NDLI: Wear Transition as a Means of Fracture Toughness Evaluation of Hardmetals

Content Provider	Springer Nature Link
Author	Scieszka, S.F.
Copyright Year	2001
Abstract	The main objective of this investigation was to define operating parameters for a novel method for the simultaneous evaluation of abrasion wear resistance and fracture toughness of hardmetals. The optimal design of a tribotester and a testing procedure from the operational cost and time criteria point of view was another target of the investigation. The method of testing is based on the finding that the wear transition stage, typical for the early and unsteady stage of the wearing process, is controlled by brittle fracture of hardmetal specimens while the following steady-state is controlled by abrasion processes. The brittle fracture of edges will control the wearing-in process only if the edges are initially sharp, the material is fairly brittle (e.g., hardmetal, cermetal), and material is tested on the edge as in the presented tribotester. Precise identification of the tribological transition for every hardmetal grade was possible thanks to the particular specimen shape (with three distinct edges) and to periodic monitoring of specimen mass loss. The fracture-mechanics-based model developed during the course of this investigation was used in the calculation of fracture-toughness values for the hardmetal grades tested. The rating of hardmetals according to their fracture toughness as well as their resistance to abrasive wear in rubbing contact with particulate alumina are presented. The effect of additional hot isostatic pressing (HIPing) on mechanical properties of the hardmetals tested is also illustrated.
Starting Page	185
Ending Page	194
Page Count	10
File Format	PDF
ISSN	10238883
Journal	Tribology Letters
Volume Number	11
Issue Number	3-4
e-ISSN	15732711
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2001-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Physical Chemistry Surfaces and Interfaces, Thin Films Mechanics
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Mechanics of Materials Mechanical Engineering Surfaces and Interfaces

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