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首页> 外文会议>Society for Machinery Failure Prevention Technology Meeting; 20050418-21; Virginia Beach,VA(US) >METALLURGICAL TESTING OF GUN BARRELS
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METALLURGICAL TESTING OF GUN BARRELS

机译：炮筒的冶金测试

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摘要

The demands on today's military for lighter, cheaper, longer lasting products only increase the risk for catastrophic failure of items already facing adverse service conditions. After a medium caliber barrel failure, the Explosive Sciences Branch (ESB) of Crane Division, Naval Surface Warfare Center (NSWC Crane) performed metallurgical investigations on one damaged gun barrel, six additional barrels pulled from service and one new gun barrel, to determine if any inherent flaws or service conditions could have caused the failure. The metallurgical analysis included detailed microhardness profiling on several areas of each barrel, complete microstructure examination with a metallurgical microscope, crack depth determination via optical comparator, optical microscopy and SEM analyses on down-bore sections of the barrels, and geometrical analysis on the rifling of the barrels. Hardness differences were found between the outside edge and/or inside edge of the barrels versus the center or core of the barrels. Additionally, areas of no chrome coating, cracked coating, base metal cracking, and stress corrosion cracking were evident in the breech end of the barrel, while land damage/deformation was prominent in down-bore barrel sections. The ESB determined coating cracking and slight interface corrosion between the base metal and coating would lead to accelerated degradation (erosion, corrosion, cracking, etc.) of barrels in service. These findings show that many barrels still in use should be pulled from service and that better erosion/corrosion monitoring techniques need to be in place to better assess the condition and risk of barrels in service.
机译：当今军队对更轻，更便宜，使用寿命更长的产品的需求只会增加已经面临不利服务条件的物品发生灾难性故障的风险。在中等口径枪管故障后，海军地面作战中心起重机分部的爆炸科学处（NSB Crane）对一个损坏的枪管，另外六个退役的枪管和一个新的枪管进行了冶金研究。任何固有的缺陷或服务条件都可能导致故障。冶金分析包括在每个枪管的多个区域进行详细的显微硬度分析，通过冶金显微镜进行完整的显微组织检查，通过光学比较器确定裂纹深度，对枪管的下膛部分进行光学显微镜和SEM分析以及对枪管的膛线进行几何分析桶。在枪管的外边缘和/或内边缘与枪管的中心或内芯之间发现硬度差异。此外，在枪管的枪尾端没有铬涂层，裂纹涂层，贱金属开裂和应力腐蚀开裂的区域明显，而在下膛枪管部分则明显出现了土地损坏/变形。 ESB确定的涂层开裂以及母材和涂层之间的轻微界面腐蚀会导致使用中的枪管加速降解（腐蚀，腐蚀，开裂等）。这些发现表明，许多仍在使用中的桶应停止使用，并且需要采用更好的腐蚀/腐蚀监测技术以更好地评估使用中的桶的状况和风险。

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