Journal of Advanced Materials in Engineering | 卷:39 |
Determining the Hot Deformation Temperature Range of Medium Carbon Ni-Cr-Mo Low Alloy Steels using Hot Tensile and Hot Torsion Tests | |
M. Morakabati1  F. Mostafaee Heydarloo1  H. Badri1  | |
[1] Faculty of Material and Manufacturing Technologies, Malek Ashtar University of Technology, Iran.; | |
关键词: medium carbon low alloy steel; microalloying elements; hot deformation; dynamic recrystallization; non-recrystallization temperature.; | |
DOI : | |
来源: DOAJ |
【 摘 要 】
The aim of this study was to investigate the suitable temperature range for hot deformation of three medium carbon Ni-Cr-Mo low alloy steels by hot tensile and hot torsion tests. Hot tensile tests were carried out in the te,prature range of 850-1150°C at a constant strain rate of 0.1 s-1 until fracture. Then, the tensile flow behavior, hot ductility and microstructural evolution of the steels were studied. Hot torsion tests were performed in the temperature range of 1200-780°C at strain of 0.1 with strain rate of 1s-1. The effect of titanium and niobium on the mean flow stress and the non-recrystallization temperature were investigated. The tensile test results showed that dynamic recrystallization was the dominant mechanism at temperatures above 950°C in the base steel and temperatures above 1050°C in the microalloyed steels. The results of hot torsion tests showed that the non-recrystallization temperatures of the base, Ti containing and Nb containing steels were 1070°C, 1069°C and 1116°C, respectively. Finally, the suitable hot deformation temperature range to achieve optimum mechanical properties in the base and Ti containing steels obtained as 950-1070°C and that of Nb containing steel obtained as 950-1100°C.
【 授权许可】
Unknown