The corrosion behavior of Ti–6Al–2Zr–1Mo–1V(TA15)alloy fabricated through selective laser melting(SLM)technology and traditional wrought technology in hydrochloric acid solutions was investigated using electrochem...The corrosion behavior of Ti–6Al–2Zr–1Mo–1V(TA15)alloy fabricated through selective laser melting(SLM)technology and traditional wrought technology in hydrochloric acid solutions was investigated using electrochemical testing and surface characterizations,including electron backscattered diffraction,scanning electron microscopy,and X-ray photoelectron spectroscopy analyses.The results showed that both types of TA15 alloy underwent spontaneous passivation reactions in HCl solution,and with the increase in HCl concentration,the surface of SLM-TA15 sample exhibited larger and deeper pits.In comparison to SLM-TA15 sample,the pits on the wrought-TA15 sample were shallower and the surface was more uniform.Analysis of the passive current density,breakdown potential,and electrochemical impedance revealed that the corrosion resistance of both alloys decreased as the concentration of HCl increased,and SLM sample exhibited poorer corrosion resistance compared with the wrought sample.Analysis of Mott–Schottky test curves and calculation of passive film thickness indicated that the passive film of wrought-TA15 sample was superior to that of SLM-TA15 sample.展开更多
The relationships between the selective laser melting(SLM)processing parameters including laser power,scanning speed and hatch space,the relative density,the microstructure,and resulting mechanical properties of Ti-6A...The relationships between the selective laser melting(SLM)processing parameters including laser power,scanning speed and hatch space,the relative density,the microstructure,and resulting mechanical properties of Ti-6Al-2Zr-1Mo-1V alloy were investigated in this work.The result shows that laser power acts a dominant role in determining the relative density in comparison with scanning speed and hatch space.The optimal SLM process window for fabricating relative density>99%samples is located in the energy density range of 34.72 J·mm^(-3)to 52.08 J·mm^(-3),where the laser power range is between 125 W and 175 W.An upward trend is found in the micro-hardness as the energy density is increased.The optimum SLM processing parameters of Ti-6Al-2Zr-1Mo-1V alloy are:laser power of 150 W,scanning speed of 1,600 mm·s^(-1),hatch space of 0.08 mm,and layer thickness of 0.03 mm.The highest ultimate tensile strength,yield strength,and ductility under the optimum processing parameter are achieved,which are 1,205 MPa,1,099 MPa,and 8%,respectively.The results of this study can be used to guide SLM production Ti-6Al-2Zr-1Mo-1V alloy parts.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.51971067 and 52001080)Beijing Natural Science Foundation(Grant No.3232005).
文摘The corrosion behavior of Ti–6Al–2Zr–1Mo–1V(TA15)alloy fabricated through selective laser melting(SLM)technology and traditional wrought technology in hydrochloric acid solutions was investigated using electrochemical testing and surface characterizations,including electron backscattered diffraction,scanning electron microscopy,and X-ray photoelectron spectroscopy analyses.The results showed that both types of TA15 alloy underwent spontaneous passivation reactions in HCl solution,and with the increase in HCl concentration,the surface of SLM-TA15 sample exhibited larger and deeper pits.In comparison to SLM-TA15 sample,the pits on the wrought-TA15 sample were shallower and the surface was more uniform.Analysis of the passive current density,breakdown potential,and electrochemical impedance revealed that the corrosion resistance of both alloys decreased as the concentration of HCl increased,and SLM sample exhibited poorer corrosion resistance compared with the wrought sample.Analysis of Mott–Schottky test curves and calculation of passive film thickness indicated that the passive film of wrought-TA15 sample was superior to that of SLM-TA15 sample.
基金supported by Liaoning Doctoral Research Start-up Fund project(Grant No.2023-BS-215).
文摘The relationships between the selective laser melting(SLM)processing parameters including laser power,scanning speed and hatch space,the relative density,the microstructure,and resulting mechanical properties of Ti-6Al-2Zr-1Mo-1V alloy were investigated in this work.The result shows that laser power acts a dominant role in determining the relative density in comparison with scanning speed and hatch space.The optimal SLM process window for fabricating relative density>99%samples is located in the energy density range of 34.72 J·mm^(-3)to 52.08 J·mm^(-3),where the laser power range is between 125 W and 175 W.An upward trend is found in the micro-hardness as the energy density is increased.The optimum SLM processing parameters of Ti-6Al-2Zr-1Mo-1V alloy are:laser power of 150 W,scanning speed of 1,600 mm·s^(-1),hatch space of 0.08 mm,and layer thickness of 0.03 mm.The highest ultimate tensile strength,yield strength,and ductility under the optimum processing parameter are achieved,which are 1,205 MPa,1,099 MPa,and 8%,respectively.The results of this study can be used to guide SLM production Ti-6Al-2Zr-1Mo-1V alloy parts.
