GH4169高温合金粉末注射成型技术应用研究

Research on Application of GH4169 Superalloy Powder Injection Molding Technology

摘要: 采用粉末冶金注射成型技术制备了GH4169高温合金火工品零件半精毛坯，对坯料进行了尺寸检测、外观检测、金相分析及拉伸试验。试验结果表明：粉末注射成型生产的毛坯尺寸收缩数据满足零件生产精度要求，试验件经金相分析内部存在一定空隙；烧结炉中不同位置制备的毛坯试验件之间的抗拉强度与在炉中的位置存在一定关系，所有位置的抗拉强度均低于棒料均值，平均降幅为21.7%，试验件延伸率整体低于棒料均值；装配后的成品结构强度及发火指标满足设计要求范围，且包络于历史范围，粉末冶金注射成型技术具备在火工品应用的基本条件。

Abstract: GH4169 superalloy semi-finished blanks for initiating explosive devices were fabricated by powder metallurgy injection molding technology. Dimensional inspection, visual examination, metallographic analysis and tensile tests were carried out on the blanks. The experimental results show that the dimensional shrinkage data of the blanks produced by powder injection molding meets the precision requirements for part manufacturing. Metallographic analysis reveals the presence of certain internal voids in the test specimens. The tensile strength of blank specimens prepared at different positions in the sintering furnace exhibits a certain correlation with their locations within the furnace. The tensile strength at all positions is lower than the average value of the bar stock, with an average reduction of 21.7%. The elongation of the test specimens is generally lower than the average value of the bar. The structural strength and initiation performance of the assembled finished products meet the design requirements and fall within the historical range. Therefore, powder metallurgy injection molding technology possesses the basic conditions for application in initiating explosive devices.