Journal of Materials Research and Technology Journal of Materials Research and Technology
J Mater Res Technol 2017;6:355-60 DOI: 10.1016/j.jmrt.2017.05.002
Original Article
Effects on hardness and microstructure of AISI 1020 low-carbon steel processed by high-pressure torsion
Diana Maritza Marulanda Cardonaa, Jittraporn Wongsa-Ngamb, Hernando Jimeneza, Terence G. Langdonc,,
a Research Group in Energy and Materials (REM), Faculty of Mechanical Engineering, Universidad Antonio Nariño, Bogotá, Colombia
b Department of Mechanical Engineering, Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang, Bangkok, Thailand
c Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton, United Kingdom
Received 10 April 2017, Accepted 08 May 2017
Abstract

Low-carbon steel AISI 1020 was subjected to high-pressure torsion (HPT) with 6.0GPa pressure through 1/4–5 turns. The microstructures of the samples in each turn were studied by means of X-ray diffraction (XRD) analyzing the changes in micro-strain, crystallite size and lattice parameter. Vickers testing was utilized to study the microhardness behavior of the samples subjected to HPT processing. The morphology evolution of the samples and especially the changes in ferrite and pearlite structures were studied for different numbers of turns using scanning electron microscopy (SEM).

Keywords
1020 steel, High pressure torsion, Hardness
J Mater Res Technol 2017;6:355-60 DOI: 10.1016/j.jmrt.2017.05.002