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首页> 外文期刊>JOM >Fatigue Performance of Powder Metallurgy (PM) Ti-6Al-4V Alloy: A Critical Analysis of Current Fatigue Data and Metallurgical Approaches for Improving Fatigue Strength
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Fatigue Performance of Powder Metallurgy (PM) Ti-6Al-4V Alloy: A Critical Analysis of Current Fatigue Data and Metallurgical Approaches for Improving Fatigue Strength

机译：粉末冶金Ti-6Al-4V合金的疲劳性能：当前疲劳数据的临界分析和提高疲劳强度的冶金方法

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摘要

A comprehensive assessment of fatigue performance of powder metallurgy (PM) Ti-6Al-4V alloy, manufactured using various powder-based processing approaches to-date, is performed in this work. The focus is on PM processes that use either blended element (BE) or pre-alloyed (PA) powder as feedstock. Porosity and the microstructure condition have been found to be the two most dominant material variables that control the fatigue strength. The evaluation reveals that the fatigue performance of PM Ti-6Al-4V, in the as-sintered state, is far lower than that in the wrought condition. This is largely caused by residual porosity, even if it is present in small amounts, or, by the coarse lamellar colony microstructure. The fatigue strength is significantly improved by the closure of pores, and it approaches the levels of wrought Ti-6Al-4V alloys, after hot-isostatic-pressing (HIPing). Further thermo-mechanical and heat treatments lead to additional increases in fatigue strength-in one case, a high fatigue strength level, exceeding that of the mill-annealed condition, was achieved. The work identifies the powder, process and microstructure improvements that are necessary for achieving high fatigue strength in powder metallurgical Ti-6Al-4V alloys in order for them to effectively compete with wrought forms. The present findings, gathered from the traditional titanium powder metallurgy, are also directly applicable to additively manufactured titanium, because of the similarities in pores, defects, and microstructures between the two manufacturing processes.
机译：在这项工作中，进行了粉末冶金（PM）Ti-6Al-4V合金的疲劳性能的综合评估，该合金迄今已使用各种基于粉末的加工方法制造。重点是使用混合元素（BE）或预合金（PA）粉末作为原料的PM工艺。已经发现孔隙率和微观结构条件是控制疲劳强度的两个最主要的材料变量。该评估表明，在烧结状态下，PM Ti-6Al-4V的疲劳性能远低于在锻造状态下的疲劳性能。这主要是由于残余孔隙（即使少量存在）或粗糙的层状菌落微结构引起的。通过气孔的封闭，疲劳强度得到了显着改善，经过热等静压（HIPing）后，它达到了锻制Ti-6Al-4V合金的水平。进一步的热机械和热处理导致疲劳强度进一步增加-在一种情况下，获得了超过轧机退火条件的高疲劳强度水平。这项工作确定了粉末，工艺和显微组织的改进，这对于在粉末冶金Ti-6Al-4V合金中实现高疲劳强度是必不可少的，以便使它们与锻造形式有效竞争。由于两种制造工艺之间的孔，缺陷和微观结构的相似性，从传统的钛粉末冶金学中收集到的本发现也可直接应用于增材制造的钛。

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