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The effects of the oxygen-enriched surface layer on mechanical properties of alpha+beta type titanium alloys

机译：富氧表面层对α+β型钛合金力学性能的影响

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The effects of heat treating conditions on thickness of the oxygen-enriched layer or alpha-case in Ti-4.5 percent Al-3 percent V-2 percent Fe-2 percent Mo alloy were studied in comparison with Ti-6 percent AL-4 percent V alloy, and then the effects of these layers on the mechanical properties were investigated. The higher heating temperature and an extended heating time increased oxygen-enriched layer or a-case thickness in Ti-4.5 percent Al-3 percent V-2 percent Fe-2 percent Mo alloy, and atmospheric heating using high purity argon gas with 99.999 percent purity could not prevent formation of the oxygen-enriched layer even by heating at such a low temperature as 998 K. The 30 mu m thick oxygen-enriched layer without a-case was formed by heat treating at 1 048 K for 3.6 ks in use of 99.9 percent purity argon gas which corresponded to the typical heating conditions adopted in a practical superplastic forming (SPF) operation using Ti-4.5 percent AL-3 percent V-2 percent Fe-2 percent Mo alloy. The thickness of both surface layers in Ti-6 percent AL-4 percent V alloy was much thicker than Ti-4.5 percent AL-3 percent V-2 percent Fe-2 percent Mo alloy because of its higher heating temperature. Tensile elongation, fatigue strength and bendability were deteriorated with the increase of oxygen-enriched layer or a-case thickness, and removal of these layers by pickling treatment fully recovered these properties to an original level. Deterioration of the mechanical properties was exerted by existence of the surface layer with high hardness, and in particular, the oxygen-enriched layer with a-case decreased fatigue strength more pronouncedly compared with the surface layer without a-case. Existence of brittle surface layer with high hardness and the coarse grain size in a-case appeared to be responsible for accelerated formation of microcrack at the surface of the mechanical testing specimens, resulting in deterioration of various properties.
机译：与Ti-6％AL-4％相比，研究了热处理条件对Ti-4.5％Al-3％V-2％Fe-2％Mo-2％Mo合金中富氧层或α-壳层厚度的影响。 V合金，然后研究这些层对机械性能的影响。较高的加热温度和较长的加热时间增加了Ti-4.5％Al-3％V-2％Fe-2％Mo-2合金中的富氧层或a壳的厚度，并使用99.999％的高纯氩气进行常温加热即使通过在998 K这样的低温下加热，纯度也无法防止形成富氧层。30毫米厚的无外壳的富氧层是通过在1048 K下热处理3.6 ks形成的纯度为99.9％的氩气，与使用Ti-4.5％AL-3％V-2％Fe-2％Mo合金的实际超塑性成形（SPF）操作中采用的典型加热条件相对应。 Ti-6％AL-4％V合金的两个表面层的厚度比Ti-4.5％AL-3％V-2％Fe-2％Mo合金要厚得多，因为它的加热温度更高。随着富氧层或a-壳层厚度的增加，拉伸伸长率，疲劳强度和弯曲性劣化，并且通过酸洗处理去除这些层将这些性能完全恢复到原始水平。由于存在高硬度的表面层而导致机械性能的劣化，特别是，与a-case相比，具有a-case的富氧层降低了疲劳强度。在某种情况下，存在具有高硬度和较粗晶粒尺寸的脆性表层，这是导致在机械测试样品表面加速形成微裂纹的原因，从而导致各种性能的下降。

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