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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2021.1
- 수록면
- 78 - 91 (14page)
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초록· 키워드
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The crack formation mechanisms of Ti–48Al–2Cr–2Nb single tracks processed by laser powder bed fusion were extensivelyinvestigated in a wide range of laser powers and scan speeds. The crack patterns were categorized by their directionalities,which were parallel (longitudinal crack) and/or perpendicular (transverse crack) to the scan direction. For the representativeprocess conditions of the keyhole, transition, and conduction modes, cracking behaviors were characterized by combiningthe fractography and the microstructural analysis. Further, thermal-mechanical finite element method simulations wereperformed to predict the distribution of temperatures and thermal stresses during the melt pool formation. On the basis ofthe combined results, the cracks formed in keyhole, transition, and conduction modes were clarified as a solidification crackand/or a thermal crack. In addition, the formation of these cracks was thoroughly understood in terms of thermal stresses andmicrostructural factors that affect the crack susceptibility. Finally, comprehensive mechanisms responsible for cracking ofTi–48Al–2Cr–2Nb single tracks under laser powder bed fusion were proposed for different process conditions (the keyhole,transition and conduction modes).
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