电焊机2025，Vol.55Issue(2)：77-84,8.DOI:10.7512/j.issn.1001-2303.2025.02.08
TC4钛合金激光同轴送丝增材制造组织和性能研究
Study on Microstructure and Properties of TC4 Titanium alloy by Laser Coaxial Wire Feeding Additive Manufacturing
摘要
Abstract
Using ⌀1.2 mm TC4 titanium alloy welding wire as the raw material,through laser coaxial wire feeding additive manufacturing technology,combined with serpentine orthogonal paths,a systematic study was conducted on the relationship between the mechanical properties,cross-sectional morphology,grain size,and grain orientation of the additive test pieces in different directions and heights.The research results show that under optimized process parameters,the surface formation of the test pieces is good(silver-white,no spatter),and there are no internal defects such as pores and cracks(meeting the re-quirements of NB/T 47014.2-2015 Grade I).Microstructure analysis shows that the bottom of the additive samples forms a fine basketweave microstructure due to multiple thermal cycles,and the characteristics of the bimodal microstructure and Widmanstätten structure in the middle and upper parts are more prominent.The grain orientation difference decreases with increasing height(the bottom X/Y directions are 45.9°/43.1°,decreasing to 37.8°/35.9° at the top).Mechanical property tests show that the tensile strength in the transverse and longitudinal directions(difference 2.57%),elongation after fracture(dif-ference 4.44%),and impact toughness(52.6 J and 55.3 J)all meet the requirements for TC4 plates in CCS"Material Weld-ing and Code 2023".In addition,due to the influence of thermal cycling during the additive process,the grain size of the lower layer deposited microstructure is smaller and the hardness is higher.The grain size,grain orientation,and microstruc-ture morphology of the additive test pieces in the transverse and longitudinal directions are similar,and the anisotropy of me-chanical properties is small.This study provides important experimental evidence for the engineering application of TC4 tita-nium alloy laser coaxial wire feeding additive manufacturing technology.关键词
TC4钛合金/激光增材制造/同轴送丝/组织和性能/蛇形正交路径Key words
TC4 titanium alloy/laser additive manufacturing/coaxial wire feeding/microstructure and properties分类
金属材料引用本文复制引用
符成学,尹艳超,雷小伟,余巍,崔永杰,马照伟..TC4钛合金激光同轴送丝增材制造组织和性能研究[J].电焊机,2025,55(2):77-84,8.基金项目
国防基础科研计划(JCKY2021206B039) （JCKY2021206B039）
