Boron-induced microstructural manipulation of titanium and titanium alloys in additive manufacturing

被引:17
作者
Sola, A. [1 ]
Trinchi, A. [1 ]
机构
[1] CSIRO, Mfg Business Unit, Adv Mat & Proc, Melbourne, Vic, Australia
关键词
Boron; titanium; additive manufacturing; grain refinement; columnar growth; TI-TIB COMPOSITE; IN-SITU; GRAIN-REFINEMENT; MECHANICAL-PROPERTIES; MATRIX COMPOSITES; LASER DEPOSITION; DENSIFICATION BEHAVIOR; METALLIC COMPONENTS; WEAR PERFORMANCE; EQUIAXED ALPHA;
D O I
10.1080/17452759.2023.2230467
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
While the role of boron (B) has been thoroughly clarified in titanium (Ti) castings, the microstructural changes triggered in additive manufacturing (AM) are still the subject of debate in the literature. Many contributions have confirmed the B-induced microstructural refinement in Ti-based AM parts. The formation of TiB in titanium matrix composites (TMCs) may increase strength. In some cases, B may also promote the columnar-to-equiaxed transition, thus mitigating the anisotropic effects associated with the strong epitaxial growth of unidirectional columnar grains typical of AM. However, as critically discussed in this review, some pitfalls remain. Due to fast cooling, the microstructural evolution in AM may deviate from equilibrium, leading to a shift of the Ti-B eutectic point and to the formation of out-of-equilibrium phases. Additionally, the growth of TiB may undermine the ductility and the crack propagation resistance of AM parts, which calls for appropriate remediation strategies.
引用
收藏
页数:41
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