Effects of Processing Parameters on the Impact Toughness of Metal Injection Molded Parts


Metal Injection Molding (MIM) parts typically offer higher density and better mechanical properties than conventional P/M and at a cost savings when compared to parts machined from wrought material. However, the use of MIM parts in many demanding applications has been limited by toughness considerations. Studies have shown that the toughness values of individual MIM parts can vary widely, both within a production run and from one producer to another. In this study, unnotched Charpy impact bars were used to evaluate the toughness of MIM samples. The values were analyzed for statistical comparisons to typical wrought values. The effect of MIM processing variables on the average impact toughness and the distribution of toughness values will be reported in this paper. The processing variables will cover the molding, debinding, and sintering steps, as well as post-sinter heat treatments. Recommendations for improving both toughness and reproducibility of toughness will be presented.

Meeting Name

2001 International Conference on Powder Metallurgy & Particulate Materials (2001: May 13-17, New Orleans, LA)


Materials Science and Engineering

Keywords and Phrases

Debinding; Metal Injection Molding (MIM); Corrosion; Fatigue of Materials; Fracture Toughness; Grain Size and Shape; Microstructure; Porosity; Sintering; Tensile Strength; Weibull Distribution; Injection Molding

International Standard Serial Number (ISSN)


Document Type

Article - Conference proceedings

Document Version


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© 2001 Metal Powder Industries Federation, All rights reserved.

Publication Date

01 May 2001

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