Nowadays, the metal injection molding (MIM) process is a manufacturing method to produce complex shape components. Feedstock preparation in this process is vital because produced feedstock defects can be detrimental in the following processing steps. In this study, effect of the percentage of stearic acid (SA) is investigated on the density, strength, hardness, rheological properties, and microstructure of a part made by 4605 low-alloy steel powder using the MIM process. For this reason, feedstock with different percentages of SA from 1 to 17% has been produced. Mechanical and physical properties show that SA, as a surfactant, has two impacts on the results. SA from 1 to 9% improves the powder particle’s distribution in the binder system and increases the strength and density of the sintered bodies. The results also indicate that with more surfactant growth, the density and strength dramatically decrease due to lower carbon in the sintered parts. The carbon content determines the final sample’s microstructure, which has a substantial influence on the properties. Besides, it can be inferred from the results that the hardness lessens with a gentle slope as the amount of SA in the binder system increases. From the perspective of rheological properties, more SA results in higher sensitivity of feedstocks to the shear rate.

如今，金属注射成型 (MIM) 工艺是一种生产复杂形状部件的制造方法。此过程中的原料制备至关重要，因为产生的原料缺陷可能会对后续加工步骤造成不利影响。在这项研究中，研究了硬脂酸 (SA) 的百分比对由 4605 低合金钢粉末使用 MIM 工艺制成的零件的密度、强度、硬度、流变性能和微观结构的影响。出于这个原因，已经生产了具有不同百分比的 SA 的原料，从 1% 到 17%。机械和物理特性表明，SA 作为表面活性剂，对结果有两个影响。从 1% 到 9% 的 SA 改善了粉末颗粒在粘合剂体系中的分布，并增加了烧结体的强度和密度。结果还表明，随着表面活性剂的增加，由于烧结部件中的碳含量较低，密度和强度显着降低。碳含量决定了最终样品的微观结构，这对性能有重大影响。此外，从结果可以推断，随着粘合剂体系中SA含量的增加，硬度以缓和的斜率降低。从流变特性的角度来看，SA 越多，原料对剪切速率的敏感性越高。从结果可以推断出，随着粘合剂体系中SA含量的增加，硬度以缓和的斜率降低。从流变特性的角度来看，SA 越多，原料对剪切速率的敏感性越高。从结果可以推断，随着粘合剂体系中SA含量的增加，硬度以缓和的斜率降低。从流变特性的角度来看，SA 越多，原料对剪切速率的敏感性越高。