Simulated weld heat affected zone structures and properties of HY 80 low alloy steel

Abstract

Single and double thermal cycle simulation of heat affected zone (HAZ) structures has been used to study the structural and property changes produced by submerged arc welding of HY 80 steel. The effectiveness of the temper bead technique and post-weld heat treatment at 650°C have also been examined, Marked degradation of impact properties occurs, particularly in the grain-coarsened region of the HAZ. Misalignment of a temper bead may result in a further impairment of notch-toughness. Post-weld heat treatment is shown to be effective in restoring properties to levels similar to those of the parent plate. The significance of the results is discussed in relation to submarine applications. Starting in 1946 as the College of Aeronautics, the Cranfield Institute of Technology was granted university status in 1969. In 1993 it changed its name to Cranfield University.