Production of complex geometries made of particle reinforced steel materials by powder compaction and subsequent thixoforging

在第一个项目阶段，所提供的颗粒增强钢材料模型组件生产工艺链可以通过粉末压制和随后的触变锻造来实现。为此，通过粉末冶金工艺生产了具有和不具有增强颗粒（碳化钛粉末）的圆柱形半成品。确定了取决于增强相的压制和烧结的具体材料因素。通过感应加热过程，半成品被加热到触变温度范围，从而可以检测到零件的足够尺寸稳定性。触变锻造过程也表明，通过确定锻造参数，可以实现所选几何形状的模具的完全填充。此外，还通过显微照片、硬度测量和拉伸试验对所生产的构件进行了表征。根据第二阶段项目的描述结果，触变锻造构件的复杂性应显著增加。利用半成品的生产和加热的结果，应该通过颗粒增强钢材料的触变锻造来制造两个非常复杂的部件几何形状。此外，粉末冶金的特定优点应用于部分颗粒增强的半成品的生产。通过这种方式，可以制造具有适应的材料特性的复杂部件，其可以更好地抵抗使用中的现有应力分布。所提供的工艺链的一个重要目的是使感应加热工艺以及成形工艺适用于部分颗粒增强的半成品。

Within the first project phase the provided process chain for the production of model components made of particle reinforced steel materials could be realized by powder pressing with subsequent thixoforging. For this purpose, cylindrical semi-finished products with and without reinforcement particles (titanium carbide powder) were produced by powder metallurgical processes. The specific material factors for pressing and sintering depending on the reinforcement phase were identified. By means of the inductive heating process the semi-finished products were heated up to the thixotropic temperature range, whereby a sufficient dimensional stability of parts could be detected. The thixoforging process also has shown that a complete filling of the mold for the selected geometry could be achieved by the determined of the forging parameters. In addition, the produced compo-nents were characterized by micrographs, hardness measurements and tensile tests.Based on the described results in the second project phase the complexity of the thixoforged com-ponents should be significantly increased. Using the results of the production and heating of the semi-finished products two very complex component geometries should be manufactured by thixoforging of particle reinforced steel materials. In addition, the specific advantages of powder metallurgy should be used for the production of semi-finished products with partial particle reinforcement. This way, complex components with adapted material properties can be manufactured, which can better resist an existing stress profile in use. An important aim of the provided process chain is to adapt the inductive heating process as well as the forming process on the partially particle reinforced semi-finished products.