Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2016 - zeszyt 4

Microstructural factors in the primary creep stage of two-phase titanium alloy

10.15199/28.2016.4.8

nr katalogowy: 100293
10.15199/28.2016.4.8

One of the major areas of titanium alloys application includes discs and blades of compressors in turbine engines. In titanium alloys, significant strain can accumulate as a function of time, at stresses well below the yield strength at the homologous temperature below 0.25, even at room temperature. Life prediction for elements made of titanium alloys which is based solely on steady state creep parameters is in some cases not adequate due to large primary creep strains. In the case of rotating components of aero-engines small dimensional tolerances can be threatened and transient creep strains must be taken into account in modelling of overall creep deformation. Creep and fatigue properties of two-phase titanium alloys show strong dependence on microstructure, especially morphology of the α and β phases which can be controlled to certain extent by proper selection of hot working and heat treatment conditions. In the paper the primary creep behaviour of Ti-6Al-2Mo-2Cr alloy (VT3-1) at elevated temperature was investigated. The microstructure of the alloy was varied by means of changing conditions of heat-treatment. Creep tests were carried out on the alloy with globular and lamellar microstructure at the temperature of 450°C. Primary stage of the creep process was described using various constitutive laws. Applicability of power-law and logarithmic equations for describing strain evolution was verified. The influence of the initial microstructure on the primary creep strain and strain rate at the onset of steady-state creep stage was analysed. Key words: two-phase titanium alloys, primary creep, microstructure.1. INTRODUCTION Over the recent decades titanium alloys became a prime material choice for designers of heavily loaded engineering components operating in demanding environments. Favourable combination of properties like high specific strength at room and intermediate temperature range, good fracture toughness and corrosion [...]

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