Study on Friction and Wear Behavior of Inconel 625 Superalloy during Hot Extrusion

Abstract

Friction during the hot extrusion of Inconel 625 superalloy tubes causes severe wear of the mold and plays a decisive role in the quality of the workpieces. In this paper, a ball-to-disk method was utilized to investigate the tribological behavior of Inconel 625 using two different tribological pairs, i.e., GCr15 and Si3N4, at room and elevated temperatures. Friction coefficient, specific wear rate, and morphology of worn surfaces were systematically characterized. It was found that the friction coefficients for both tribological pairs generally increased as the testing temperature increased, while the specific wear rate increased firstly and then decreased with the rise of temperature. Along with the increasing sliding speed, the friction coefficient between Inconel 625 and Si3N4 decreased monotonically, while the specific wear rate increased firstly and then decreased. Under any given testing condition, the friction coefficient and specific wear rate of the Inconel 625 for Inconel/Si3N4 pair are less than those of the Inconel/GCr15 pair. The main wear mechanisms between GCr15 and Inconel 625 are adhesive and fatigue wear at all testing temperatures. The wear mechanisms between Si3N4 and Inconel 625 are adhesive and abrasive wear at room temperature but fatigue wear at 500°C. Our findings indicate that the use of ceramic molds in the hot extrusion of Inconel 625 may significantly improve the surface qualities of the product and reduce the wear of the mold.

Mechanical and tribological studies of sintered nickel-based ternary alloys

“…These lower COF may be attributed to the low particle bonding of the Ni-17Cr10W and Ni-17Cr10Ta alloy, as a result of the larger particle size of Ta and W. This indicates that a lower force is required for sliding to occur. In addition, the fluctuations in the COF may be due to the presence of asperities which are similar to reported findings (Wang et al , 2020a; Wu et al , 2020; Samuel et al , 2020). Figure 6(d) present the average COF of the sintered alloys, which indicates that the COF decreases as the applied load increases, a slight increase was observed at 30 N applied load.…”

“…The tribo-oxide layer is developed through the partial oxidation of plastic deformed wear debris by frictional heat generated from continuous sliding process. The occurrence of the tribo-oxide layer has helped to facilitate the reduction of wear activities by cladding the worn surface from further wear (Babalola et al, 2020a;Wang et al, 2020b;Mishra et al, Wear rate at varying loads for the sintered alloys frictional force is expected; this is followed by subsequent hardening of the compacted debris and a considerable amount of deformation on the worn surface at an increased sliding time. The deformation of the worn surface is evident through the presence of groovy and debris compaction patterns.…”

Effect of interfacial friction on wear behavior and microstructure during extrusion of Pure Nickel N6

“…The author has previously conducted some studies on the friction, wear and lubrication in the extrusion process of pure nickel and its alloys. These studies elucidated the in uence of the extrusion temperature and speed on the wear macroscopic morphology, friction coe cient and wear rate [24]. In the process of nickel alloy extrusion, when the interface friction is too large, the local grains of the billet will grow quickly, and in severe cases, this growth will directly cause the workpiece to burst [25].…”

Progressive Molecular Rearrangement and Heat Generation of Amorphous Polyethene Under Sliding Friction: Insight from the United-Atom Molecular Dynamics Simulations

“…Polymers undergo a variety of processing conditions in polymer-based advanced manufacturing such as micro/nanoinjection molding, , ultrasonic consolidation, , and ultrasonic plasticization, , where interfacial friction plays a crucial role in some critical phenomena. As an example, the single sliding friction (SSF) between the polymer bulk material and the barrel and the screw should be tailored to achieve a high mass flow rate in a single screw extrusion/injection molding machine. , The reciprocating sliding friction (RSF) among polymer particles is considered to be the primary heat source during ultrasonic consolidation . The rapid frictional heat is what sets the conditions for the materials to bind together.…”

“…As an example, the single sliding friction (SSF) between the polymer bulk material and the barrel and the screw should be tailored to achieve a high mass flow rate in a single screw extrusion/injection molding machine. 7,8 The reciprocating sliding friction (RSF) among polymer particles is considered to be the primary heat source during ultrasonic consolidation. 3 The rapid frictional heat is what sets the conditions for the materials to bind together.…”