Nanocluster formation in oxide-dispersion strengthened steels by internal oxidation subsequent to ultrasonic powder atomization

超声粉末雾化后通过内部氧化在氧化物弥散强化钢中形成纳米团簇

• 批准号: 462420328
• 负责人: Professor Dr.-Ing. Martin Heilmaier
• 金额: --
• 依托单位: Institut für Angewandte Materialien - Werkstoffkunde (IAM-WK)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/462420328?language=en
• 关键词: Nanocluster; formation; oxide; dispersion; strengthened

The proposed project deals with the fundamental issue in processing oxide dispersion strengthened steels of how oxide nanoclusters form from the severely deformed microstructure subsequent to mechanical alloying. In this project, we utilize ultrasonic metal powder atomization for this purpose, which allows the preparation of metal powders lean in interstitials. During ultrasonic metal powder atomization, the raw material is melted in an arc melter the crucible of which is attached to an ultrasonic sonotrode. The vibrations of the sonotrode lead to tear off of molten particles and rapid solidification to spherical particles with narrow size distribution occurs. The use of arc melting and low gas flow allows for achieving very low interstitial contents. These are below or in the order of the oxygen contents needed to form oxide nanoclusters whereas in mechanical alloyed steels a tremendous oxygen excess exists which makes the analysis of the solved oxygen content and precipitation state of the oxides difficult. After atomization, the nanoclusters are formed via internal oxidation. During the project, the chemical composition, the microstructure and the mechanical properties are determined throughout the entire processing chain. This includes an evaluation of oxide particle size and density, dislocation density and grain size by scale-bridging characterization techniques. This allows for an assessment of the precipitation sequences during the processing steps and its influence on the mechanical behavior of the materials.

拟议的项目涉及处理氧化物分散剂的基本问题，增强了氧化物纳米簇如何从机械合金后严重变形的微观结构中形成的钢。在这个项目中，我们为此目的利用超声金属粉状雾化，这使金属粉末的制备倾斜在间隙中。在超声金属粉末雾化过程中，将原料融化在弧熔化的坩埚中，其坩埚附着在超声波超声波德上。超声的振动导致熔融颗粒的撕裂，并快速凝固到具有狭窄尺寸分布的球形颗粒上。使用电弧熔化和低气流可以实现非常低的间隙内容物。这些位于形成氧化物纳米簇所需的氧含量下方或按顺序，而在机械合金钢中存在巨大的氧气过量，这使得对氧化物的氧气含量和降水状态的分析变得困难。雾化后，纳米簇是通过内部氧化形成的。在项目期间，在整个加工链中确定化学组成，微结构和机械性能。这包括评估氧化物粒度和密度，脱位密度和晶粒尺寸，按尺度桥接特征技术进行评估。这允许在处理步骤中评估降水序列及其对材料机械行为的影响。