July 1989

Document Type


Degree Name



Dept. of Materials Science and Engineering


Oregon Graduate Center


There have been many studies on thermal cutting. However, few have considered the influence of the resulting heat affected zone (HAZ) on the tensile or impact properties. Hence, in the present work HAZ microstructure and mechanical properties for thermally cut A514, A572 and A588 structural steels were studied as a function of cutting speed. The effect of thermal cutting was analyzed microstructurally and by both tensile and impact tests at varying test temperatures and strain rates. The HAZ of the three steels were found to have higher microhardness, higher strength, lower impact toughness, and lower ductility than the base metal. Also with increased flame cutting speed the HAZ hardness and strength increased while the ductility and impact toughness decreased. However, no brittle fracture initiation in the HAZ was observed. Scanning electron micrographs of the fractured tension and Charpy V-notch (CVN) impact specimens showed dimpled and quasi cleavage type fracture. The HAZ microstructure analysis was done and a correlation between microstructure and properties was made.





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