Fig. 1—Single line build consisting of 18 layers of Ti-6Al-4V lar deposited onto a substrate of the same material. Lar motion is in the ϩx direction and layers are added in the ϩz direction.paint怎么读
Table II.Summary of As-Deposited Measurements
常用的英语口语
Average ϮFig. 2—As-received profile of a Ti-6Al-4V lar deposit showing the colum-nar prior beta grains and layer band morphology.
Fig. 3—Nominal microstructure of the lar deposit consisting of bas-ketweave Widmanstätten ␣grains outlined in retained .
Fig. 4—Layer band morphology consisting of colonies of Widmanstätten ␣grains outlined in retained .
four layers that have been deposited indicates that the micro-structure changes from a fine basketweave morphology (L16) to a fine colony alpha structure (L18). The alpha-lath width in the fine colonies was less than 1tative micrographs from L16 through L18 can be obrved Vickers hardness measurements were employed to determine if the layer-band microstructure results in a difference in mechanical properties. The results are shown II for macro and microhardness measurements
empty什么意思Fig. 5—Macrograph of the last five layers to be deposited illustrating the
lack of layer bands in the last three layers deposited. The morphology for
oil paintingregions exhibiting microstructural contrast is labeled.
grossprofit(a)(b)(c)
form是什么意思Fig. 6—Micrographs from the last three layers to be deposited. Regions from the middle of (a) L16 (nϩ1) showing fine basketweave and fine colony Widmanstätten alpha, (b) L17 (nϩ2) showing fine colonies of alpha with some areas of fine basketweave Widmanstätten alpha, and (c) L18 (nϩexhibiting predominantly fine colonies of alpha.
(a)
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(b)
Fig. 7—(a) Composition profile for the 8.1-mm-long traver that cross three layer bands. The positions of the layer bands, indicated by the dashed lines, are approximate. (b) Composition profile of the central 9.9-mm-long traver measured from L16 and L17 that does not cross any layer band.
The average composition in weight percent is (a) 90.54Ti, 5.58Al, and 2.83V and (b) 88.47Ti, 5.77Al, and 2.28V.
IV.DISCUSSIONgather
so disappointed>胜于无It was obrved that the prior-beta grains in the deposit are columnar in nature, oriented nearly perpendicular to the sub-strate in the y-z plane, and slightly tilted in the direction of lar motion in the x-z plane. The prior-beta grains also grow across multiple deposited layers. Initial solidification of the columnar grains occurs epitaxially from the grains in the ba metal, or previously deposited layers, due to similarities in the composition and surface energies of the metal. This allows for the columnar grains to continue growing across multiple layers. The aligned orientation of the prior-beta grains is
