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首页> 外文会议>Researches in Powder Metallurgy >Behaviour of Some Unalloyed and Alloyed Sintered Steels at Static and Dynamic Loads
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Behaviour of Some Unalloyed and Alloyed Sintered Steels at Static and Dynamic Loads

机译：某些非合金和合金烧结钢在静态和动态载荷下的行为

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摘要

The behaviour of alloyed and unalloyed sintered steels in static and dynamic loading is influenced by their macro and microstructure. The characteristics of the used powder, their chemical composition, the conditions of shaping by pressing, and the parameters of the sintering process are some factors determining the structure of the steels [1,2]. Under the same technological conditions, sintered materials were produced using iron powder of different particle size or in different powder mixtures for establishing the structure influence on some mechanical properties, The results obtained shows that the sintered materials present a higher sensitivity towards the dynamic and variable loads [2]. In the same time, it was shown that a material made from a fine powder fraction behaves, at mechanical loads, almost in the same way as an elaborated material from the same powder but with a wider particle size distribution or particles size. Using of the different powder mixtures lead to some microstructures with better mechanical properties at the intergranulars necks. Using the copper powder or the low or high alloyed iron powder in a mixture with the basic iron powder determines an improvement of the mechanical properties by changing the materials microstructure. It was found that the addition of high alloyed steel powder has the strongest effect on the fatigue resistance.
机译：合金和非合金烧结钢在静态和动态载荷下的性能受其宏观和微观结构的影响。所用粉末的特性，其化学成分，压制成形的条件以及烧结工艺的参数是决定钢结构的一些因素[1,2]。在相同的工艺条件下，使用不同粒径或不同粉末混合物的铁粉生产烧结材料，以确定其结构对某些机械性能的影响，所得结果表明，烧结材料对动态和可变载荷具有较高的敏感性。 [2]。同时，显示了由细粉部分制成的材料在机械载荷下的行为几乎与由相同粉末制成的精制材料的行为相同，但是具有更宽的粒度分布或粒度。使用不同的粉末混合物会导致一些微结构在晶间颈处具有更好的机械性能。通过将铜粉或低合金或高合金铁粉与碱性铁粉混合使用，可以通过改变材料的微观结构来提高机械性能。结果发现，添加高合金钢粉对疲劳强度的影响最大。

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