Alloy Steel Dynamic Strain-Aging and Notch Brittle Fracture

[+] Author and Article Information
W. R. Clough

School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Ga.

J. Basic Eng 91(1), 44-48 (Mar 01, 1969) (5 pages) doi:10.1115/1.3571025 History: Received July 24, 1968; Online November 03, 2011


Transverse V-notch Charpy specimens prepared from sheet bar of 1045, 4140, and 4340, each in four different metallurgical conditions, were deformed to fracture in slow bending at four diverse combinations of deflection rate and temperature within the blue-brittle range. In more than half of the instances, after reaching the maximum load condition, load-deflection curves showed instantaneous load drops due to the occurrence of rapidly propagating fractures. Fracture surfaces were replicated and examined by electron fractographic techniques. The rapidly propagating cracks involved cleavage or quasi-cleavage, conclusively demonstrating that notch brittle fracture can occur with alloy steels undergoing dynamic strain-aging at considerably elevated temperatures.

Copyright © 1969 by ASME
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