Structure and properties of titanium, alloyed by oxygen
Електронний архів E-archive DonNTU – (Electronic archive Donetsk National Technical University)
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| Title |
Structure and properties of titanium, alloyed by oxygen
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| Creator |
Snizhko, O. A.
Ratiev, S.M. Leoha, F.L |
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| Subject |
oxygen content
Microstructure of the metal Distribution of hardness on the radius of ingots Titanium sponge Argon Parameters of remelting |
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| Description |
It is shown that hardness of the metal increases with increasing of the contents of oxygen. So, the maximal hardness is typical for samples with contents of the oxygen 0.27%wt., but minimal - for sample with contents of the oxygen 0.035%wt. At the same time, in radial direction the hardness remains approximately constant that is indicative of uniform distribution of admixtures on horizontal section of ingot. The oxygen in titanium noticeably influences on the metal structure formation. So, for titanium with contents of the oxygen within from 0.053 to 0.110% coarse dendritic structure is typical, in which differences between separate area are revealed under small magnifications. Dendritic area etch evenly without clearly marked substructure. In some cases inside the dendritic areas weakly marked plate substructure is observed, typical to technically clean titanium in cast condition. Increasing of the contents of the oxygen to 0.2% and above provides the forming of structure of the shear transformation, which promote the growth strength properties. The formation of such structures in cast titanium possible to explain increasing of the contents of the oxygen, which influence on kinetics of the phase polymorphic transformation in metal during cooling. The results of the study of the structure and measurements of hardness have shown that ChESR provides good chemical and structural homogeneity of titanium ingots, alloyed by oxygen In this work the possibility of using of the gaseous oxygen as alloying component in process of chamber electroslag remelting (ChESR) of titanium sponge is considered. The oxygen is concerned to list of main admixtures of technically clean titanium, which provide the essential influence on its properties. However in contrast to nitrogen and hydrogen it renders not only negative, but also positive influence on titanium properties. Increase the contents of the oxygen brings about increasing of strength, hardness but reduction of the plasticity of titanium. Controlling its contents in metal in determined degree, it is possible to reach the optimum correlation between the plastic and strengthening characteristic of the titanium alloy. The oxygen it is possible to consider as perspective alloying element to obtain new titanium alloy. This is particularly important for medical product, for which along with mechanical properties on the first plan go out corrosion stability and biocompatibility. In contrast to other alloying component (for instance, vanadium), the oxygen is more safe. The most economic expedient it is using the gaseous oxygen for alloying of titanium. In this work the titanium samples with content of the oxygen from 0.035 to 0.27% were investigated, which got by alloying by oxygen directly from gas phase in process of chamber electroslag remelting of titanium sponge. Donetsk National Technical University, Department of Electrometallurgy |
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| Date |
2012-03-03T11:09:31Z
2012-03-03T11:09:31Z 2011 |
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| Type |
Article
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| Identifier |
Proceeding of the International Workshop on Metal-Slag Interactions0)/ September 14 to 19 in Yalta, Crimea, Ukraine, Shaker Verlag, Aachen, 2011. – P. 175 - 188
978-3-8440-0481-6 http://ea.donntu.edu.ua/handle/123456789/6719 |
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| Language |
en_US
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| Publisher |
Shaker Verlag, Aachen
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