Effects of Trace Boron Addition and Different Arc Types on Microstructure and Mechanical Properties of TC11/TC17 Dual Alloy Fabricated by Wire Arc Additive Manufacturing

Abstract

Wire arc additive manufacturing (WAAM) provides an efficient and low‐cost potential for manufacturing TC11/TC17 dual titanium alloy. In this work, six deposition samples were fabricated for the test of microstructure and mechanical properties by the combination of trace boron addition and different arc types (direct current (DC), high frequency pulsed current (HC), low frequency pulsed current (LC)). Results show that the epitaxial growth β columnar grains were formed except for the combination of low frequency pulsed current and trace boron addition (LCB). A special microstructure of coarser α phases surrounding thin α phases was formed by the effect of LC arc or trace boron addition. Some TiB particles exhibited a specific orientation relationship with surrounding α phases, but not all: (0001)α||(001)TiB and <11‐20>α||[010]TiB. About mechanical properties, the elongation decreased with trace boron addition, and comprehensive mechanical properties of LC method was better than that of DC or HC methods whether it contained trace boron or not, with tensile strength of 1057 MPa and elongation of 14.4% in the longitudinal direction. Meanwhile, the strength of LCB group is highest than that of other groups, which is caused by the refined β grains and the uniform distribution of TiB particles.

Short Circuiting Transfer, Formation, and Microstructure of Ti-6Al-4V Alloy by External Longitudinal Magnetic Field Hybrid Metal Inert Gas Welding Additive Manufacturing

“…However, the coarse microstructure and significant anisotropy was easily obtained in the titanium alloy arc plasma-based additive manufacturing part. Some researchers proposed additional nucleation particles to improve the titanium alloy part [ 9 , 10 , 11 ]. Zhuo et al [ 11 ] researched the influence of trace boron addition on microstructure and mechanical properties of TC11/TC17 in wire arc additive manufacturing.…”

“…Some researchers proposed additional nucleation particles to improve the titanium alloy part [ 9 , 10 , 11 ]. Zhuo et al [ 11 ] researched the influence of trace boron addition on microstructure and mechanical properties of TC11/TC17 in wire arc additive manufacturing. The results showed that the coarser α phases surrounding thin α phases were formed, and β grain size was refined obviously.…”