A study of the mechanism of stress-corrosion crack propagation in AISI 4340 steel in aqueous 3.5 wt.% NaCl solution

1987 ◽  
Vol 58 (12) ◽  
pp. 565-569 ◽  
Author(s):  
In-Won Kang ◽  
Jong-Kyo Choi ◽  
Su-Il Pyun
Keyword(s):  
Crack Propagation ◽  
Stress Corrosion ◽  
Stress Corrosion Crack ◽  
Nacl Solution ◽  
Aisi 4340 Steel ◽  
4340 Steel ◽  
Aisi 4340

Electrochemical Conditions at the Tip of an Advancing Stress Corrosion Crack in AISI 4340 Steel

CORROSION ◽  
1970 ◽  
Vol 26 (12) ◽  
pp. 539-542 ◽  
Author(s):  
J. A. SMITH ◽  
M. H. PETERSON ◽  
B. F. BROWN
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Crack ◽  
Aisi 4340 Steel ◽  
4340 Steel ◽  
Aisi 4340

Environmental Effects of Sulfur and Sulfur Compounds on the Resistance to Stress Corrosion Cracking of AISI 4340 Steel in Aqueous Chloride Solutions

CORROSION ◽  
1969 ◽  
Vol 25 (8) ◽  
pp. 342-344 ◽  
Author(s):  
A. TIRMAN ◽  
E. G. HANEY ◽  
PAUL FUGASSI
Keyword(s):  
Sodium Chloride ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Prior Treatment ◽  
Aisi 4340 Steel ◽  
Aqueous Sodium ◽  
4340 Steel ◽  
Resistance To Stress ◽  
Aisi 4340

Abstract The resistance to stress corrosion cracking of AISI 4340 steel foil in 0.6M aqueous sodium chloride, acidified to pH 1.5 with hydrochloric acid, is greatly decreased by prior treatment of the specimens for short periods of time with aqueous and nonaqueous solutions of sulfur, organic and inorganic sulfides, sulfur dioxides, and the inorganic salts of sulfurousand sulfuric acids. It is suggested that this prior treatment produces sulfided areas which are inhibitors of the combination of atomic hydrogen into molecular hydrogen. The decreased resistance to stress corrosion cracking is thus attributed to hydrogen embrittlement. If the stress corrosion cracking test is made in 0.6M aqueous sodium chloride, adjusted to an initial pH of 8, the effect of a prior sulfiding treatment is small. The formation of such sulfided areas in practice result from the exposure of 4340 steels to industrial atmospheres which may contain hydrogen sulfide, sulfur dioxide, and elemental sulfur.

A Study of Transient Crack Growth in AISI 4340 Steel in NaCl Solution

CORROSION ◽  
1985 ◽  
Vol 41 (3) ◽  
pp. 151-159 ◽  
Author(s):  
D. D. Macdonald ◽  
H. H. Chung
Keyword(s):  
Crack Growth ◽  
Nacl Solution ◽  
Aisi 4340 Steel ◽  
4340 Steel ◽  
Aisi 4340

The Effect of Some Electrolytes on the Stress Corrosion Cracking of AISI 4340 Steel

CORROSION ◽  
1972 ◽  
Vol 28 (9) ◽  
pp. 340-344 ◽  
Author(s):  
H. R. BAKER ◽  
C. R. SINGLETERRY
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Ph Dependence ◽  
Corrosion Cracking ◽  
Alkaline Solutions ◽  
Poor Correlation ◽  
Time To Failure ◽  
Aisi 4340 Steel ◽  
4340 Steel ◽  
Aisi 4340

Abstract The effects of solutions of 16 different electrolytes on the stress corrosion cracking (SCC) of AISI 4340 steel U-bend specimens have been studied at various concentrations and at 25, 65, and 100 C (77, 149, and 212 F). Stresses were near the yield point of the alloy. In unbuffered solutions of neutral salts, there was poor correlation between time to failure and the initial or final pH of the solution. In strongly buffered solutions, there was a strong pH dependence; the time to failure in 10% NaCl increased about 100 fold between pH 4–5 and pH 7. Susceptibility to cracking increased moderately with the concentration of KNO3 solutions, but decreased with rising concentration of NaCl solutions. The cracking rate increased by 50% per 10 C for NaCl solutions. The rate increased 85% per 10 C for KNO3 solutions. KNO2 or NaNO2, dicyclohexylammonium nitrate, some K2CrO4 solutions and all alkaline solutions with a strong reserve of base inhibited SCC by factors of 10 to 100 times as compared with cracking in distilled H2O.

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