Study Of Microstructure And Hardness Of Assab Corrax Steel Annealing

Hardness testing and microstructures investigation have been performed at annealed Assab Corrax steel. This preliminary research is gain to look for the high temperature operation resisting materials. The steels were annealed to observe grains and hardness changes in two ways; annealing-temperature constant (400oC) and annealing-time hold constant (4 hours). The results show that the hardness vs. time-hold fluctuates between 200 Hv and 400 Hv, meanwhile it tends to increase due to precipitation hardening by means annealing temperatures. In summary, the hardness is unpredictable by means time-hold and it improves due to precipitation role. The surface micrographs support the phenomena