Probabilistic Fracture Resistance of a Forged Quality Medium Carbon Alloy Steel

Abstract

Impact and fracture toughness of a large number of medium carbon alloy steel specimens have been ascertained using standard ASTM procedures, apart from examining their chemistry, microstructure, cleanliness, tensile behaviour and fracture surfaces. The results indicate that the scatter associated with ductility, impact and fracture toughness is considerable unlike that for strength or hardness. Analyses of the role of undesirable elements on toughness properties indicate that the scatter associated with fracture resistance of the steel primarily originates from the amount of tramp elements.

Search for Rapid Quality Control of Ni-Cr-Mo Low Alloy Steels Using Multifaceted Approaches for Fracture Toughness Estimation

“…But this method is limited for the purpose of process monitoring like day-to-day quality control of tonnage materials due to technoeconomic reasons owing to their time-consuming nature. As a result, limited information [5] is available on fracture toughness and fatigue behaviour of Ni-Cr-Mo low alloy steels like V-added AISI 4335 grade. The motivation in this report is two-fold in nature: (i) to illustrate a database of fracture toughness of V-added AISI 4335 steels selected from different production batches in order to indicate the influence of undesired constituents like inclusions and tramp elements on fracture toughness, estimated by standard method and (ii) to search for alternate possibilities for assessment of fracture toughness of this variety of steel for its rapid quality control; the alternate possibilities considered are estimation of fracture toughness by dynamic loading and that using chevron notched bend bar specimens.…”