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首页> 外文学位 >Development and evaluation of P/M processing techniques to improve and control the mechanical properties of metal injection molded parts.
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Development and evaluation of P/M processing techniques to improve and control the mechanical properties of metal injection molded parts.

机译：开发和评估P / M加工技术，以改善和控制金属注射成型零件的机械性能。

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摘要

Metal Injection Molding (MIM) is one of the most rapidly growing areas of powder metallurgy (P/M) but the growth of MIM into new markets and more demanding applications is limited by two fundamental barriers, the availability of low cost metal powders and a lack of knowledge and understanding of how mechanical properties, especially toughness, are affected by the many parameters in the MIM process. The goals of this study were to investigate solutions to these challenges for MIM.; Mechanical alloying (MA) is a technique which can produce a wide variety of powder compositions in a size range suited to MIM and in smaller batches. However MA typically suffers from low production volumes and long milling times. This study will show that a saucer mill can produce sizable volumes of MA powders in times typically less than an hour. The MA process was also used to produce powders of 17-4PH stainless steel and the NiTi shape memory alloy for a MIM feedstock. This study shows that the MA powder characteristics led to successful MIM processing of parts.; Previous studies have shown that the toughness of individual MIM parts can vary widely within a single production run and from one producer to another. In the last part of the study a Design of Experiments (DOE) approach was used to evaluate the effects of MIM processing parameters on the mechanical properties. Analysis of Variance produced mathematical models for Charpy impact toughness, hardness, density, and carbon content. Tensile properties did not produce a good model due to processing problems. The models and recommendations for improving both toughness and reproducibility of toughness are presented.
机译：金属注射成型（MIM）是粉末冶金（P / M）增长最快的领域之一，但MIM向新市场的增长和要求更高的应用受到两个基本障碍的限制，那就是低成本金属粉末的可获得性和缺乏对MIM过程中许多参数如何影响机械性能（尤其是韧性）的知识和了解。这项研究的目的是研究针对MIM的这些挑战的解决方案。机械合金化（MA）是一种技术，可以生产各种粉末组合物，其尺寸范围适合MIM，并且批量较小。然而，MA通常遭受产量低和研磨时间长的困扰。这项研究表明，碟磨机可以在不到一小时的时间内生产出相当数量的MA粉。 MA工艺还用于生产用于MIM原料的17-4PH不锈钢和NiTi形状记忆合金粉末。这项研究表明，MA粉末的特性导致成功地对零件进行MIM处理。先前的研究表明，单个MIM零件的韧性在一次生产过程中以及从一个生产商到另一个生产商之间的差异可能很大。在研究的最后一部分中，实验设计（DOE）方法用于评估MIM工艺参数对机械性能的影响。方差分析产生了夏比冲击韧性，硬度，密度和碳含量的数学模型。由于加工问题，拉伸性能不能产生好的模型。提出了用于提高韧性和再现性的模型和建议。

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  • 作者

    Sago, James Alan.;

  • 作者单位

    University of Missouri - Rolla.;

  • 授予单位 University of Missouri - Rolla.;
  • 学科 Engineering Metallurgy.; Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2004
  • 页码 135 p.
  • 总页数 135
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 冶金工业;工程材料学;
  • 关键词

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