Crack susceptibility

Standard Test Methods for Use ofMattsson s Solution of pH 7.2 to Evaluate the Stress Corrosion Cracking Susceptibility of Copper—Zinc Alloys, ASTM G 37-85, American Society for Testing and Materials, Philadelphia, Pa., 1992. 

Sheehan, J. P., Morin, C. R. and Packer, K. F., Study of Stress Corrosion Cracking Susceptibility of Type 316L Stainless Steel In-Vitro , in Corrosion and Degradation of Implant Materials, Second Symposium , (Eds) A. C. Fraker and C. D. Griffin, 57-72 ASTM Publication STP 859, Philadelphia (1985)... 

However, whilst the effects of change in alloy composition upon stress-corrosion cracking susceptibility in the present context may be partly due to their effect upon stacking-fault energy, this does not constitute a complete explanation, since alloying may have significant effects upon electrochemical parameters. The effect of the zinc content of brasses upon their filming characteristics has already been mentioned, while in more recent... 

For normal commercial-quality mild steels in the annealed or normalised conditions in which they are almost invariably used, various workers have shown that the carbon content of the steel is the major factor determining intergranular cracking susceptibility. Figure 8.13 shows the threshold stresses for a series of commercial mild steels of different carbon contents caused to crack in boiling 4n NH4NO3. The trend of the result suggests... 

The cracking susceptibility of a micro-alloyed HSLA-100 steel was examined and compared to that of a HY-100 steel in the as-received condition and after heat treatment to simulate the thermal history of a single pass weld. Slow strain rate tensile tests were conducted on samples of these alloys with these thermal histories in an inert environment and in an aqueous solution during continuous cathodic charging at different potentials with respect to a reference electrode. Both alloys exhibited reduced ductilities at cathodic potentials indicating susceptibility to hydrogen embrittlement. The results of these experiments will be presented and discussed in relation to the observed microstructures and fractography. 

A refinement to the CE is the parameter Pern, which has been developed to predict hydrogen cracking susceptibility as it relates to weldability. The Pcm chemistry parameter, applicable to most low-alloy steels having less than -0.18% carbon, is defined as ... 

Cultivar Week of Origin ripening Flowering Growth Start of cropping Susceptibility to cracking Susceptibility to rot Remarks... 

Fig. 7. Stress corrosion cracking susceptibility of sensitized Type 304SS in 0.01 M Na2S04 at 250 °C as a function of potential [29]. Reproduced from Proc. 9th Int. Congr. Met. Corros. Vol. 2, pp. 185-201 (1984) by permission of the National Research Council of Canada.

Stress cracking susceptibility in adhesives containing solvents. 

Aluminum and alloys are not suitable for (1) alkalis, (2) acids at pH 4.5, and (3) mercury, which can be a significant risk in some liquified natural gas operations. The heat treatable, high-strength aluminum alloys of the 2000- and 7000-series are rarely used because of environmental cracking susceptibility. Aluminum and its alloys are susceptible to chloride pitting and to concentration cell problems such as crevice corrosion and under-deposit corrosion. 

A. Kawashima, A.K. Agrawal, and R.W. Staehle, Effect of Oxyanions and Chloride Ion on the Stress Corrosion Cracking Susceptibility of Admiralty Brass in Nonammonical Aqueous Solutions, Stress Corrosion Cracking The Slow Strain-Rate Technique, STP 665, G.M. Uglansky and J.H. Payer, Ed., ASTM, 1979, p 266-278... 

Fig- 7.77 Relationship between pH/potential conditions for severe cracking susceptibility of mild steel in various environments and the stability region for solid and dissolved species on the potential-pH diagram. Source Ref 11 5... 

Cane M W F, Dolby R E and Baker R G A slow bend test for HAZ hydrogen cracking susceptibility and its correlation with welding experience . Welding Res Inti 3 (2) 1973 1-16. 

A typical rack employed for installation of specimens in pilot plants is shown in Fig. 6. Both corrosion coupons, 2 X 1 X 0.35 in. thick, and bend specimens intended to determine stress-corrosion cracking susceptibility, are included in the installation for aqueous corrosion testing. Specimens are separated by high density alumina spacers to eliminate electrochemical effects. During exposure, the racks are welded to existing components in the pilot plant equipment. 

C.M. Rangel, T.M. Sdva, M. da Cunha Belo, Semiconductor electrochemistry approach to passivity and stress corrosion cracking susceptibility of stainless steels, Electrochim. Acta 50 (2005) 5076-5082. 

R. Valient, The influence of different Nb-contents on the hot-cracking susceptibility of Ni-base weld metals type 70/20, in T. BoUinghaus, H. Herold (Eds.), Hot Cracking Phenomena in Welds, Springer-Verlag, Berlin, 2005, pp. 141—164. 

For austenitic steels that are resistant to transformation on cold working (e.g., type 310), nitrogen is the element largely responsible for stress-cracking susceptibility, whereas additions of carbon decrease susceptibility (Fig. 19.10) [60]. The effect is related to alloy imperfection structure rather than to any shift of either critical or corrosion potential [59]. Stabilizing additions effective in preventing intergranular corrosion, such as titanium or columbium, have no... 

The use of spot hydrogen flux measurennents Cracking susceptibility... 

F ure 1138 Effect of the temperature of heat treatments on hydrogen cracking susceptibility of quenched carbon steel (0.25% C) cathodically polarized at a potential of -0.14 V in carbonate-bicarbonate solution at 90 °C. Shown is the ratio of the reduction in area measured in the corrosive environment to that measured in a non-corrosive environment (oil) in SCC tests... 

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