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DTIC ADA364181: Coating of Weapon Components with Bearing Material ... |
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by Defense Technical Information Center |
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Nodular iron pistons for the M174 Recoil Mechanism |
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characteristically yield less-than-desirable service |
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lives; the deficiency being attributed to a lack of |
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fracture toughness of the iron. Consequently, cast steel |
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pistons clad with a bearing material, required since the |
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steel does not offer the built-in lubricity indigenous to |
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nodular iron, were considered as an alternate material. |
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Cost-effective Gas Metal Arc Welding (GMAW) processing |
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techniques were developed to provide an aluminum-bronze |
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bearing surface to the steel pistons. Concurrent |
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laboratory tests were conducted on welded specimens to |
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simulate live-firing performance. The tests included |
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chemical, mechanical and metallurgical analyses. After |
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development of the GMAW procedure, including selection of |
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an aluminum-bronze bearing material, a coated steel |
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piston was manufactured at Rock Island Arsenal and |
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subjected to firing tests. Its performance in the Arsenal |
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simulator followed by live-firing at Yuma Proving Ground |
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exceeded all requirements. Future studies will provide |
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more clad steel pistons for firing tests to verify |
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material performance. In addition, strip welding and |
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explosive bonding methods will be evaluated to determine |
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the least cost method of cladding steel components with |
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aluminum-bronze. |
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Date Published: 2018-04-24 00:30:34 |
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Identifier: DTIC_ADA364181 |
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Item Size: 23445944 |
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Language: english |
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Media Type: texts |
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# Topics |
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DTIC Archive; Solanki, Mukesh; ROCK I... |
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