Binder-jetting additive manufacturing of Mg alloy densified by two-step sintering process. (December 2021)

• Record Type: Journal Article
• Authors: Su, Chen; Wang, Jingfeng; Li, Hongyun; You, Zhipeng; Li, Junchao
• Is Part Of: Journal of manufacturing processes. Volume 72(2021)
• Page Start: 71
• Page End: 79
• Publication Date: 2021-12
• Subjects: Mg alloy -- Binder jetting additive manufacturing -- Two-step sintering -- Properties; Production management -- Data processing -- Periodicals; Manufacturing processes -- Periodicals; Procestechnologie; Productietechniek; Production -- Gestion -- Informatique -- Périodiques; Fabrication -- Périodiques; Manufacturing processes; Production management -- Data processing; Periodicals; 670.5
• DOI: 10.1016/j.jmapro.2021.09.061
• Languages: English
• ISSNs: 1526-6125

Abstract

Abstract: Difficult to effectively densify in a short time is an important issue that limits the application of magnesium (Mg) alloy fabricated by binder jetting additive manufacturing (AM) process. In this study, two-step sintering (TSS) process was utilized to improve the density of printed Mg alloy samples. Results show that the relative density, mechanical properties and corrosion resistance of the samples after different TSS process were dramatically improved in a short time. A suitable sintering temperature of first sintering step can rapidly increase the density of the samples in a short time. During the second step sintering process, little exceeding the liquidus temperature can further increase the density of the sample, but little lower than the liquidus temperature will lead to a sharp increase in grain size. The sample after sintering at 680 °C for 30 min then sintering at 610 °C for 6 h shows the highest relative density (0.995), the highest strength (394 MPa), the lowest corrosion rate (101 mm/year) and the smallest corrosion current density (60.4 μA/cm 2 ). Compared with one-step sintering process, TTS process has higher sintering efficiency. Highlights: The first time using two step sintering to densify the binder jetting Mg alloy. The final products show the nearly full density and remarkable strength. Increasing the corrosion resistance by reducing the element segregation and pores. The final products maintain the original shape after sintering process.