Effect of Annealing Temperature on the Microstructure, icrohardness, Mechanical Behavior and Impact Toughness of Low Carbon Steel Grade 45

摘要

Due to the high usage of low carbon steel in multiplications, previous work was focused toward its mechanical characteristics, this work rely on studying the effect of multi-régimes of annealing temperatures namely; 820,860, 900, and 940 ?C on the impact toughness, microstructure, microhardness and mechanical characteristics. A set of test specimens for impact, compression test, and microstructure test were prepared using CNC machine. It was found that the impact energy is increased as the annealing temperature increase; the maximum is 22.5 % that achieved at 820?C. it was found that the microhardness decrease as the annealing temperature increase except at 940 ?C it return back to increase, the maximum decrease was 31.6 % that achieved at 900 ?C.