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Critical Stress for Cleavage Fracture in Continuously Cooled Medium Carbon V-microalloyed Steel

Authors
Journal
Procedia Materials Science
2211-8128
Publisher
Elsevier
Identifiers
DOI: 10.1016/j.mspro.2014.06.199
Keywords
  • Medium Carbon V-Microalloyed Steel
  • Acicular Ferrite
  • Critical Fracture Stress

Abstract

Abstract Cleavage fracture of the medium carbon V-microalloyed steel with structure consisting of acicular ferrite, pearlite and grain boundary ferrite has been investigated by means of four-point bending of the notched samples at -196°C. It was found that cleavage fracture initiation has not been related to the coarse second phase particles cracking. Calculated values of the effective surface energy of 49J/m2 and critical cleavage fracture stress normalized by yield stress of 1.84 are in agreement with the results for the steels with ferrite-pearlite and bainite structures.

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