SYMPOSIA PAPER Published: 01 January 1985
STP34525S

Experimental Observations of Ductile Crack Growth in Type 304 Stainless Steel

Source

J-integral fracture toughness tests were performed at room temperature on small compact tension (1/2TCT) specimens of stainless steel Type 304 (Unified Numbering System [UNS] S30400). The ductile crack growth resistance curve was measured with the multi-specimen heat tinting method and automatically recorded using the potential drop (PD) technique and an optical system. The first parts of the curves were different for each method, however, for larger Δa values the curves were nearly the same. Profile measurements of the stretch zone showed blunting to be best represented by the formula J = 3.5σfΔa. There was no distinct separation between the blunting and stable crack growth phenomena. A continuous process of alternating crack-tip stretching and ductile crack extension was observed from the very beginning up to final crack extension (about 3 mm). Ductile initiation (formation of first dimples) was measured at about 300 kJ · m−2 (Ji) and “onset of stable crack growth” was measured at about 750 kJ · m−2 (JQ).

Author Information

de Vries, MI
Netherlands Energy Research Foundation ECN, Petten, ZG, Netherlands
Schaap, B
Netherlands Energy Research Foundation ECN, Petten, ZG, Netherlands
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Details
Developed by Committee: E08
Pages: 183–195
DOI: 10.1520/STP34525S
ISBN-EB: 978-0-8031-4923-6
ISBN-13: 978-0-8031-0419-8