Effect of Microstructure on the Corrosion Fatigue Crack Growth of Low and Medium Steels

Table 3

Heat treatment processes of two materials.

Material	Process name	Heating temperature (°C)	Cooling method	Microstructure
45 steel	Full annealing	870	Furnace cooling	60%ferrite + 40%pearlite
	Normalizing	870	Air cooling	30%ferrite + 70%pearlite
	Quenching and tempering	Quenching at 870 °C, tempering at 650 °C	Quenching water-cooling, tempering air cooling	Tempered fine pearlite
15CrMo	Full annealing	920	Furnace cooling	90%ferrite + 10%pearlite
	Normalizing	920	Air cooling	60%ferrite + 40%pearlite