【摘要】 使用微米级316L不锈钢粉末和蜡基粘结剂制备热融性喂料,用FDM型金属3D打印方法和工艺3D打印成形目标模型生胚,经过脱脂和烧结成形为最终金属试样。对制备出的金属试样进行性能表征和测试,验证了此种成形方式的可行性,针对试样中析出物的形貌不规则和晶界上的夹杂物,研究了稀土La对析出物的影响。根据生胚脱脂后形成的微孔结构,提出一种液相添加稀土La的方法。结果表明:用FDM型3D打印能制备316L不锈钢试样,用液相添加法可向生胚中添加微量稀土La,质量比为0.3%的LaCl3能显著改善烧结后试样中析出物的微观形貌和分布。更多还原

【Abstract】 The hot melt feedstock was prepared with micron 316 L stainless steel powder and wax based binder. The green body was formed by 3D printing, and the final product was formed by degreasing and sintering. Through the performance characterization and test of the final product, the feasibility of this forming method has been verified. Aiming at relieving the irregular morphology of precipitates and the emerge of inclusions on grain boundaries of the prepared products, the influence of rare earth La on the deposition has been explored. Based on the microporous structure formed by degreasing of the green body, a method of adding La via liquid phase has been proposed. The results show that 316 L stainless steel products can be prepared by FDM type 3D printing, trace rare earth La can be added to the green body via liquid phase addition method, and the mass ratio of 0.3% LaCl3 can significantly improve the microstructure and distribution characteristics of final products after sintering.更多还原