Abstract
This paper presents the characterization of a secondary cone crusher concave liner made of Hadfield steel used in Chilean mining after crushing copper minerals during all service life. During use, a cone crusher concave liner suffers indentation (cold working) and abrasion; this combination provides the concave with a layer that constantly renews itself, maintaining a surface highly resistant to abrasive wear. The results presented here were obtained using optical microscopy, microhardness test, measuring abrasion using the dry sand/rubber wheel apparatus, and x-ray diffraction peaks analysis through the classic Williamson–Hall method. After analysis of results, two hardened surfaces have been found—one a product of heat treatment and the other due to deformation during use. This work proposes ways to explain them; the first one uses a thermodynamic model to calculate stacking fault energy, and the second compares the liner with cold-rolled samples.
Highlights
IntroductionThe 200 mm material (that comes from primary crushing) is fed through the top of the equipment and is repeatedly compressed (fractured) until a product of approximately 75 mm (that goes towards tertiary crushing) is obtained that is expelled from the bottom
The surface layer is constantly subjected to deformation and abrasion
This causes surface wear and continuous renewal of the hardened layer with greater resistance to abrasion than the bulk material, with a small macroscopic strain, on the order of hundreds of microns. This is assumed, since the results obtained by analyzing diffraction peaks are in the same order of magnitude, even when they are different for the sample deformed in the crusher than for the deformed by rolling
Summary
The 200 mm material (that comes from primary crushing) is fed through the top of the equipment and is repeatedly compressed (fractured) until a product of approximately 75 mm (that goes towards tertiary crushing) is obtained that is expelled from the bottom
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