Title: A CVN-K(K_IC) correlation for H13 tool steels

Authors: S.Z. Qamar, A.K. Sheikh, A.F.M. Arif

Addresses: Mechanical and Industrial Engineering Department, College of Engineering, Sultan Qaboos University, P.O. Box 33, Al Khoud 123, Sultanate of Oman. ' Mechanical Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia. ' Mechanical Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia

Abstract: Fracture is the most common cause of die failure in hot extrusion. Prediction of fracture life requires a reasonably accurate determination of plane-strain fracture toughness (K_IC). Standard K(K_IC) testing is difficult, time-consuming, and costly. Charpy impact energy (CVN) is often used as an indirect measure of fracture toughness. Published CVN-K(K_IC) correlations do not generally apply to tool steels, and are not suitable for high temperature predictions. This paper is part of a study aimed at the development of a reasonable CVN-K(K_IC) correlation for the hot work tool steel H13, subjected to various tempering cycles and tested at different elevated temperatures, based on hardness and impact energy data.

Keywords: hot extrusion; hot work tool steels; H13 steel; fracture toughness; fracture prediction; charpy impact energy; CVN; hardness Rockwell scale C; HRC; CVN-K(K_IC) correlations; die failure; hardness; impact energy.

DOI: 10.1504/IJMPT.2008.022519

International Journal of Materials and Product Technology, 2008 Vol.33 No.4, pp.421 - 432

Published online: 12 Jan 2009 *

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