Transgranular stress-corrosion

SSRT TGSCC WOL transgranular stress corrosion cracking... 

Fig. 9. Potential-temperature diagram for sensitized TVpe 304SS in 0.01 m NaCl solution showing regions of different failure modes [29], TGSCC, transgranular stress corrosion cracking. Reproduced from Proc. 9th Int. Congr. Met. Corros., Vol. 2, pp. 185-201 (1984) by permission of the National Research Council of Canada.

Observations of the growth of transgranular stress-corrosion cracks at free surfaces, and examinations of fracture surfaces, have established that for several metal/environment systems, cracks propagate... 

NaCl solution at 105 °C, which compares to about 35 MN/m3/2 for Kiscc for the less-severely sensitized alloy. The air-cooled alloy exhibited transgranular stress corrosion and the severely-sensitized material cracked intergranularly as shown in Fig. 7.108. 

M.G. Alvarez, C. Manfredi, M. Giordano, and J. Galvele, Anodic Rate Controlling Steps in Transgranular Stress Corrosion Cracking of Alpha-Brass in NaN02 Solutions, Corros. Sci., Vol 24, 1984, p 769-780... 

J.A. Beavers and E.N. Pugh, The Propagation of Transgranular Stress-Corrosion Cracks in Admiralty Metal,Metall. Trans., Vol 11A, 1980, p 809-820... 

N. Winter, A. Atrens, W. Dietzel, V. Song, K.U. Kainer, Comparison of the hnearly increasing stress test and the constant extension rate test in the evalnation of transgranular stress corrosion cracking of magnesium. Mater. Sci. Eng. A 472 (2008) 97—106. 

E.N. Pugh, On the propagation of transgranular stress-corrosion cracks, in R.M. Latanison, J.R. Pickens (Eds.), Atomistics of Fracture, Plenum Press, New York, 1983, pp. 997-1010. 

K. Sieradzki, J.S. Kim, A.T. Cole, R.C. Newman, The relationship between dealloying and transgranular stress-corrosion cracking of copper-zinc and copper-aluminum alloys, J. Electrochem. Soc. 134 (1987) 1635-1639. 

R.N. Parkins, W.K. Blanchard Jr., B.S. Delanty, Transgranular stress corrosion cracking ofhigh pressure pipelines in contact with solutions of near neutral pH, Corrosion 50 (1994) 394—408. 

Transgranular stress corrosion cracks are known [7.49] from i) austenitic steels in acidic chloride solutions, ii) low-strength ferritic steels in acidic media, iii) ferritic steels in phosphate solutions, iv) carbon steel in water saturated with CO2 and CO, v) a-brass in ammonia solutions that do not cause surface films, vi) aluminium alloys in NaCl/K2Cr04 solutions and vii) magnesium alloys in diluted fluoride solutions. For further study of fracture surface appearance, see, e.g. Lees [7.49] and Scully [7.53]. 

FIGURE 20.33 Transgranular stress corrosion of a steam coil support. 

Transgranular stress corrosion cracking also occurs in solutions of CO-CO2-H2O containing oxygen. Recent results also indicate that unalloyed and low-alloy steels may be sensitive to anodic stress corrosion cracking in aqueous CO2 solutions. The considerable hydrogen permeation has been observed under critical conditions t > 40°C, > 1 Mpa, o > 0.5a therefore, a certain amount... 

It must be assumed in transgranular stress corrosion cracking that local accumulations of foreign atoms in areas with lattice defects outside the grain boundaries (i.e., dislocations and slip lines) are... 

Stainless steels, transgranular stress corrosion cracking MgCl2 solution (ASTM G 36-87 1987) NaCL solution (ASTM G 44-88 1988)... 

Burleigh, T. D., Gillespie, E. H., and Biondich, S. C., Blowout of Aluminum Alloy 5182 Can Ends Caused by Transgranular Stress Corrosion Cracking, Preprint from TMS Meeting, 15 November 1992. 

Defect oxide formation means poor repassivation behaviour and supports the film rupture mechanism for transgranular stress corrosion cracking which has been observed on solution annealed steels in high purity water, particularly at low oxygen contents. 

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