The Fracture Toughness of Hardened Tool Steels

[+] Author and Article Information
D. F. Watt, Pamela Nadin

Department of Engineering Materials, University of Windsor, Windsor, Ontario, Canada N9B 3P4

S. B. Biner

Department of Manufacturing Engineering, Bradley University, Peoria, Ill. 61625

J. Eng. Mater. Technol 109(4), 314-318 (Oct 01, 1987) (5 pages) doi:10.1115/1.3225983 History: Received December 01, 1986; Online September 15, 2009


This report details the development of a three-stage fracture toughness testing procedure used to study the effect of tempering temperature on toughness in 01 tool steel. Modified compact tension specimens were used in which the fatigue precracking stage in the ASTM E-399 Procedure was replaced by stable precracking, followed by a slow crack growth. The specimen geometry has been designed to provide a region where slow crack growth can be achieved in brittle materials. Three parameters, load, crack opening displacement, and time have been monitored during the testing procedure and a combination of heat tinting and a compliance equation have been used to identify the position of the crack front. Significant KIC results have been obtained using a modified ASTM fracture toughness equation. An inverse relationship between KIC and hardness has been measured.

Copyright © 1987 by ASME
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