High-Temperature Mechanical Properties of IN718 Alloy: Comparison of Additive Manufactured and Wrought Samples

Trunal Bhujangrao,Franck Girot Mata,Edurne Iriondo,Alfredo Suárez,Fernando Veiga

doi:10.3390/cryst10080689

Trunal Bhujangrao, Franck Girot Mata + Show 3 more

Open Access

https://doi.org/10.3390/cryst10080689

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Journal: Crystals	Publication Date: Aug 9, 2020
Citations: 45	License type: CC BY 4.0

Affiliation: Tecnalia, University of the Basque Country

Abstract

Wire Arc Additive Manufacturing (WAAM) is one of the most appropriate additive manufacturing techniques for producing large-scale metal components with a high deposition rate and low cost. Recently, the manufacture of nickel-based alloy (IN718) using WAAM technology has received increased attention due to its wide application in industry. However, insufficient information is available on the mechanical properties of WAAM IN718 alloy, for example in high-temperature testing. In this paper, the mechanical properties of IN718 specimens manufactured by the WAAM technique have been investigated by tensile tests and hardness measurements. The specific comparison is also made with the wrought IN718 alloy, while the microstructure was assessed by scanning electron microscopy and X-ray diffraction analysis. Fractographic studies were carried out on the specimens to understand the fracture behavior. It was shown that the yield strength and hardness of WAAM IN718 alloy is higher than that of the wrought alloy IN718, while the ultimate tensile strength of the WAAM alloys is difficult to assess at lower temperatures. The microstructure analysis shows the presence of precipitates (laves phase) in WAAM IN718 alloy. Finally, the effect of precipitation on the mechanical properties of the WAAM IN718 alloy was discussed in detail.

Highlights

IN718 is a nickel-based superalloy used extensively in many sectors such as aerospace, automotive, marine, shipbuilding, petrochemical and energy for the manufacture of complex parts in which the material is subjected to an aggressive environment
Experimental Procedure: The Wire Arc Additive Manufacturing (WAAM) IN718 wall is manufactured by using a Plasma arc welding system; it consists
The grains in the wrought alloy develop from conventional castings, andwall possess much bigger starting in theThe wrought alloy develop from conventional castings, and possess much biggerin starting grains grainscompared in the wrought alloy develop from conventional castings, and possess much bigger starting grains to the WAAM

Summary

Introduction

IN718 is a nickel-based superalloy used extensively in many sectors such as aerospace, automotive, marine, shipbuilding, petrochemical and energy for the manufacture of complex parts in which the material is subjected to an aggressive environment. Wire Arc Additive Manufacturing (WAAM) uses the arc as a heat source to fuse the wires, using a layer-by-layer method It is an economical method of rapid forming for the manufacture of high-quality metal parts. Plasma Arc Welding (PAW) is a high energy density process. The laves phase is generally deemed detrimental for mechanical properties, as its formation the matrix of Nb and its presence may have an embrittling effect on the material [11]. Still a lack of information available on the effect of laves phase on the mechanical properties of WAAM. The mechanical properties of WAAM materials at high temperatures are important. The microstructure, strength and fractography are studied, and the effect of precipitation (laves phase) on the mechanical yield strength, tensile strength and fractography are studied, and the effect of precipitation Phase) on the mechanical properties of IN718 is discussed

Experimental Procedure

Graphical

Microstructure Analysis

Microhardness

Tensile from

Fractography elevated temperature is shown in

Conclusions