Development of Three-dimensional Characterizations and Electro-pulse Repairing Technology for Forming Defects within Ti Component by Laser Additive Manufacturing
Additive manufacturing technology has the advantages of large design freedom,no need for dies,and near net form-ing,so the technology has broad application prospects in aerospace,ocean engineering,petroleum engineering and other fields.However,due to the low heat conductivity and limitation of mold-filling capacity of high-strength alloys such as titanium alloys,their laser-formed components are prone to form defects such as pores,hot cracks,and cold cracks,which will reduce their mechanical properties.Recently,in order to dig out the micro-mechanism of forming defects,researchers have introduced sev-eral characterizing methods for analyzing the defects.In addition,on the basis of the results from the defects characterizations,technologies have been generated for repairing defects.In this article,we summarize the development of non-damaged three-di-mensional characterizing technologies for forming defects,as well as the non-damaged defects repairing technologies.In the end,we also indicate the prospect of defects analysis and reparation for the components by laser additive manufacturing.
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