Material removal factor (fab): A critical assessment of its role in theoretical and practical approaches to abrasive wear of ductile materials

Autor(es): Franco, Luiz Alberto; Sinatora, Amilton
Resumo: (EN) Material removal factor, fab, is defined by ZumGahr as “the ratio of volume of wear debris to the volume of wear groove produced”. It appears in the literature within the context of abrasive wear, usually as a possible indication of prevailing mechanisms such as plowing, wedge formation and cutting. Microcracking, an importante mechanism in the abrasion of brittle material such as highly hardened steels and ceramics, was not considered in this work. Measurements of cross section areas in scratch tests – groove and pile up – are essential for fab calculation. This paper presents a short review of the literature in that sense. It also covers scratch testing of gray cast iron (GCI) and AISI 1070 steel specimens, both with macro hardness close to 200 HV30kgf. Laboratory tests were performed under constant loads selected from 20 to 200 mN, dry interface. Geometric parameters of the scratches were measured with an optical interferometry profilometer and an SEM was used for image analysis. Clear correlations between scratch width (or depth) and applied load were observed, but that was not the case with calculated fab values. Image analysis confirmed the presence of diferente abrasion mechanisms at the same scratch shedding light on the difficulties encountered when measuring groove and pile-up areas.
Periódico: Wear
Ano: 2017
Volume: v. 382-383
Páginas: p. 51-61
DOI: http://dx.doi.org/10.1016/j.wear.2017.04.006
Ano de publicação: 2017
Disponível em: https://www.sciencedirect.com/science/article/pii/S0043164817302338?via%3Dihub
Editora com ISSN: Elsevier