Process-oriented modeling and simulation of unsteady modulated gas flows in plasma powder cladding to influence layer properties

等离子粉末熔覆中影响层性能的非稳态调制气流的面向过程的建模和仿真

• 批准号: 321752493
• 负责人: Professor Dr.-Ing. Peter Mayr
• 金额: --
• 依托单位: Fakultät für Maschinenbau
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/321752493?language=en
• 关键词: Process; oriented; modeling; simulation; unsteady

The objective of this research project is to develop an approach to identify and characterize the effects of time-varying non-stationary modulated process gas streams on the melt reaction during plasma cladding with regards to oscillation and current. It is expected that an improvement in the mechanical properties can be achieved with a favorable distribution of hard particles and through refinement of the microstructure. Two alloys will be introduced as hard material powder to the plasma arc during this investigation. The two alloys are a stellite cobalt alloy and a stellite alloy alongside tungsten carbides. The cobalt stellite powder will be altered by the weld pool solidification process such that dendritic growth is interrupted, in order to obtain a more fine-grained deposit. The goal for the stellite with the added tungsten carbides is to achieve an even distribution of tungsten carbides throughout the weld by agitating the weld pool to counteract gravity segregation of the tungsten carbides. The results of this investigation should make it possible to have a basic understanding of transient process gas streams in a PTA hardfacing process with regards to the resulting physical effects and to develop economic uses from this knowledge. This knowledge can then be used to enhance the wear properties of this process by changing the microstructure and macrostructures of these overlays, and furthermore be used to expand upon the current application boundaries.

该研究项目的目的是开发一种方法来识别和表征随时间变化的非平稳调制工艺气体对振荡和电流的等离子包层过程中熔体反应的影响。可以预期，通过硬粒子的有利分布和微观结构的细化，可以改善机械性能。在此研究期间，将将两种合金作为硬质粉末引入血浆弧。这两种合金是碳化碳纤维旁边的石材合金和石材合金。钴星粉将通过焊接池固化过程改变，使树突状的生长被中断，以获得更细粒度的沉积物。用添加的碳化碳纤维添加的标准岩的目标是通过搅动焊接池来抵消钨碳纤维的重力分离，以实现整个焊缝的均匀分布。这项调查的结果应该使得在PTA硬化过程中对瞬态过程的基本了解，就产生的物理效果而言，并从这些知识中发展经济用途。然后，可以通过更改这些覆盖物的微结构和宏观结构来使用这些知识来增强此过程的磨损特性，此外，还可以用于扩展当前的应用程序边界。