Wear behaviour and mechanical properties of sinterhipped hardmetals

Abstract

This article analyses mechanical properties (strength, toughness) and wear behaviour (in different wear conditions) of WC based cobalt bonded hardmetals (prospectively for metalforming), sintered by two different techniques: vacuum and compression sintering (sinterhipping). It was found that compared with ordinary sintering, the sinterhipping technology enables the improvement of hardmetal resistance to brittle fracture (failure caused by tension stresses) as well as to wear, especially in the conditions of prevailing adhesive surface failure (metalforming, particularly blanking). The results obtained are described by the Griffith's strength theory of brittle materials.

Abrasion and Erosion Resistance of Cermets: A Review

“…Solid-particle erosion of cermets has been considered in [ 33 , 34 , 37 , 48 , 58 , 60 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 , 77 , 78 , 79 , 80 , 81 , 82 , 83 , 84 , 85 , 86 , 87 ]. Composition, hot consolidation conditions, structure (grain size of ceramic phase), mechanical properties and testing conditions of solid-particle erosion are summarized in Table 3 .…”

Performance of TiC base cermets sintered by different techniques

“…Fair correlation between the adhesive wear resistance characteristic L 1 of cemented carbides and their wear in blanking (blanking performance DD/N) was demonstrated. 7,8 The tests were complemented by scanning electron microscopy (SEM) studies, conducted on the electron microscope JEOL JSM 840A.…”

“…14 It dominates in the surface failure of cemented carbides used as tools for blanking (metal forming) operations. 8 The adhesive wear conditions were realised by turning mild steel (HV30 , 170) at low speed (v , 18 m min -1 ). The wear resistance was determined as the length of cutting path (distance) L 1 , when the wear track (height h) at the tool (specimen) nose achieves the critical value h51 mm (see Fig.…”

“…[4][5][6] Advanced TiC cermets have demonstrated their superiority over ordinary WC hard metals in blanking of sheet metals. 7,8 The sintering technology widely used for ordinary cermets (cermets with a TiC fraction less than 30% and Ni alloy or low alloyed steel binder) consists of two steps (i) presintering in hydrogen and (ii) finish sintering in vacuum. 5,9,10 Results presented in Refs 10 and 11 refer to the possibility of substituting hydrogen by argon or nitrogen.…”

“…This paper focuses on the mechanical and wear behaviour of some advanced TiC base cermets containing 60-70 wt-% TiC with Ni steel binder, prospective for metal forming. 7 The influence of sintering techniques (sintering atmospheres, vacuum level) on the properties of these alloys was analysed.…”