Volume 39, Issue 3 (Journal of Advanced Materials-Fall 2020)
2020, 39(3): 99-115 |
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Mostafaee Heydarloo F, Morakabati M, Badri H. Determining the Hot Deformation Temperature Range of Medium Carbon Ni-Cr-Mo Low Alloy Steels using Hot Tensile and
Hot Torsion Tests. Journal of Advanced Materials in Engineering (Esteghlal) 2020; 39 (3) :99-115
URL: http://jame.iut.ac.ir/article-1-1083-en.html
URL: http://jame.iut.ac.ir/article-1-1083-en.html
Faculty of Material and Manufacturing Technologies, Malek Ashtar University of Technology, Iran. , m_morakabati@mut.ac.ir
Abstract: (3074 Views)
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.
Keywords: Medium Carbon Low alloy Steel, Microalloying Elements, Hot Deformation, Dynamic Recrystallization, Non-Recrystallization Temperature.
Type of Study: Research |
Subject:
Forming and mechanical properties
Received: 2020/05/23 | Accepted: 2020/12/5 | Published: 2020/12/20
Received: 2020/05/23 | Accepted: 2020/12/5 | Published: 2020/12/20
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