An Investigation on the Metal Injection through the Producing of MIM-ed Low-Alloy Steel

In this study, we demonstrate the injection stage of Metal Injection Molding (MIM) process to fabricate a small bend-typecomponent. This non-standard but critical engine part is made of a feedstock from the low alloy steel ۴۶۰۵. To optimizevarious injection parameters, the five-variable Box-Behnken Design (BBD) is used with the assumption of a quadraticmodel, together with the statistical method of Response Surface Methodology (RSM). Samples are then fabricated, and theirdensities are measured. Hence, the significance of these factors as well as the mutual coupling between each two parametersare investigated using the analysis of variance (ANOVA). Finally, this paper reveals that injection temperature of ۱۵۵ ◦C, theinjection speed of ۸۰ mm/s, holding pressure of ۸۳ bar, holding time of ۹ s and the injection pressure of ۱۳۲ bar led to anoptimum density of the green part, which becomes ۴.۸۹۲ g/cm۳. Then, a new sample is produced using these optimizedsettings, and the green component density is measured, which is extremely near to the predicted value. After sintering, theoptimized sample’s density and hardness are compared to the MIM-۴۶۰۵ standard criteria.

کلیدواژه ها:

Metal Injection Molding ، Low Alloy Steel ۴۶۰۵ ، Feedstock ، Density ، Response Surface Methodology