Numerical simulation of investment casting process of nickel-based alloy.

O Ben Lenda,O Jbara,E Saad,A Tara,S Aniss

doi:10.1051/matecconf/201928603005

O Ben Lenda, O Jbara + Show 3 more

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https://doi.org/10.1051/matecconf/201928603005

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Abstract

In this paper, we elaborated the nickel-based alloy type Hastelloy G30 and we analyzed it by techniques of characterization in order to interpret the results obtained through a computer simulation. The calculation of the thermo-physical properties of the alloy and the simulation of filling and solidification of the casting was performed by the software ProCAST. The validation of the numerical results was done by the following experimental techniques: optical microscopy and hardness test. In the center of the elaborate piece, the experimental results showed the appearance of porosity and leading to embrittlement of the alloy. According to the numerical simulation, this is caused by a fraction of the liquid that remains trapped in this area.

Highlights

The Nickel-based superalloys have been developed to combine improved properties at elevated temperatures. [1]
The aim of this work to elaborate Hastelloy G30, to analyze it by some techniques of characterization and to interpret the results obtained through a simulation of its solidification
We observed that the predicted porosity in the center of the plate is between 0.44 and 1.78%, while the rest of the plate is non-porous. These results indicate that microporosity defects are formed at the end of the solidification sequence due to the formation of liquid island at the center of the plate

Summary

Introduction

The Nickel-based superalloys have been developed to combine improved properties at elevated temperatures. [1]. The quality of alloys is commonly affected by various internal defects. Among these defects, we cite the porosity which is a very difficult defect to remove by subsequent thermomechanical treatments [4]. Works on the prediction of porosity of nickel-based superalloys is limited compared to those done on aluminum-based alloys and steels [7, 8]. The interest of predicting the formation of defects in the investment casting of the nickel-based superalloys was renewed at the end of the second millennium [9 – 12]. The aim of this work to elaborate Hastelloy G30, to analyze it by some techniques of characterization and to interpret the results obtained through a simulation of its solidification

Methods

Results

Conclusion