Study of the Crack Initiation Mechanism and Suppression Methods in Laser Additive Manufacturing

Author of the article: LIU Guan, ZHAOKai, LIU Defu, LIN Yongcheng

Author's Workplace：School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China

Key Words： laser additive manufacturing; crack initiation; crack suppression method; precision manufacturing

Abstract： Laser additive manufacturing is an advanced manufacturing technology that constructs objects layer by layer through laser melting or sintering materials. Despite their significant advantages, such as the ability to manufacture components with complex geometric shapes and high material utilization rates, cracking issues remain a critical factor affecting their performance and engineering applications. This paper reviews the types of cracks in laser additive manufacturing, their initiation mechanisms, and methods for crack suppression. It analyses and explores the development trends of producing crack-free products in laser additive manufacturing from aspects such as process parameter optimization, beam shaping, and material modification. This study highlights that the application of laser additive manufacturing in the production of precision medical implants may be an important development direction in this field. Key words： laser additive manufacturing; crack initiation; crack suppression method; precision manufacturing