Abstract
Laser powder bed fusion (LPBF) is one of the most prospective metal additive manufacturing techniques and has significant advantages over traditional subtractive manufacturing. The potential use of LPBF manufactured aluminum parts as structural materials has attracted much attention. However, there are still challenging issues to be resolved. Solidification cracking is one serious issue which deteriorates the performance of LPBF components. Recent research and progress on solidification cracks of LPBF manufactured aluminum alloys are reviewed in this article. The mechanisms of solidification crack formation are discussed. Special attention is paid to the methodologies of crack inhibition, including optimization of process parameters, narrowing down the solidification freezing range, and grain refinement. Concluding remarks and an outlook are given in the final section.
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