Journal of Metallic Material Research

Analysis of the Geometry of Wear Tracks in Laser Deposited Stellite 6 Coatings

Alain Kusmoko, Huijun Li, Druce Dunne — Sat, 27 Jan 2024 00:00:00 +0800

A model has been developed to predict the wear groove geometry resulting from wear testing of Stellite 6 coatings on ferrous and nickel-based alloys produced by laser cladding with powers of 1 kW and 1.8 kW. Although the predictions of the model are close to the observed values, they differ in ways that can be accounted for by the incorrect assumption that only abrasive wear occurs. Abrasive wear is dominant, but there is also evidence that adhesive wear and plastic deformation occur and change the geometry and macrostructures of the wear tracks, particularly for the coatings on a Ni-based superalloy substrate. Significant differences were observed in wear track geometries and macrostructures for coatings on the substrates investigated and these differences correlate well with measured differences in the wear loss of the Stellite coatings.

Topology Optimization of Finite Periodic Structures with Compliance and Frequency Criteria

Chuanqi Zhu — Fri, 20 Sep 2024 00:00:00 +0800

Periodic structures effectively address challenges in manufacturing, transportation, and installation of large-scale systems by streamlining processes and enhancing transport, replacement, and assembly efficiency. This paper introduces a topology optimization method specifically for cantilever beam structures, to minimize structural flexibility and optimize frequency by determining the optimal material distribution under given loads and constraints. The study explores continuum periodic structures, examining the effects of material properties, optimization parameters, and boundary conditions on the outcomes. Various aspects of periodic optimization design, such as structural configuration, connections, and layout, are also investigated. Through the application of topology optimization using SolidWorks and Ansys, the experimental results validate the method’s effectiveness in enhancing structural performance and material utilization. This research presents a systematic approach and highlights the practical potential of designing periodic structures.

Photopolymer-metal Composites Based on Metal Foil Deposition on Additive Manufactured Substrates: An Overview

Sagar K G — Thu, 21 Dec 2023 00:00:00 +0800

Photopolymer materials are a type of polymer material that can undergo chemical reactions when exposed to light of a specific wavelength or intensity. Liquid photopolymers are used in applications such as 3D printing, where they are deposited layer by layer and cured by exposure to light. Solid photopolymers, also known as photoresists, are used in applications such as lithography and microfabrication, where they are applied as a thin film and selectively exposed to light to create a pattern. The properties of photopolymer materials, such as mechanical strength, thermal stability, and chemical resistance, can be tailored by adjusting the monomer type, photo initiator type, and processing parameters such as the exposure time and intensity. Overall, photopolymer materials are a versatile and widely used type of polymer material that can be tailored for specific applications through the choice of monomer, photo initiator, and processing parameters. Photopolymer-metal composites based on metal foil deposition on additive manufactured substrates are a technique for creating composite materials with a combination of metal and polymer properties. This approach involves the deposition of a thin layer of metal foil onto a 3D printed polymer substrate, which is then cured using photopolymerization to create a composite material with unique properties.