Effects of Onset Time of Fatigue and Cooling Rate on Hot Ductility of Plain Carbon Steel

摘要

The effects of cooling rate and onset time of fatigue test on hot ductility of plain carbon steels containing 0.06-0.8 wt.% carbon were investigated at various temperatures. The tensile tested specimen after fatigue strain during cooling showed higher hot ductility than the specimen fatigued and tensile-strained after cooling. With a decreasing cooling rate from solutionizing temperature to test temperature, hot ductility was increased in all temperature ranges, typically in the trough region, and the minimum point of ductility moved to a lower temperature. Also, the depth and width of the trough decreased with lowering the cooling rate.