Cleavage initiation in the intercritically reheated coarse-grained heat affected zone:Part II. Failure criteria and statistical effects

Davis, C.L. and King, J.E. (1996). Cleavage initiation in the intercritically reheated coarse-grained heat affected zone:Part II. Failure criteria and statistical effects. Metallurgical and Materials Transactions A, 27 (10), pp. 3019-3029.

Abstract

In part 1 of this article, cleavage initiation in the intercritically reheated coarse-grained heat affected zone (IC CG HAZ) of high-strength low-alloy (HSLA) steels was determined to occur between two closely spaced blocky MA particles. Blunt notch, crack tip opening displacement (CTOD), and precracked Charpy testing were used in this investigation to determine the failure criteria required for cleavage initiation to occur by this mechanism in the IC CG HAZ. It was found that the attainment of a critical level of strain was required in addition to a critical level of stress. This does not occur in the case of high strain rate testing, for example, during precracked Charpy testing. A different cleavage initiation mechanism is then found to operate. The precise fracture criteria and microstructural requirements (described in part I of this article) result in competition between potential cleavage initiation mechanisms in the IC CG HAZ.

Publication DOI: https://doi.org/10.1007/BF02663851
Divisions: Aston University (General)
Uncontrolled Keywords: crack initiation,fracture mechanics,heat affected zone,impact testing,strain rate,stress concentration,crack tip opening displacement,high strength low alloy steel,intercritically reheated coarse grained heat affected zone,precracked Charpy testing,steel,Metals and Alloys
Published Date: 1996-10

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