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Characterisation of the Flow Behaviour of Powder Metallurgical Semi-Finished Products for Lubricant-Impregnated Cold Forming Concepts

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Abstract:

In cold bulk metal forming, coatings based on zinc phosphate are commonly used for lubrication. This has a negative impact on the environment, negatively affects human health, and requires significant pre-and post-surface treatments. Powder metallurgical (PM) components are a promising alternative to zinc phosphate coatings due to the process related porosity of the workpiece which acts as lubricant reservoir. During the forming process, the lubricant stored in the pores is released and lubricates the tool and workpiece surfaces. For an efficient process design of such components, finite element method (FEM) is an effective tool to analyse forming and friction behaviour. To this end, a realistic material model is essential for accurate simulation results. Hence, in this work, the flow behaviour of PM semi-finished products is characterised by means of compression and tensile tests. The results indicate that the material exhibits different behaviour under compression and tension. In compression, the material demonstrates higher yield strength and flow stresses compared to tension. Additionally, inhomogeneity of the material distribution can be observed, characterised by a denser core and more porous outer regions. The porous outer regions make it suitable for storing lubricant for application in forming processes.

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Periodical:

Materials Science Forum (Volume 1183)

Pages:

25-33

DOI:

https://doi.org/10.4028/p-IZfbh8

Citation:

Cite this paper

Online since:

April 2026

Authors:

Kishan Rahul Prajapati*, René Laeger, Norman Mohnfeld, Julius Peddinghaus, Johanna Uhe, Bernd Arno Behrens

Keywords:

Characterisation, Flow Behaviour, Porosity, Powder Metallurgy

Funder:

The publication of this article was funded by the Leibniz Universität Hannover (LUH) / Technische Informationsbibliothek (TIB)

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Creative Commons CC BY 4.0

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* - Corresponding Author

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