Influence of Heat Treatment Technology on the Structure and Properties of Thick Sheet Steel ASTMS14 Degree F

Résumé

In this paper, based on the researches carried out a heat treatment technology can be determined which further lead to an optimum set of mechanical properties according to the technical conditions: A. Annealing (austenite at temperature 920 ^oC, exposure 2 minutes/mm, water cooling) and B. Tempering (heating at temperature 680 ^oC, exposure 4 minutes/mm, air cooling). The micro-structural analysis showed the structural modifications which takes place when tempering within 580-700 ^oC. Upon heating, the martensite out of balance structural tend to get transformed. To be able to characterize steels in terms of their physical and mechanical properties, a significant role is played by the pull tests. The following mechanical characteristics was determined: ultimate strength (R_m), yielding point standing (R_p0,2), breaking elongation (A₅) and the resilience test (KV_L).