Mechanisms of Abrasive Wear in WC/Co Hardmetals
Mechanisms of wear that occur in the abrasion of WC/Co hardmetals are reviewed.Results of laboratory abrasion tests carried out over a number of years at different length scales have been evaluated.In particular a series of in situ tribological experiments within a Scanning Electron Microscope(SEM)has provided high resolution image sequences and videos of the microstructural mechanisms that occur.Results of an EBSD analysis of model abrasion scratches are also presented that give information on the dependence of degree of plastic damage on WC grain orientation and identification of phase transformation in the Co binder.It was found that in the early stages of damage,plastic deformation occurred in both the WC and Co as evidenced by slip line traces at the surface and loss of indexing quality for EBSD analysis.Fracture then occurred in the WC aligned with the orientation of the grains.This developed further until grain fragmentation occurred with re-embedment of the WC fragments into the binder phase region of the material.There is also some evidence of displacement of material such as loss of binder in the region just below the surface.Other mechanisms of failure that were observed were removal of single or groups of WC grains from the surface,and in high stress abrasion,sub-surface cracking of WC/WC interfaces and WC grains.
WC/Co hardmetals Abrasion Wear Testing In situ testing
Gee Mark Roebuck Bryan Mingard Ken Nunn John
National Physical Laboratory,Hampton Road,Teddington,UK,TW11 0LW
国际会议
北京
英文
913-927
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）