Determining the Hot Deformation Temperature Range of Medium Carbon Ni-Cr-Mo Low Alloy Steels using Hot Tensile and Hot Torsion Tests

Autor: F. Mostafaee Heydarloo, M. Morakabati, H. Badri
Jazyk: perština
Rok vydání: 2020
Předmět:
Zdroj: Journal of Advanced Materials in Engineering, Vol 39, Iss 3, Pp 99-115 (2020)
Druh dokumentu: article
ISSN: 2251-600X
2423-5733
Popis: 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.
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