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| Investigation of Microstructure and Tensile Properties of TC17 Alloy Fabricated by Electron Beam Wire Deposition |
| YANG Yang, WU Fan, CHEN Wei |
| (Science and Technology on Power Beam Processes Laboratory, AVIC Manufacturing Technology Institute, Beijing 100024, China) |
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Abstract The microstructure and tensile properties of TC17 alloy fabricated by electron beam wire deposition (EBWD) were investigated. The as-built EBWD TC17 alloy exhibited a homogeneous element distribution, and the coarse columnar β grains grew epitaxially through many deposited layers along the z direction. Inside each columnar grain there was fine basket-waved microstructure. After hot isostatic pressing (HIP), small α rods formed in the β matrix. In the solution treated and aged material, rod-like α phase and fine α precipitates both existed. The tensile strength and elongation of as-built EBWD TC17 alloy were 935MPa and 9.0%, respectively. The tensile strength and elongation after HIP were 904MPa and 18.0%. After solution treating and aging, the tensile strength increased 18% (to 1066MPa) compare with the HIP condition due to the strengthening effect of fine α precipitates. However, the elongation decreased significantly (to 7.5%) and the ductile dimples on the tensile fracture surface also decreased.
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2020, 
