Investigating Inconel 625: Mechanical and Microstructural Changes Under Wire-Arc Additive Manufacturing

Abstract

Abstract A production method used to 3D print or repair metal objects is referred to as wire arc additive manufacturing (WAAM). It belongs to a group of Additive Manufacturing (AM) techniques known as Direct Energy Deposition (DED). To form a desired 3D shape, layers of metal are deposited on top of one another in WAAM.In the scope of WAAM, Mechanical and Microstructural (MM) changes refer to modifications that take occurred within a material's characteristics and structures during the AM process.An in-depth analysis of the changes that WAAM makes on the MM of Inconel 625 (I-625), a superalloy made of nickel.In this study, the fabrication of I-625 alloy utilizing Cold Metal Transfer (CMT)-WAAM (CMT-WAAM) has been analyzed. The specimen's layers varied in microstructure, according to microstructural examinations, with the lowest layer being composed of minute primary cellular grains.The typical microhardness of the manufactured specimen marginally increased from 255 HV to 259 HV with an increase in Travel Speed (TS), according to mechanical parameters that include hardness and tensile qualities.The development in yield strength (YS), which starting 650 MPa to 690 MPa, and ultimate tensile strength (UTS), which goes beginning 380 MPa to 408 MPa.The CMT-WAAM technique was used to build the components, and the results revealed that each had mechanical performance superior to that of I-625 alloy casting parts, except UTS. This proved that I-625 alloys could be produced using the CMT method.