Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2016 - zeszyt 1

The characteristic of deformability of Fe–Ni superalloy during high-temperature deformation

10.15199/28.2016.1.5

Kazimierz J. Ducki

nr katalogowy: 96776
10.15199/28.2016.1.5

The influence of two variants of initial soaking at 1100°C/2 h and 1150°C/2 h and parameters of hot plastic deformation on the deformability of Fe-Ni superalloy have been presented. The hot deformation characteristics of alloy were investigated by hot torsion tests using Setaram torsion plastometer. The tests were executed at constant strain rates of 0.1 and 1.0 s-1, and testing temperature in the range of 900 to 1150°C and were conducted until total fracture of the samples. Plastic properties of the alloy were characterized by worked out flow curves and the temperature relationships of maximum yield stresses (σpp) and strain limits (εf). The flow stress of the torsion tests showed a single peak in the flow stress-strain curves, and indicated that a dynamic recovery and recrystallization took place during the hot deformation. It was found that optimal values of flow stresses and strain limits were obtained for the alloy after its initial soaking at 1100°C/2 h and deformation in the temperature range of 1050÷950°C at strain rate 0.1 s-1. The increase of maximum yield stresses, σpp, and decrease of strain limit of the alloy, εf, as the initial soaking temperature was rising up to 1150°C/2 h, with the strain rate increasing to 1.0 s-1, was associated with a growth of the initial grain size and the degree of austenite saturation with alloying elements. The relationship between the maximum yield stresses and the Zener-Hollomon parameter (Z) was described by σpp = A × Zn power function. Activation energy for hot working (Q) was assessed for the alloy after two variants of initial soaking, i.e. 1100°C/2 h and 1150°C/2 h and amounted, respectively, 442 kJ/mol and 519 kJ/mol. Key words: A-286 superalloy, hot deformation, plastic properties, Zener-Holomon parameter, activation energy for hot working.1. INTRODUCTION The behaviour of metals and alloys during hot plastic working has a complex nature and it varies with the changing [...]

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