激光选区熔化成形钛合金底座断裂分析

打开文本图片集

Fracture analysis of laser selective melting formingTi-6Al-4Vbase

JIANG Long， ZHANG Chaoqun，WANG Xuan， LU Xiaogang ChinaAirborneMissileAcademy，Luoyang471ooo，Henan，China

Abstract：The Ti-6Al-4V base formed by Selective Laser Melting （SLM） experienced fracture failure during the experimental proces.The fractured base was analyzed by macroscopic fracture inspection，scanning electron microscopy and energy spectrum analysis，chemical composition analysis，metallographic analysis，CT detection and other methods.The results showed that there were a large number of incomplete fusion defects inside the U-shaped groove of the Ti-6Al-4Vbase formed bySLM，which ledtoadecrease inthe load-bearing capacityof the area.Under the actionof instantaneous impact load inthe experiment，overload fracture occurrd.And put forward suggestions： First，Strengthen onlinequality monitoring during the printing proces，identify and analyze possible risk sources，and enhance processdetectionand qualitycontrol; Second，Toaddress the issueofundetected lackof fusiondefects in X-rayand fluorescence testing，it is recommended to add an industrial CTsampling proces after the original mechanical processing.

Keywords：selective laser melting;Ti-6Al-4V;unfused defects; overload fracture

1 序言

Ti-6A1-4V是一种中等强度的 a+ 相 β 钛合金，含有 6%a 相稳定元素A1和 14% β相稳定元素V。（剩余5118字）