Influence of microstructure on wear behaviour of uncoated WC tools in turning of Alloy 718 and Waspaloy
Journal article, 2012

The effect of grain size in wrought Alloy 718 and Waspaloy on the wear of cemented carbide tools was examined by measuring the progression of wear in a specific transverse turning operation. Work material with different microstructure was achieved through heat treatments of the material from a single batch, for each alloy. The worn cutting tools were analysed by means of scanning electron microscopy and X-ray microanalysis to study the wear mechanism. The grain size of the work material in relation to undeformed chip thickness is found to control the depth of cut (DOC) notch wear, which is the tool life limiting factor when machining the work material with large grain size. The adhesive wear is shown to dominate on the rake face, but this wear is not tool life limiting since the cladding of work material to the tool surface basically protects the tool from further wear. Concerning the flank wear, machining of Waspaloy is associated with less such wear than machining of Alloy 718 irrespective of grain size. The analysis shows that higher cutting forces and expected cutting resistance due to higher work to fracture cannot explain the difference in flank wear. Instead, from the analysis of the oxidized surface below the flank wear it is supposed that the difference in tribological conditions is an important factor for flank wear development.

oxidation

Notch wear

superalloy

Superalloys

Tool wear mechanism

Metal cutting

carbide

Author

Stefan Olovsjö

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

Lars Nyborg

Chalmers, Materials and Manufacturing Technology

Wear

0043-1648 (ISSN)

Vol. 282 12-21

Subject Categories

Materials Engineering

DOI

10.1016/j.wear.2012.01.004

More information

Created

10/7/2017