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首页> 外文会议>Advances in Powder Metallurgy Particulate Materials - 2006 >DETAILED LINKAGES OF POWDER CHARACTERISTICS TO PROPERTIES IN PRESS-SINTER PROCESSING OF POWDER METALS
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DETAILED LINKAGES OF POWDER CHARACTERISTICS TO PROPERTIES IN PRESS-SINTER PROCESSING OF POWDER METALS

机译：粉末特性与粉末金属烧结过程中性能的详细联系

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摘要

Discrete element analysis is used to map particle size distributions into measures of the pore size distribution after die filling up to sintering. A surprising outcome is the ability to map the pore size distribution as a means to link with fracture-based properties, from just the density and particle size distribution. Combinations evaluated using the technique include monosized powders, bimodal mixtures, and various log-normal distributions. The latter proves most relevant to press-sinter powder metallurgy by providing a mapping of the starting particle size distribution into property predictions. The results show the formation of large pores in die filling that need to be avoided to ensure high sintered properties. With this approach, insight is gained on those aspects of the initial particle size distribution that limit sintered properties. Hence, it is possible to anticipate property limits such as fatigue life or fracture toughness since large pores initiate fracture and provide a short-circuit failure path in fatigue. Recommendations are made for how particle size shifts are required to ensure the highest possible mechanical properties for less than full-dense press-sinter compacts.
机译：离散元素分析用于将粒度分布映射为填充模具直至烧结后孔径分布的度量。令人惊讶的结果是能够绘制孔径分布图，以作为仅基于密度和粒径分布图与基于裂缝的特性相关联的一种方法。使用该技术评估的组合包括单一尺寸的粉末，双峰混合物和各种对数正态分布。通过提供起始粒度分布到性能预测中的映射，后者证明与压烧结粉末冶金最相关。结果表明，在模具填充物中形成大孔是必须避免的，以确保高烧结性能。通过这种方法，可以了解限制烧结性能的初始粒度分布的各个方面。因此，由于大孔会引起断裂并在疲劳中提供短路故障路径，因此可以预期诸如疲劳寿命或断裂韧性​​之类的性能极限。提出了有关如何要求粒度变化的建议，以确保在低于全密度压制烧结体的情况下确保最高的机械性能。

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  • 会议地点 San DiegoCA(US)
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    Randall M. German;

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    CAVS Chair Professor of Mechanical Engineering Center for Advanced Vehicular Systems Mississippi State University P. O. Box 5405 Mississippi State MS 39762-5405;

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