Abstract
Ti6Al4V/Inconel718 functionally graded materials were fabricated by laser additive manufacturing technology. The composition, phase composition, microstructure and microhardness of the gradient materials were studied. The results show that a series of phase transitions occur along the composition gradient direction: α+β→β+Ti2Ni+TiCr2+Ti-Fe→β+TiNi+TiCr2+Ti-Fe→γ+Laves. The transition layer is mainly composed of binary phases including TiNi, Ti2Ni, Ti-Cr, Ti-Fe, etc; the microstructure from the bottom to the top of the material changes from the Widmanstätten α-laths structure to the equiaxed β structure, and then it is epitaxially grown from equiaxed β structure into fine dendritic structure. The results of microhardness test show that the increase of hardness is mainly related to the decrease of α phase volume fraction, the increase of β phase, Ti-Ni, Ti-Cr and Ti-Fe phase, solid solution hardening and grain refinement. The maximum value in this study is 8230 MPa.
| Translated title of the contribution | Compositional Changes and Microstructure Evolution of Ti6Al4V-Inconel718 Functionally Graded Materials by Laser Additive Manufacturing |
|---|---|
| Original language | Chinese (Traditional) |
| Pages (from-to) | 2813-2819 |
| Number of pages | 7 |
| Journal | Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering |
| Volume | 49 |
| Issue number | 8 |
| State | Published - 1 Aug 2020 |