Nondestructive Flaw Detection and Density Measurements in Powder Metallurgy Parts

粉末冶金零件的无损探伤和密度测量

• 批准号: 9360313
• 负责人: Duane Johnson
• 金额: $ 6.5万
• 依托单位: SE Systems Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-01-15 至 1994-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9360313&HistoricalAwards=false
• 关键词: Nondestructive; Flaw; Detection; Density; Measurements

9360313 Johnson The use of powder metallurgy (P/M) for net or near net shaped formed parts is expanding at a very rapid rate. This growth is due to the major savings in labor, materials and energy that can arise from the use of P/M technology compared to conventional metallurgical and machining processes. P/M has the advantage of being a very rapid and economic producer of net shape and near net shape parts, while using less energy than casting, forging, or machining. The quality and reliability of P/M parts could be improved dramatically by the development of a reliable and economic nondestructive inspection method capable of detecting cracks, laminations and other parameters effecting part performance. Recent work conducted indicates that eddy current methods have excellent potential for nondestructive inspection of P/M parts. It is also evident that eddy current responses from P/M parts are often much more complex than from conventional metallurgical parts and additional research is required to permit application of eddy current technology routinely to P/M parts, particularly green or unsintered P/M parts. This research is to develop the eddy current technology (probes, instrumentation, data processing, and test procedures) necessary to permit routine inspection of P/M parts. The test instrumentation will be based on a general purpose, computer based, multi frequency instrument. The feasibility of using computer based eddy current methods to detect cracks and other anomalies, and measure density and other variables, in both ferrous and non ferrous, green and sintered P/M parts will be demonstrated.

9360313约翰逊粉末冶金(P/M)在净成形或近净成形零件中的应用正在以非常快的速度扩展。这一增长是由于与传统的冶金和机械加工工艺相比，使用粉末冶金技术可以节省大量的劳动力、材料和能源。粉末冶金的优点是快速、经济地生产净形状和接近净形状的零件，同时比铸造、锻造或机械加工消耗更少的能源。通过开发一种可靠、经济的无损检测方法来检测影响零件性能的裂纹、叠层和其他参数，可以显著提高粉末冶金零件的质量和可靠性。最近的工作表明，涡流检测方法在粉末冶金零件无损检测方面具有很好的潜力。同样明显的是，粉末冶金零件的涡流响应往往比传统冶金零件的涡流响应复杂得多，需要进一步的研究才能将涡流技术常规地应用于粉末冶金零件，特别是生坯或未烧结的粉末冶金零件。这项研究是为了开发必要的涡流技术(探头、仪器、数据处理和测试程序)，以允许对粉末冶金零件进行常规检查。测试仪器将基于通用的、基于计算机的多频率仪器。将论证用计算机涡流方法检测黑色金属和有色金属、生坯和烧结粉末冶金零件中的裂纹和其他异常，以及测量密度和其他变量的可行性。