Identification of abrasion regimes based on mechanisms of wear on the steel stylus used in the Cerchar abrasiveness test

The wear of tools in rock excavation is a challenging and costly issue. To predict the added costs arising from wear, field and laboratory investigations can be conducted during the early stages of a project. Accordingly, a measure of particle abrasivity is needed. Abrasivity is defined as the capab...

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Bibliographic Details
Published in:Wear 2018-09, Vol.410-411, p.181-189
Main Authors: Piazzetta, Gabriela Reis, Lagoeiro, Leonardo E., Figueira, Isabella Françoso Rebutini, Rabelo, Melina Almeida Gonçalves, Pintaude, Giuseppe
Format: Article
Language:English
Subjects:
Abrasion
Abrasive wear
Abrasiveness
Abrasives
Deformation mechanisms
Drilling
Geological materials
Laboratory tests
Microstructure
Plastic deformation
Rock drilling
Rocks
Styli
Tool steels
Tool wear
Tribology
Wear
Wear mechanism
Wear mechanisms
Wear testing
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Summary:The wear of tools in rock excavation is a challenging and costly issue. To predict the added costs arising from wear, field and laboratory investigations can be conducted during the early stages of a project. Accordingly, a measure of particle abrasivity is needed. Abrasivity is defined as the capability of different kinds of soils and rocks to cause abrasive wear of metallic surfaces. The Cerchar abrasiveness test is a well-recognized lab test for assessing rock abrasivity. The Cerchar Abrasiveness Index (CAI) is determined by measuring the crater diameter [mm] produced by a conical steel stylus moving under a fixed load and sliding distance. Many authors have been trying to correlate CAI with rock properties, but no consensus has been achieved. The main reason for this difficulty arises from the effects of the microstructural complexity of rocks and their tribological response. This investigation proposes a new approach based on the use of a scanning electron microscope to identify the wear mechanisms acting on the Cerchar stylus (AISI A2 tool steel) during testing, and comparing these observations to the corresponding CAI values for nine different rock types (0.1 
ISSN:0043-1648
1873-2577
DOI:10.1016/j.wear.2018.07.009