The Use of Micromechanical Models in the Prediction of Microstructural Paths and Constitutive Parameters for the Densification of Powders

使用微观力学模型预测粉末致密化的微观结构路径和本构参数

• 批准号: 9700062
• 负责人: Ian Nettleship
• 金额: $ 18万
• 依托单位: University of Pittsburgh
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-05-15 至 2001-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9700062&HistoricalAwards=false
• 关键词: Use; Micromechanical; Models; Prediction; Microstructural

Nettleship The project develops micromechanical models based on the densification of an alumina powder and an Inconel N625 superalloy powder to predict the path of microstructural changes occurring during densification. The effects of some processing variables on the microstructure and constitutive parameters that would be needed for the continuum mechanics models are also being studies. Earlier models have not performed well due to the lack of accurate values for kinetic information such as diffusion coefficients as well as due to not including the internal structure of the powder particles into micromechanical models. The factors are taken into account and experimental verification of the model is performed. ***

Nettleship 该项目开发基于氧化铝粉末和 Inconel N625 高温合金粉末致密化的微机械模型，以预测致密化过程中发生的微观结构变化的路径。 一些加工变量对连续介质力学模型所需的微观结构和本构参数的影响也在研究中。 早期的模型由于缺乏扩散系数等动力学信息的准确值以及未将粉末颗粒的内部结构纳入微机械模型而表现不佳。 考虑这些因素并对模型进行实验验证。 ***