Microstructural changes by controlling austenitizing and tempering conditions on the J-R fracture resistance of SA508 Gr. 1A low alloy steels

The microstructure, tensile properties, and J-R fracture resistance of SA508 Gr.1A low alloy steels were evaluated for different heat-treatment conditions, and the relationship between them was analyzed to investigate how the resulting microstructures affected ductile crack propagation behavior. Heat-treatment was carried out by varying the austenitizing temperature and tempering time, which changed the sizes of grains and precipitates. The...