SEDL / STP / STP857-EB / STP32746S

Fatigue Crack Growth Behavior in a Nitrogen-Strengthened High-Manganese Steel at Cryogenic Temperatures

Ogawa, R
Department of Materials Science and Mineral Engineering and the Lawrence Berkeley Laboratory of the University of California, Berkeley, CA

Morris, JW
Department of Materials Science and Mineral Engineering and the Lawrence Berkeley Laboratory of the University of California, Berkeley, CA

Pages: 13    Published: Jan 1985

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Abstract

The fatigue crack growth rate (FCGR) of a nitrogen-strengthened high-manganese stainless steel of nominal composition 18Mn-5Ni-16Cr-0.02C-0.22N was determined in the intermediate stress-intensity factor range (20–70 MPa√m) at 77 and 4 K. Fractographic investigations were performed on the fracture surfaces. The FCGR at 4 K was very nearly the same as at 77 K and substantially below the FCGR for AISI 304LN steel. The fracture surfaces of both the high-manganese alloy and the 304LN showed a transgranular failure mode, but the detailed fractographic features varied with temperature and alloy type. The fractography was closely related to changes in the FCGR.