Regional microstructure control of large thickness TC4 titanium alloy during direct laser deposition connection
In order to tackle the issue of microstructure coarsening and mechanical property degradation resulting from thermal accumulation effects of large-thickness titanium alloy components during direct laser deposition connection,this study focused on investigating the application of regional microstructure control as a potential solution.The variations of grain size and precipitation phase morphology at different positions of the large-scale component with laser power and scanning rate were analyzed.A regional microstructure control method of direct laser deposition connection components was developed.The results show that the adjustment of microstructure morphology by altering the laser power exhibits a relatively high sensitivity to parameters.In addressing the issue of microstructure coarsening caused by thermal accumulation during direct laser deposition connection,it is necessary to modulate the scanning rate to control the microstructure of the upper and middle sections of the sample.When the effective laser energy is 5.46×105 J,the tensile strength of the direct laser deposition connection sample reaches approximately 915 MPa,accompanied by relatively large size dimples,which indicates excellent plastic toughness of the material.Therefore,regional microstructure control in the direct laser deposition connection has guiding significance for optimizing process parameters and improving overall mechanical properties.
direct laser deposition connectionTC4 titanium alloyeffective laser energymicrostructureregional control
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NSTL
万方数据
维普
