The Elevated Temperature Properties of Two 81mm Mortar Tube Alloys 4337M and 4140
WATERVLIET ARSENAL NY
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An evaluation was made of the effect of room and elevated temperatures 800 to 1200F and times at these temperatures 0 to 30 hours on the mechanical properties of two mortar tube alloys, AISI 4140 and AISI 4337 modified, quenched and tempered to four strength levels. The elevated temperature yield strength and ductility after exposure to the various temperatures for various times are discussed. The room temperature yield strength and -40F impact energy after exposure to various temperatures for various times are also discussed. Results of the elevated temperature tensile testing of the two alloys showed that the yield strength decreases rapidly with high temperatures. The ductility RA increases with increasing temperature and remains fairly constant with time at temperature. The room temperature yield strength decreases with time after exposure at temperatures above the tempering temperature of the alloy. The -40F Charpy V-notch impact strength increases after exposure at temperatures higher than the tempering temperature of the alloy. Increasing the room temperature yield strength by lowering the tempering temperature does not significantly increase the elevated temperature yield strength of the alloy.
- Metallurgy and Metallography