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Studies on structural changes in titanium alloys by heat treatment

M. STOICANESCU1,* , C. PITULICE1, I. GIACOMELLI1

Affiliation

  1. “Transylvania” University of Brasov, Romania

Abstract

For the studies it has been chosen Ti6Al4V alloy; evidences of this material have undergone several heat treatment operations (afterglow, hardening, abatement). After obtaining these samples we have studied the obtained structures, the hardness and the shock resistance. The structures were analyzed at magnification between 100 and 1000 times, using both metallurgical aspect and equilibrium and heat treatment diagrams. It has been found that the parameters of the heat treatment have a decisive influence on the structural composition as well as in terms of the form, the size of crystal phases and mutual distribution of phases. It has been determined that at the same time the values of mechanical properties varied in a timely manner; thus the hardness changed from the initial value of about 20 HRC to 42…44 HRC. The resilience tests emphasized that the modification of heat treatment parameters (hardening treatment, cooling medium, abatement time) the resilience values KCU could be adjusted according to the needs. The trials carried out prove that the titanium-based alloy Ti6Al4V is appropriate to a wide range of heat treatment operations: these may have as a purpose the modification in relative distant limits the properties and structural layout. At the same time it can be taken into consideration that relatively low density and good corrosion resistance may find a wider applicability as a prosthesis material..

Keywords

Titanium alloys, Heat treatment, Microstructure, Hardness, Resilience.

Submitted at: July 30, 2015
Accepted at: Sept. 9, 2015

Citation

M. STOICANESCU, C. PITULICE, I. GIACOMELLI, Studies on structural changes in titanium alloys by heat treatment, Journal of Optoelectronics and Advanced Materials Vol. 17, Iss. 9-10, pp. 1410-1416 (2015)