A Cursory Examination of a Parachute Bag Knife, P/N 71172

Report No. ARL-TR-3892
Authors: Marc Pepi; Victor Champagne
Date/Pages: September 2006; 24 pages
Abstract: A parachute bag knife was received for a ?quick-look? analysis to determine the reason for edge deformation after normal use. The U.S. Army Research Laboratory performed hardness testing, chemical analysis, and metallography. Hardness testing in conjunction with metallography showed a layer of decarburization around the periphery of the knife (not on the blade edge, however). Chemical analysis verified alloy AISI 4130 was used. Metallography also revealed a less than optimal microstructure for this alloy. It was recommended that future parts be quenched and tempered to produce a tougher knife edge.
Distribution: Approved for public release
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Last Update / Reviewed: September 1, 2006