Solid State Processing of Metals and Composites: Session I
Program Organizers: Ajay Kumar, Indian Institute of Technology Tirupati; Pradeep Menezes, University of Nevada, Reno; Satish Kailas, Indian Institute of Science (IISc), Bangalore; N Venkaiah, Indian Institute of Technology Tirupati; Venkata Kiran Degala, Indian Institute of Technology Tirupati
Wednesday 2:00 PM
November 4, 2020
Room: Virtual Meeting Room 19
Location: MS&T Virtual
Session Chair: Degala Kiran, Indian Institute of Technology (IIT), Tirupati; N. Venkaiah, Indian Institute of Technology (IIT), Tirupati
2:00 PM
Surface Modification of Supersonic Particle Deposited 316L Stainless Steel through Friction-Stir Processing: Alessandro Ralls1; Pradeep Menezes1; Prasad Kalvala1; Ashish Kasar1; Pankaj Kumar1; Manoranjan Misra1; Mohammadreza Daroonparvar1; 1University of Nevada, Reno
The aim of this work is focused on investigating the effects of friction stir processing (FSP) on supersonic particle deposited (SPD) 316L stainless steel. Prior to FSP, the SPD samples were subjected to annealing at 1000 °C mitigating the residual stresses developed on the sprayed alloy. The FSP was performed with using molybdenum tool at rotational speeds of 800 and 1400 rpm. The effect of FSP was analyzed in terms of change in microstructure, mechanical and tribological properties. The FSP zone of both samples exhibited an equiaxed smaller grains due to dynamic recrystallization whereas the following affected layers showing more of a lamellar grain structure. The microstructure also confirms reduction in pores. These reductions in grain size and pores led to improvement in mechanical and tribological properties. The study also suggests that potential of FSP process to tailor the properties of additively manufactured metals and alloys.
2:20 PM
7075 Aluminum Graphene Composites Made by Shear Assisted Processing and Extrusion: Xiao Li1; Xiaolong Ma1; Dalong Zhang1; Timothy Roosendaal1; Angel Ortiz1; 1Pacific Northwest National Laboratory
Aluminum alloys are widely used in automobile and aerospace industrial thanks to its high strength-to-weight ratio. Aluminum Graphene composite is one of the promising composites material with improved strength, fracture toughness, and electrical conductivity. However, the current manufacturing processes have challenging to uniformly distribute graphene in the metal matrix. The high processing temperature also degrades graphene through oxidation or decomposition. In this study, Shear Assisted Processing and Extrusion (ShAPE), a solid state processing, is used to make 7075 graphene composite. The high shear deformation strongly stirred the aluminum alloy and dispersed the graphene homogenously in the matrix. The processing temperature is as low as 350oC which well-maintained the quality of the graphene by avoiding oxidation and carbide formation. Compared to 7075-T73 condition, the as-extruded sample has improved ductility 100% with the same ultimate strength. SEM and TEM show the graphene is distributed on the grain boundary and attached with precipitates.
2:40 PM
Development of Spare Parts and Components for Aerospace Engineering out of Heavily Deformed Steels: Valeriy Mishchenko1; Anna Ben2; Anton Matiukhin2; Vitalii Shyrokobokov2; Sergey Sheyko1; Elena Kulabneva2; 1Zaporizhzhia National University; 2National University "Zaporizhzhia polytechnic"
A method of obtaining turbine disks of gas turbine engines (GTE) by isothermal stamping in the shell, which is a complete substitute for cost analogues, is proposed. Further studies of deformation conditions in QForm have been carried out. The application of technology allows obtaining a homogeneous fine-grained structure by volume of the workpiece. Keywords:Hot stamping, heavily deformed alloys, isothermal stamping, sheath, turbine disc, gas turbine engine.
3:00 PM
Evaluation of Factors of Cold Plastic Deformation Influence on the Increase of Mechanical Properties of the Shaving Steel for a Milling Cutting Tool: Valeriy Mishchenko1; Anton Matiukhin2; Anna Ben2; Vitalii Shyrokobokov2; Sergey Sheyko1; Elena Kulabneva2; 1Zaporizhzhia National University; 2“Zaporizhzhia Polytechnic” National University
The effect of cold volumetric stamping on the mechanical properties of P6M5 (HSS) high speed steel was investigated in the study of the technology of the tap production in the radial stamping machine. The use of plastic deformation in the technology of manufacturing taps leads to an increase in the mechanical and technological properties of High Speed Steel.Keywords: plastic deformation, cold volumetric stamping, radial stamping machine, tap, high-speed steel.
3:20 PM
Solid State Joining of Dissimilar Ni-based Superalloys via Field Assisted Sintering Technology for Turbine Applications: Charis Lin1; Namiko Yamamoto1; Derek King2; Jogender Singh1; 1The Pennsylvania State University; 2UES, Inc.
Current methods to join nickel-based superalloys of dissimilar microstructures, such as friction welding and cold metal transfer, lead to localized melting and a heat affected zone, compromising the microstructure and mechanical properties of the parent materials. In this work, Field Assisted Sintering Technology (FAST) is studied as an alternative method to diffusion bond the dissimilar nickel-based superalloys CM247LC and Inconel 718. Microstructures at the bonding region will be studied, and mechanical properties such as hardness, elastic modulus, and tensile strength will be compared to that of the parent materials. Preliminary results suggest that diffusion bonding using FAST leads to an interface free of major defects without producing a heat affected zone (HAZ); electromigration during the FAST process may lead to enhanced diffusion, and sintering temperatures below the melting point may eliminate HAZ formation.