PSI - Issue 65

D.S. Bezverkhy et al. / Procedia Structural Integrity 65 (2024) 17–24 D. S. Bezverkhy and N. S. Kondratev / Structural Integrity Procedia 00 (2024) 000–000

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4

4. Results and discussion

To study the process of multistage hot upsetting of a cube-shaped semi-finished product, Inconel 690 alloy was selected (Wang B. et al. (2013)), used in the nuclear, aviation and oil and gas industries. Inconel alloys have excellent corrosion resistance, high strength, and high mechanical characteristics over a wide range of temperatures and loads (Special Metals). Table 1 shows the parameters of the material model used to solve the boundary value problem.

Table 1. Parameters of the phenomenological material model for calculations in Abaqus

Parameter

Value

Source

Parameter

Value

Source

Density, kg / m 3

8190.0 (Special Metals)

Thermal conductivity coefficient, W / (m °C) Specific heat capacity, J / (kg °C) Friction coefficient

30.1

(Special Metals)

Young's modulus, GPa

125.5

(Special Metals)

738.0

(Special Metals)

Poisson's ratio Load diagram

0.33

(Special Metals)

0.3

–

–

(Wang B. et al. (2013))

Figure 3 shows the intensity fields of stresses and strains of the workpiece at the end of each stage of hot upsetting.

Fig. 3. Intensity fields of stresses and strains of the workpiece at the end of each stage of hot upsetting.

Figure 4 shows the stress and strain intensities of the workpiece cross sections at the end of each stage of hot upsetting. During the workpiece deformation, a division of the stress-strain state field into three characteristic areas in the cross section is observed, which is qualitatively consistent with the works (Kajtoch J. (2007), Mwema F. M. et al. (2019)). This is a consequence of the presence of non-zero friction between the contact surfaces of the workpiece and the press (Kajtoch J. (2007)).