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Porosity Effects in Low Pressure Carburizing of Sintered Steels

机译：烧结钢低压渗碳中的孔隙效应

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Especially for automotive parts, for engine and transmission applications, extremely good properties in terms of fatigue and wear are required. This is a difficult task for PM parts which usually contain a significant amount of retained porosity.rnTherefore for gears a special method was developed to densify the critically-loaded areas which are the gear teeth after sintering; with the help of this process step almost full density is achieved in the critical areas (Figure 1). This increases the level of the tooth fillet strength as well as the resistance to fretting fatigue to levels similar to conventional wrought materials, however with lower mass due to the porosity in the base body [1,2].
机译：特别是对于汽车零件，发动机和变速箱应用，在疲劳和磨损方面需要极好的性能。对于通常含有大量保留孔隙的PM零件而言，这是一项艰巨的任务。因此，对于齿轮，开发了一种特殊的方法来致密化烧结后的齿轮的临界载荷区域，即齿轮。借助这一工艺步骤，关键区域几乎达到了全密度（图1）。这样可以将齿角强度水平提高，并将对微动疲劳的抵抗力提高到与常规锻造材料相似的水平，但是由于基体中的孔隙率，质量降低了[1,2]。

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