EIGA法制备激光3D打印用TC4合金粉末

采用电极感应熔炼气雾化法(EIGA)制备激光3D打印用TC4合金粉末,研究了雾化气压对粉末收得率、粒径、粉末形貌、松装密度、流动性及空心球率等特征的影响.结果表明:随着雾化气压的增加,粉末收得率、球形度增加,而粉末平均粒径减小.雾化气压为6.0MPa时,粉末收得率超过50%,平均粒径小于100μm,松装密度为2.950 g/cm~3,流动性为2.242 g/s,空心球率低于3%.雾化气压为7.0 MPa时,非球形缺陷粉末和空心球率增加.对比雾化气压为6.0 MPa制备的不同粒径粉末,以及激光3D打印后的拉伸曲线与断口形貌,发现50~100μm粉末打印TC4合金的抗拉强度达907.7 MPa,延伸率最大达15.3%,具有良好的强韧性.

TC4 Alloy Powder Prepared by Electrode Induction Melting Gas Atomization for Laser 3D Printing

TC4 alloy powders for laser 3D printing were prepared by electrode induction melting gas atomization (EIGA). The effects of different pressures on printable powder production rate， particle size， powder morphology， apparent density， flow ability and hollow powder rate were studied. The results showed that by increasing gas pressure， the printable powder production rate and powder sphericity increase， while the particle size decreases. When the gas pressure is 6.0MPa， the powder production rate is over 50%， the average particle size is below 100μm， the apparent density is 2.950g/cm³， the flow ability is 2.242g/s and the hollow powder rate is below 3%. When the gas pressure is 7.0MPa， the broken powder and hollow powder rate increase dramatically. By comparing the tensile stress-strain curve and fractograph of the samples made by the powders with different particle size under 6.0MPa， it is found that the laser 3D printing sample using TC4 alloy powders ranging from 50 to 100μm has better strength and toughness， corresponding to the tensile strength of 907.7MPa and the ductility of 15.3%.