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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2013

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Hardmetals characterization by tribological means

100%

Ścieszka S. F. , Grzegorzek W. , Żołnierz M.

2013

tom Vol. 59, nr 2

86--98

Purpose: The objectives of the paper are as follows. Firstly the presentation of new and reliable integrated testing method, in which conjoin action involving fracture and abrasion of hardmetals is carefully monitored and analysed, and secondly the evaluation of the empirical relationship between mass loss as a result of edge chipping during the initial transition stage of abrasive wear and fracture toughness in the form of formula. Design/methodology/approach: The tests were performed in a purpose-built testing machine. The apparatus consists of the disc rotating in the cylindrical chamber under normal force. The specimen bars, made from the hardmetals are attached to the upper side of the disc. The results from this testing show that by using one apparatus and one shape of the test specimen it is possible to obtain a reliable rating of hardmetals. Findings: The integrated testing method required a theoretical or empirical model which describes the relationship between fracture toughness, other mechanical properties and the test’s fracture indicator. The best correlation received was for empirical model based on study on abrasive wear by lateral cracking. Practical implications: The proposed method offers advantages when used in hardmetals development programmes to rank a large number of materials in terms of abrasion and fracture resistance. Originality/value: The innovative method enables the evaluation of abrasion and fracture resistance, one shape of specimen, and one testing procedure.