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为了控制粉末注射成形零件的最终尺寸精度和力学性能,对316L不锈钢粉末注射成形件的烧结致密化行为进行了试验研究,分析了烧结温度和升温速率对试件致密化行为以及烧结件力学性能的影响.试验结果表明,致密化过程始于1080℃左右,主要在1200～1300℃的升温过程中快速进行,致密化速率随着升温速率的升高而升高.烧结件的抗拉强度、抗弯强度以及延伸率,不但取决于致密化程度,而且与微观结构有关.分析表明,将基于扩散控制和强度控制的烧结理论结合,可以有效地解释316L不锈钢粉末的致密化行为,需在现有的烧结模型中考虑强度影响因素,才能更真实地模拟烧结过程.
In order to control the final dimensional accuracy and mechanical properties of the powder injection molded parts, the sintering densification behavior of 316L stainless steel powder injection molded parts was studied. The effects of sintering temperature and heating rate on the densification behavior and the mechanical properties of the sintered parts .The results show that the densification process begins at about 1080 ℃, mainly in the process of heating from 1200 ℃ to 1300 ℃, and the densification rate increases with the increase of heating rate.The tensile strength, Flexural strength and elongation are not only dependent on the degree of densification but also on the microstructure.The analysis shows that the combination of sintering theory based on diffusion control and strength control can effectively explain the densification behavior of 316L stainless steel powder, Sintering model to consider the impact of strength factors in order to more truly simulate the sintering process.