Abstract
Additive manufacturing of ZK60 alloy by laser powder bed fusion (LPBF) has promising prospect for light-weight structures and biodegradable implants. Though hot cracking of ZK60 has been widely reported during welding processes, it is surprisingly that no literature so far mentioned it during the LPBF. This paper identified serious solidification and liquation cracking in ZK60 LPBF samples. Low-melting eutectic precipitation was characterized as Mg7Zn3 along the cracks. Ruptured by thermal stress, solidification cracking occurred in the depositing layers due to the wide solidification range, while liquation cracking occurred in the deposited layers due to repeated heating. The two types of cracks merged into a connected network, which hugely deteriorated the relative density of LPBF samples.
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