Development of Constitutive Equation and Processing Maps for IN706 Alloy

doi:10.1007/s40195-014-0037-3

Abstract

Abstract:

The hot deformation behavior of IN706 has been investigated by means of hot compression tests in the temperature range of 900–1150 °C and strain rate range of 0.001–1 s^-1. The constitutive equation was developed on the basis of experimental data. Power dissipation efficiency (η) and instability parameter (ξ) maps were evaluated using the principles of the dynamic material model. Furthermore, the EBSD microstructure analysis was performed for validation, revealing that η was closely associated with the mechanism of dynamic recrystallization (DRX). Microstructure transition map was composed of contour plots of η, ξ, and DRX. The DRX domain zones and instable zones were identified in the processing map and were classified based on η. In a view of microstructure refinement and workability improvement, the optimum processing should be selected in the temperature range of 970–1025 °C and the strain rate range of 0.08–0.01 s^-1.

Key words: IN706 alloy, Constitutive equation, Power dissipation efficiency, Flow instability, Processing map

Shuo Huang, Lei Wang, Xintong Lian, Beijiang Zhang, Guangpu Zhao. Development of Constitutive Equation and Processing Maps for IN706 Alloy[J]. Acta Metallurgica Sinica (English Letters), 2014, 27(2): 198-204.

Figures/Tables 10

Fig. 1 The typical true stress–true strain curves

Fig. 2 The relationship between peak stress and deformation temperatures at different strain rates

Fig. 3 The relationships between f(σ) and ln (\( \dot{\varepsilon}\)) and 1/T

Table 1 Linear regression residual errors of f(σ) with ln \( \dot{\varepsilon } \) and 1/T

f(σ)	f(σ)-ln \( \dot{\varepsilon } \)		f(σ)-1/T
f(σ)	Adj. R-square	Sta. error	Adj. R-square	Sta. error
σ	0.9707	0.015	0.9787	0.0076
lnσ	0.9704	0.017	0.9842	0.012
ln[sinh(ασ)]	0.9835	0.015	0.9908	0.0059

Fig. 4 The relationship between lnZ and lnsinh(ασ)

Table 2 Strain rate sensitivity parameters at different deformation temperatures

T (^oC)	900	950	1000	1050	1100	1150
m	0.14671	0.16593	0.16218	0.19624	0.17645	0.2026

Fig. 5 Power dissipation a and flow instability b contour maps of IN706 at a strain of 0.8

Fig. 6 EBSD microstructural observations of IN706 alloy at a strain of 0.8 at typical zones (black zone is deformed zone; gray zone is sub-structured zone; white zone is recrystallized zone; black line is the grain boundaries higher than 10°; gray line is the the grain boundaries lower than 10°; red line is the grain boundaries of twins): a at 950 °C and at a strain rate of 1 s-1, b at 1100 °C and at a strain rate of 1 s-1, c at 950 °C and at a strain rate of 0.01 s-1, d at 1100 °C and at a strain rate of 0.01 s-1

Fig. 7 The orientation imaging microscopy map of the area indicated by the dashed box in Fig. 6d and 3d crystal orientation image of the subgrains

Fig. 8 Deformation mechanism maps of IN706 alloy

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