粘结剂喷射3D打印GH4099的工艺优化及组织性能研究

Process Optimization, Microstructure and Properties of the GH4099 Fabricated by Binder Jetting 3D Printing

摘要:

针对GH4099合金复杂构件对成形精度与服役性能的高要求，本工作开展了基于粘结剂喷射3D打印（binder jetting 3D printing，BJ3DP）的成形工艺优化与组织性能研究。通过正交试验分析层厚、粘结剂饱和度、铺粉速度及干燥时间对生坯表面质量的影响，明确粘结剂饱和度为主控因素，优化参数显著提升了成形均匀性与尺寸稳定性。进一步探究了烧结温度对组织与性能的调控作用，研究发现1345 ℃条件下相对密度达98.4%，组织致密，析出大量共格的L1₂型Ni₃(Al,Ti)相，在该条件下表现出了最佳的力学性能，抗拉强度和屈服强度分别为669和590 MPa。研究建立了BJ3DP成形参数与烧结制度协同调控GH4099组织-性能的作用机制，为实现高性能镍基合金复杂构件提供了新思路和理论支撑。

Abstract:

This work investigated the forming process optimization, microstructure and properties of the GH4099 alloy fabricated by binder jetting 3D printing (BJ3DP) to meet the needs of forming accuracy and service performance of complex components. The effects of layer thickness, binder saturation, roller traverse speed and drying time on the surface quality of green samples were analyzed through orthogonal experiments. The results reveal that binder saturation is the main control factor. The optimized parameters significantly improve the forming uniformity and dimensional stability. In addition, the influence of sintering temperature on microstructure and properties was also investigated. It is found that when the sintering temperature is 1345 ℃, the relative density of the sample reaches 98.4%, and a large amount of coherent L1₂-Ni₃(Al,Ti) phase are precipitated in this sample. Under this condition, the optimum mechanical properties are obtained, i. e., tensile strength of 669 MPa and yield strength of 590 MPa. The work establishes the mechanism of the synergistic regulation of GH4099 microstructure-property by printing and sintering parameters of BJ3DP, providing new ideas and theoretical support for achieving high-performance complex components of nickel-based alloys.