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首页> 外文期刊>Journal of Materials Engineering and Performance >Development of Novel Pre-alloyed PM Steels for Optimization of Machinability and Fatigue Resistance of PM Components
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Development of Novel Pre-alloyed PM Steels for Optimization of Machinability and Fatigue Resistance of PM Components

机译：新型可优化PM零件的可加工性和抗疲劳性的预合金PM钢的开发

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It is well known that a large proportion of ferrous PM components require secondary machining operations for dimensional conformance or for producing geometrical features that cannot be generated during die compaction. Nevertheless, the machining behavior of PM parts is generally characterized as being "difficult" due to the presence of residual porosity that lowers thermal conductivity and induces interrupted cutting. Several admixed additives such as MnS and BN-h can be used to improve the machining behavior of PM steels. Nevertheless, their negative effect on mechanical properties, especially fatigue resistance, makes their utilization uninteresting for the fabrication of high-performance PM steel components. This article summarizes the work carried out to develop a novel PM steel that was especially engineered to form machinability enhancing precipitates. This new material is pre-alloyed with tin (Sn) in order to form Cu-Sn (Cu(alpha)) precipitates during transient liquid phase sintering. The newly developed material presents machinability improvement of 165% compared to reference material used in the PM industry as well as increases in toughness and fatigue resistance of 100% and 13%, respectively.
机译：众所周知，大量的黑色金属PM组件需要二次加工操作，以实现尺寸一致性或产生在压模过程中无法生成的几何特征。然而，由于存在残余孔隙率，PM零件的加工行为通常被描述为“困难”，这会降低导热率并导致切削中断。几种混合添加剂，如MnS和BN-h可用于改善PM钢的加工性能。然而，它们对机械性能，特别是抗疲劳性的负面影响，使其在制造高性能PM钢构件时无用。本文总结了开发新型PM钢所进行的工作，该PM钢经过特殊设计可形成可切削性增强的沉淀物。为了在瞬态液相烧结过程中形成Cu-Sn（Cuα）沉淀物，将这种新材料与锡（Sn）预合金化。与PM行业中使用的参考材料相比，新开发的材料可切削性提高了165％，韧性和抗疲劳性分别提高了100％和13％。

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