Role of Selective Dissolution in Transgranular Stress-Corrosion Cracking: Studies of Transient and Steady-State Dealloying in Copper-Gold Alloys

2009 ◽  
pp. 86-86-14 ◽  
Author(s):  
WF Flanagan ◽  
JB Lee ◽  
D Massinon ◽  
M Zhu ◽  
BD Lichter
Keyword(s):  
Steady State ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Selective Dissolution ◽  
Corrosion Cracking ◽  
Gold Alloys ◽  
Copper Gold ◽  
Transient And Steady State

Electron Metallography of Chemical Attack Upon Some Alloys Susceptible to Stress Corrosion Cracking

CORROSION ◽  
1963 ◽  
Vol 19 (11) ◽  
pp. 373t-389t ◽  
Author(s):  
H. W. PICKERING ◽  
P. R. SWANN
Keyword(s):  
Aluminum Alloys ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Surface Roughening ◽  
Gold Alloys ◽  
Atom Concentration ◽  
Chemical Attack ◽  
Copper Gold ◽  
Slip Planes

Abstract The microstructures of deformed copper-gold, copper-aluminum, copper-zinc and magnesium-aluminum alloys were examined by transmission electron microscopy. These specimens were further examined after exposure to solutions which do and do not cause stress corrosion cracking. Exposure to “cracking” solutions resulted in a localized pitting or tubular form of attack, whereas the solutions which did not produce cracking caused a uniform surface roughening. When thin-foil specimens were deformed within the corrosive environments, the tubular attack and the surface roughening were observed to be enhanced in the regions of heavy deformation. Observations also indicated that for all the alloys investigated, static dislocations did not initiate chemical attack. In general, the pitting or tubular type of attack may be initiated at grain boundaries, antiphase boundary junctions in ordered copper-gold alloys, at precipitates and the substructure of twins in magnesium-aluminum alloys and at other sites which could not be identified. It was concluded that compositional rather than physical disturbances initiate preferential chemical attack on the surface of the alloys studied. For copper-gold alloys the superficial chemical disturbance can be as small as a six-atom cluster. Rates of pitting greater than 0.4 cm/hr can be attained for copper-gold alloys, which compares well with stress corrosion crack velocities. In the discussion of these results a new mechanism for transgranular stress corrosion is presented. It is proposed that when susceptible alloys are exposed to stress corrosion cracking environments a mechanically weak, pitted structure is produced along active slip planes, and that ductile fracture occurs through this corroded material. The chemical activity of the slip planes, which are believed to initiate the pitting attack, is discussed in relation to (a) the type of surface slip structure found in alloys where cross slip is difficult, (b) increase in solute atom concentration at the crack tip through the mass transfer of solute atoms to the surface by planar groups of moving dislocations, and (c) segregation and precipitation on slip planes. It was found that very fine precipitates, which are either an intermediate magnesium-aluminum phase or Mg17Al12, formed on the basal planes of quenched magnesium-1 or 7 atomic percent aluminum (<0.001 percent Fe, Cu or Ni) alloys when aged at room temperature. The presence of these precipitates was associated with the transgranular stress corrosion susceptibility of these alloys.

Stress Corrosion Cracking of Duplex Stainless Steels

2013 ◽  
Vol 794 ◽  
pp. 552-563 ◽  
Author(s):  
Indranil Chattoraj
Keyword(s):  
Corrosion Resistance ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Stainless Steels ◽  
Fracture Morphology ◽  
Selective Dissolution ◽  
Corrosion Cracking ◽  
Duplex Stainless Steels ◽  
Secondary Phases

The relative superiority of duplex stainless steels (DSS) over austenitic grades with regards to stress corrosion cracking (SCC) is discussed. The benefits of N to SCC resistance of DSS are provided. The selective dissolution of phases and its impact on corrosion SCC is reviewed. The hydrogen embrittlement of DSS is reviewed with emphasis on the ferrite participation, the role of environments and fracture morphology. The evolution of secondary phases and precipitates and the resultant change in corrosion resistance and SCC in DSS is discussed.

Role of Stress in the Stress Corrosion Cracking of a Mg-Al Alloy

CORROSION ◽  
1973 ◽  
Vol 29 (6) ◽  
pp. 251-260 ◽  
Author(s):  
W. R. WEARMOUTH ◽  
G. P DEAN ◽  
R. N. PARKINS
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Al Alloy

On the role of intergranular nanocavities in long-term stress corrosion cracking of Alloy 690

2021 ◽  
pp. 117453
Author(s):  
Zhao Shen ◽  
Edward Roberts ◽  
Naganand Saravanan ◽  
Phani Karamched ◽  
Takumi Terachi ◽  
...  
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Alloy 690

The role of retained austenite in stress corrosion cracking of steels

1991 ◽  
Vol 18 (6) ◽  
pp. 1023-1028
Author(s):  
F. Solana ◽  
C. Takamadate ◽  
I. M. Bernstein ◽  
W. Thompson
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Retained Austenite ◽  
Corrosion Cracking
Sign in / Sign up

Export Citation Format

Share Document