracking ◽  
Grain Boundary Segregation ◽  
High Temperature Water ◽  
Temperature Water

Review of the Stress Corrosion Cracking of Inconel 600

CORROSION ◽  
1975 ◽  
Vol 31 (9) ◽  
pp. 327-337 ◽  
Author(s):  
D. VAN ROOYEN
Keyword(s):  
High Temperature ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Boundary Segregation ◽  
Corrosion Cracking ◽  
Inconel 600 ◽  
High Temperature Water ◽  
Temperature Water

Abstract Intergranular stress corrosion cracking (SCC) of Inconel 600 is of concern to the nuclear power industry. Heat exchangers in commercial nuclear systems have shown SCC in only a fraction of a percent of the tubes in high temperature water, but laboratory SCC of Ni-containing alloys have been demonstrated by several research groups. This review revolves around French data, which show a reversal of the usual sensitizing effect in the case of SCC in high temperature, deaerated water. There is no cracking reported in material first heated so as to precipitate carbides at the grain boundaries, whereas high temperature annealed conditions lead to intergranular SCC in the same laboratory experiments. Electrochemically, SCC and also grain boundary corrosion are related to the potential level of a given test; however, it is not yet understood how the different grain boundary zones in Inconel 600 corrode (with and without applied stress) so that the mechanism of cracking remains speculative. Cr-depletion is sufficient to explain only some cases of intergranular corrosion. Grain boundary segregation seems to be of equal or greater importance in high temperature water, especially when the attack involves SCC. Grain boundaries may become cleaned when segregated elements dissolve in chromium carbide precipitates. Physically, precipitates at grain boundaries could possibly influence the manner in which the metal undergoes strain. Hydrogen as a cause of SCC has not been ruled out. The relationship between surface films formed and SCC of Alloy 600 in high temperature aqueous environments requires more work.

Localized Deformation Induced IGSCC and IASCC of Austenitic Alloys in High Temperature Water

2004 ◽  
Vol 261-263 ◽  
pp. 885-902 ◽  
Author(s):  
G.S. Was ◽  
B. Alexandreanu ◽  
J. Busby
Keyword(s):  
High Temperature ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Localized Deformation ◽  
High Temperature Water ◽  
Austenitic Alloys ◽  
Temperature Water

Grain boundary properties are known to affect the intergranular stress corrosion cracking (IGSCC) and irradiation assisted stress corrosion cracking behavior of austenitic alloys in high temperature water. However, it is only recently that sufficient evidence has accumulated to show that the disposition of deformation in and near the grain boundary plays a key role in intergranular cracking. Grain boundaries that can transmit strain to adjacent grains can relieve stresses without undergoing localized deformation. Grain boundaries that cannot transmit strain will either experience high stresses or high strains. High stresses can lead to wedge-type cracking and sliding can lead to rupture of the protective oxide film. These processes are also applicable to irradiated materials in which the deformation can become highly localized in the form of dislocation channels and deformation twins. These deformation bands conduct tremendous amounts of strain to the grain boundaries. The capability of a boundary to transmit strain to a neighboring grain will determine its propensity for cracking, analogous to that in unirradiated metals. Thus, IGSCC in unirradiated materials and IASCC in irradiated materials are governed by the same local processes of stress and strain accommodation at the boundary.

scholarly journals Stress Corrosion Cracking Susceptibilities of Various Stainless Steels in High Temperature Water

1980 ◽  
Vol 29 (7) ◽  
pp. 323-329
Author(s):  
Saburo Shoji ◽  
Noriyuki Ohnaka ◽  
Eiji Kikuchi ◽  
Akira Minato ◽  
Kazuo Tanno
Keyword(s):  
High Temperature ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Stainless Steels ◽  
Corrosion Cracking ◽  
High Temperature Water ◽  
Temperature Water
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