Microstructures and machinability of the Inconel 182 overlays at different overlay thickness deposited by shield metal arc welding

Abstract

Nuclear steam turbines are well-known working in saturated wet-steam environment. The use of anti-corrosion material depositing or coating on the critical components and then machining to the required thickness with specific surface quality can be an effective and economical way to prevent critical components of steam turbines from corrosion and erosion. Inconel 182 can be this anti-corrosion material; however, a few literature has reported its machinability, not to mention its machinability at different overlay thickness. The objective of this study is to investigate the influence of the coated overlay thickness on microstructures and machinability of Inconel 182 overlays. First, the micro-hardness and microstructures of Inconel 182 overlays at different overlay thickness are studied. Afterwards, cutting forces, cutting temperature, surface roughness and the machined surface morphology at different overlay thickness are discussed. Finally, the prediction model for machining Inconel 182 overlays at different overlay thickness is established. The results indicate that the microstructures of Inconel 182 overlays strongly rely on overlays thickness and Inconel 182 electrode diameter (3.2 mm). The prediction model illustrates that the machinability of Inconel 182 overlays is acceptable at overlay thickness from about 0 to 2.1 mm; it is poor at overlay thickness from about 2.1 to 6.4 mm, and it is stable at overlay thickness from about 6.4 to 10 mm.

Characterization of mechanical behavior in repaired FC300 using directly deposited AISI-P21 and AISI-H13 metal powders

“…This makes the material within the repaired zone to become brittle, thereby generating significant amounts of carbon monoxide. [11][12][13][14][15] To overcome abovementioned issues, the additive metal-layer deposition (AMD) technique was investigated for use in the repair of casting parts. AMD has recently been considered as a promising method to be employed in the repair of mechanical parts owing to its inherent characteristics of high efficiency and flexibility, comparatively smaller extent of heat-affected zone (HAZ), and retention of strong metallurgical bonds between the base metal and deposited material.…”

“…This makes the material within the repaired zone to become brittle, thereby generating significant amounts of carbon monoxide. 11–15…”

Experimental Study on the Oxidation and Diffusion Behavior of Inconel 625 and Tool Materials

“…Several characteristics, including high toughness and ductility, high melting point, excellent resistance to corrosion, thermal shocks, thermal fatigue, and erosion are primarily responsible for its wide domain of application [2]. However, its low thermal conductivity, high strength, and high chemical reactivity limit its machinability [3]. The selection of tool materials for cutting Inconel 625 involves even higher requirements.…”