Towards β-fleck defect free additively manufactured titanium alloys by promoting the columnar to equiaxed transition and grain refinement
Source abstract
Abstract
Metastable β-Titanium alloys containing a high content of segregated β-stabilising elements such as Cr make segregation defects (known as β-flecks or β-freckles) difficult to avoid during solidification processing. This work investigates the formation of β-flecks in the high strength Ti-3Al-8V-6Cr-4Mo-4Zr (Beta-C/ASTM Grade 19) produced by Wire Arc Additive Manufacturing and explores whether the introduction of grain refiner (LaO) to the alloy can prevent the segregation defects from forming. Promoting the columnar to equiaxed transition and refining the grain size with LaO nucleant particles was found to significantly reduce the presence of β-flecks by 99.9% compared to the un-refined (standard) alloy. Analytical and numerical modelling is used to provide insights into how grain refinement can achieve this significant defect reduction.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Additive Manufacturing Materials and Processes · Titanium Alloys Microstructure and Properties · Intermetallics and Advanced Alloy Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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