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Microstructure and Mechanical Properties of AISI 8620 Steel Processed by ECAP

Published online by Cambridge University Press:  30 July 2014

Diana M. Marulanda ,
Jair G. Cortés ,
Marco A. Pérez  and
Gabriel García
Diana M. Marulanda
Affiliation:
Research Group in energy and materials (REM), Universidad Antonio Nariño, 22th Street 12D81 South, Bogotá, Colombia.
Jair G. Cortés
Affiliation:
Research Group in energy and materials (REM), Universidad Antonio Nariño, 22th Street 12D81 South, Bogotá, Colombia.
Marco A. Pérez
Affiliation:
Research Group in energy and materials (REM), Universidad Antonio Nariño, 22th Street 12D81 South, Bogotá, Colombia.
Gabriel García
Affiliation:
Research Group in energy and materials (REM), Universidad Antonio Nariño, 22th Street 12D81 South, Bogotá, Colombia.
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Abstract

The aim of this work is to process by equal channel angular pressing (ECAP) a low carbon – triple-alloyed steel containing 0.2% C, 0.5% Cr, 0.6% Ni, 0.2% Mo and 0.8 Mo. The process is performed at room temperature for up to four passes using route Bc with an equivalent strain of ∼0.6 after a single pass. Structure evolution before and after deformation is studied using scanning electron microscopy (SEM) and x-ray diffraction (XRD) and mechanical properties are assessed by microhardness and tensile testing. A significant improvement of the mechanical properties is found with increasing number of ECAP passes. Micro-hardness increases from 216 HV for the initial sample to 302 HV after four passes and tensile strength increases to 1200 MPa compared with 430 MPa prior to ECAP. X-ray diffraction and SEM analysis show changes in the original ferritic-perlitic structure through ferrite grain refinement and the deformation of perlite. This nickel-chromium-molybdenum alloy is used in manufacturing as gear material, and when it is hardened and formed through carburizing or boronizing it can be used to make hard-wearing machine parts. However, the ECAP process has not been used to harden this steel and to change its structure to obtain better mechanical performance.

Keywords

steelstrengthstructural
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1611: Symposium 4A – Advanced Structural Materials--2013 , 2014 , pp. 89 - 94
Copyright
Copyright © Materials Research Society 2014 

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