论文部分内容阅读
本工作的目的在于研究不同成型工艺对粉末高温合金FGH95组织和性能的影响,以确定合适的成型工艺。采用了氩气雾化的FGH95合金粉,用热等静压(HIP)、及其加锻造和热挤压三种工艺使之致密化。对各种压坯的显微组织和机械性能进行了研究。扫描电镜和透射电镜的研究结果说明,经过锻造或挤压的合金,其显微组织有明显的改善。热等静压合金的断口是沿粉末颗粒间断裂的,这是由于显微组织中存在着原始颗粒边界(PPB),降低了合金的力学性能。在热等静压加锻造或热挤压的合金中,由于消除了原始颗粒边界,断口是穿晶断裂的,因而改善了合金的强度和塑性。采用热挤压或热等静压加锻造成型工艺比较有效。
The purpose of this work is to study the effects of different forming processes on the microstructure and properties of FGH95 powder superalloy to determine the proper forming process. Using argon atomized FGH95 alloy powder, with hot isostatic pressing (HIP), and its plus forging and hot extrusion of three processes to densification. The microstructure and mechanical properties of various compacts were studied. Scanning electron microscopy and transmission electron microscopy results show that after forging or extrusion of the alloy, the microstructure has significantly improved. The fracture of the hot isostatic pressing alloy breaks along the powder particles due to the presence of primary particle boundaries (PPB) in the microstructure, which reduces the mechanical properties of the alloy. In hot isostatic pressing plus forged or hot extruded alloys, the strength and ductility of the alloy are improved due to the elimination of the primary particle boundaries, the fracture being transgranular. Hot extrusion or hot isostatic pressing plus forging molding process more effective.