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Analysis of degradation processes on shot sleeves made from new Si-Mo cast iron in aluminium high pressure die casting – A case study

Engineering Failure Analysis, ISSN: 1350-6307, Vol: 109, Page: 104283
2020
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  • Citations
    3
    • Citation Indexes
      3
  • Captures
    14

Article Description

Analysis of damages on shot sleeve after 21.500 shots of Al in high pressure die casting machine was carried out. The shot sleeve was made from modified high Silicon Si-Mo cast iron (high silicon-SiMo – CGI shot sleeve material) instead of the common used hot forged tool steel. New material exhibits improved thermal conductivity and acceptable mechanical properties. The progress of the damages is revealed and explained in this study. Relative early formation of longer cracks on the sharp shaped spots of graphite particles and decrease in adhesion between grain boundaries have been identified. Cracks from sharp shaped spots of graphite particles have locally progressed further and linking with other cracks in neighborhood, i.e. also with cracks formed on base of adhesion decreasing between grain boundaries, that resulted in material spalling. This can be attributed to the fatigue nature of thermal (mechanical) loads as a consequence of the mutual effects of thermal stresses (gradient) on the surface layer and the different thermal dilatation properties between graphite particles and matrix material, and the occurrence of stress concentration on the sharp shaped spots of the graphite particles. This approach, i.e. production of shot sleeve by casting, allows to make the price of the unit more economical compared to the existing forged one, made from H11 or H13 grade tool steel.

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