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首页> 外文期刊>Materials Science and Engineering >Influence of surface quality and porosity on fatigue behaviour of Ti-6Al-4V components processed by MIM
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Influence of surface quality and porosity on fatigue behaviour of Ti-6Al-4V components processed by MIM

机译：表面质量和孔隙率对MIM处理的Ti-6Al-4V零件疲劳性能的影响

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摘要

Fatigue and tensile mechanical properties of Ti-6Al-4V alloy processed by metal injection moulding (MIM) technology were evaluated in this investigation. Two critical parameters, binder content of the feedstock and maximum sintering temperature, were studied. Samples sintered at 1350 ℃ exhibited higher tensile strength than those sintered at 125℃. Higher content of binder promoted an increase of the surface quality of MIM components. Consequently, the fatigue endurance limit increased from ～350 MPa (components with lower binder content) to ～400 MPa (samples with a higher binder content). Furthermore, reduction of ductility was observed for changing from closed to open porosity; however, the fatigue resistance did not follow the same trend. This is probably due to the fact that better surface quality and smaller grain size compensated the negative influence of porosity on the fatigue behaviour.
机译：在这项研究中评估了通过金属注射成型（MIM）技术处理的Ti-6Al-4V合金的疲劳和拉伸力学性能。研究了两个关键参数，即原料中的粘合剂含量和最高烧结温度。在1350℃下烧结的样品比在125℃下烧结的样品具有更高的拉伸强度。粘合剂含量的提高促进了MIM组件表面质量的提高。因此，疲劳强度极限从〜350 MPa（粘合剂含量较低的组分）增加到〜400 MPa（粘合剂含量较高的样品）。此外，观察到从封闭孔隙到开放孔隙的延展性降低。但是，抗疲劳性没有遵循相同的趋势。这可能是由于以下事实：更好的表面质量和更小的晶粒尺寸弥补了孔隙度对疲劳行为的负面影响。

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