On the Brittleness of Heat-Affected Zone (Report 8)

Prestrain and brittle range

Abstract

This experiment was carried out to investigate the influences of pre-stain for the brittle zone of welded part, using both killed and rimmed steel plate. Test plates were pre-strained by tensile plastic deformation ranging from 0 to 10% after full-annealing. Then, single beads were welded. V-notched Charpy impact tests and hardnese measurements were carried out about the welded parts. It was concluded that the phenomena of quench and strain ageing are always the two main causes for the occurence of brittle zone.