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USE OF SMALL PUNCH TEST TO ESTIMATE THE MECHANICAL PROPERTIES OF POWDER METALLURGY PRODUCTS EMPLOYED IN THE AUTOMOTIVE INDUSTRY

  • : María Fernández1, Cristina Rodríguez2, Francisco Javier Belzunce2, Tomás García2
  • : 1PMG Asturias Powder Metal S.A.U., 2Instituto Universitario de Tecnología Industrial de Asturias
  • : PDF Download
  • : 2014

Abstract

Powder metallurgy processes using are able to form net-shaped products and are widely used in the production of automobile parts to improve productivity. The choice of powder materials and production processes, including mixing, compaction, sintering and heat treatment are critical for achieving the desired mechanical properties. Nevertheless, many times, the size and shape of the final products make impossible to extract standard specimens to analyse their mechanical properties and estimations based on other physical or chemical properties (i.e. density or carbon content) must be employed. The small punch test (SPT) seems to be a good methodology to solve the characterization of these elements, since small samples can be extracted directly from the final products (i.e, synchronizer hubs). However, there is a lack in the scientific literature about the application of the SPT on this kind of porous materials, so correlations between the SPT typical parameters and the actual mechanical properties must be established. The mechanical behavior of different metal powder materials have been analyzed making use both of small punch and standard tensile tests. Comparing their results, correlations between both types of tests were established. Using these correlations, it is possible to obtain the tensile properties of different parts of the final products, like synchronizer hub.
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