Abstract
A study has been made of the HE and SCC of a type 304 and a type 310 austenitic stainless steel, and the results correlated with the presence or absence of α′ martensite, determined by means of a ferrite detector. Hydrogen induced slow crack growth (SCG) was observed at room temperature when type 304 was stressed i) in 1 psig (∼105 N/m2) gaseous hydrogen, ii) after high temperature charging, and iii) while undergoing cathodic charging. The fracture surfaces corresponding to SCG were primarily transgranular and cleavage-like, and were found to be associated with α′. Conditions i) to iii) did not produce SCG in the type 310 steel, in which α′ martensite was not detected, nor did SCG occur when type 304 was stressed in gaseous hydrogen above the MD temperature (∼110°C). These observations indicated that the formation of the martensitic phase was a prerequisite for SCG under these test conditions. Stressing of type 310 while it was undergoing cathodic charging at room temperature was found to produce shallow, nonpropagating cracks, confirming earlier reports that austenite can be embrittled by hydrogen in the absence of α′. SCC occurred in both alloys in boiling aqueous MgCl2 (154°C) with no evidence for α′ formation. The results are discussed in terms of the mechanisms of HE and SCC.
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Formerly Research Associate, Department of Metallurgy and Mining Engineering, University of Illinois.
Formerly Corrosion-Control Analyst with the Physical Plant at the University of Illinois.
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Eliezer, D., Chakrapani, D.G., Altstetter, C.J. et al. The influence of austenite stability on the hydrogen embrittlement and stress- corrosion cracking of stainless steel. Metall Trans A 10, 935–941 (1979). https://doi.org/10.1007/BF02658313
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DOI: https://doi.org/10.1007/BF02658313