The Influence of Thermo-Plastic Processes on Materials Recovery

Abstract:

The influence of thermo-plastic processes through methods of severe plastic deformations (SPD) and rolling carried out at ambient and cryogenic temperatures on recovery of two materials was investigated. The aim of this study was to insert strains to materials having middle and high stacking fault energy (SFE) in ambient and cryogenic temperature conditions, respectively and subsequently, through DSC method, to observe an influence of the storage energy on structural recovery of materials. As experimental materials were used oxygen free high conductivity copper (OFHC Cu) and C-Si steel which represent materials with middle and high stacking fault energy (SFE), respectively. The OFHC Cu was subjected to equal channel angular rolling (ECAR) by seven passes. ECAR is a method belonging to a SPD group. It was shown, five ECAR passes have a significant effect on material properties. The rolling performed at cryogenic temperatures using a laboratory duo rolling mill was carried out only once. This study implies that a recovery process (characterized by the mobility of structural defects) starts as follows: for OFHC Cu without ECAR and processed by 5^th ECAR passes: 0.31·T_melt and 0.19·T_melt, respectively, for C-Si steel processed by cryorolling: 0.095·T_melt.

• Periodical: Materials Science Forum (Volume 782)
• Pages: 379-383
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.782.379
• Online since: April 2014
• Authors: Tibor Kvačkaj*, Robert Kočiško, Robert Bidulský, Jana Bidulská, Peter Bella, Miloslav Lupták, Andrea Kováčová, Július Bacsó
• Keywords: Cryorolling, C-Si Steel, ECAR, OFHC Cu, Recovery, SFE, Thermo-Plastic Processes

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