(Received 12 May 1986; accepted 6 February 1987)
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Stretch zones are normally observed on the surface of fracture toughness specimens that break in a ductile manner. However, no stretch zones were observed in the scanning electron microscope on the ductile fracture surfaces of austenitic stainless steels broken in accordance with ASTM E 813 procedure at cryogenic temperatures.
Research Materials Engineer, Fracture and Deformation Division, National Bureau of Standards, Boulder, CO
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