English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We investigate the hot cracking susceptibility and creep resistance of threeversions of a nickel-based superalloy with different contents of boron, carbonand zirconium fabricated by laser powder bed fusion. Crack-free and creepresistant components are achieved for alloys with boron, carbon and nozirconium. We then rationalize this result by evaluating how boron, carbon andzirconium are distributed at grain boundaries in the as-built and heat-treatedmicrostructures of an alloy containing all these elements. Observations areconducted by scanning and transmission electron microscopy, and atom probetomography. In the as-built microstructure, boron, carbon and zirconiumsegregate at high-angle grain boundaries as a result of solute partitioning tothe liquid and limited solid-state diffusion during solidification and cooling.After heat-treatment, the amount of boron and carbon segregating at grainboundaries increases significantly. In contrast, zirconium is not found atgrain boundaries but it partitions at the gamma' precipitates formed during theheat treatment. The presence of zirconium at grain boundaries in the as-builtcondition is known to be susceptible to enhance hot cracking, while its absencein the heat-treated microstructure strongly suggests that this element has nomajor effect on the creep resistance. Based on our observations, we proposealloy design guidelines to at the same time avoid hot cracking duringfabrication and achieve the required creep performance after heat-treatment.

On the role of boron, carbon and zirconium on hot cracking and creep resistance of additively manufactured polycrystalline superalloys