Effect of Annealing Temperature on Tensile Properties of Inconel 600

Inconel 600 is a well-known material for high temperature application. Therefore, the study on the effect of annealing to the microstructure and material properties was very important. In this research, Inconel 600 was heat treated at various annealing time and temperature. The aim of the study is to investigate the behavior of Inconel 600 when subjected to annealing temperatures in the range of 600⁰C-1100⁰C for 1 and 2 hours. The samples were prepared for heat treatment and tensile testing. Appropriate metallographic techniques were introduced to study the variations in grain size and material behavior of Inconel 600. The results were compared with as-received material. The analysis correlates the grain growth with time and temperatures. The size of the grains increases dramatically in the temperatures ranging from 1000⁰C-1100⁰C. The relation between tensile strength and grain size is inversely proportional and the solvus temperature of Inconel 600 alloy was identified to be occurred in the range of 1000⁰C-1100⁰C

Vacuum brazing of sapphire with Inconel 600 using Cu/Ni porous composite interlayer for gas pressure sensor application

In this research, sapphire as a ceramic was brazed to Inconel 600 as a metal with a commercially available Cusil ABA (63Ag-1.75Ti-35.25Cu) filler foil as braze alloy where Cu/Ni porous composite introduced as an interlayer so it could be used in a particular gas pressure sensor application. Several brazing processes were carried out in a high vacuum furnace in order to investigate the effects of brazing parameters on the joint interface and mechanical properties. The common brazing temperature and time were in the ranges of 830-900°C and 15-30min respectively, while vacuum pressure was remained constant at 1×10Pa. SEM-EDS and XRD analyses of the joint microstructure and interface composition revealed five distinct phases; NiTi, AlNi, CrTi, FeNiTi (TiO). The brazing area formed two "ocean" structures near to Inconel and sapphire interfaces whereas a reaction layer was developed at the surface of Inconel 600. Under the mechanical property analyses the brazed joint at 900°C for 30min obtained the maximum shear strength of 58.5MPa which is adequate for particular gas pressure sensor application

Effect of brazing temperature on the shear strength of Inconel 600 joint

In this study, Inconel 600 alloy was brazed by using Cusil ABA which is an active filler alloy in a high-vacuum condition under a pressure of 1×10 Pa. Three brazing temperatures (830, 865, and 900 °C) were chosen based on the solidus temperature of AgCuTi filler alloy in order to investigate the effects of these temperatures on the performance of the brazed joint. Brazing processes were carried out over a period of time (15 min) to ensure that the filler alloy was melted completely. The performance of the brazing process was evaluated in terms of bonding strength by shear test, whereas microstructural analysis was performed to investigate the bonding morphology. The results revealed that a maximum value of shear strength (223.32 MPa) was obtained at a brazing temperature of 865°C compared with other temperatures. It was also observed morphologically that the highest shear strength was influenced by the formation of two reaction layers that crossed in the center of the brazed area due to interdiffusion effect of several constituents from the Inconel 600 alloy and active brazing filler

Improvement of Methadone Maintenance Treatment (MMT) Process Through Development and Implementation of Methadone Dispenser

Methadone is a controlled drug and can be prescribed by an authorized person in charge, under the direction of medical practitioners, for particular patients, to cure their addiction to opioid substances. The development and evaluation of a methadone dispenser present a prototype solution for solving the current manual methadone dispensing problems, which are prone to human error, with the implementation of the methadone maintenance treatment (MMT) program at the same time to increase public awareness about this program. In the current study, the performance of a methadone dispenser is evaluated by investigating the simulation analysis, feasibility, and efficiency of the device as compared to the manual technique. For testing purposes, methadone syrup was replicated with sugar solution of 66.6 g/50 mL at 25°C with a dynamic viscosity of 36.680 mPa.s. Thus, it was quantified that the time taken to dispense the sugar solution by using the methadone dispenser has shown a significant improvement of 81.40 % time reductions as compared to the manual technique. The low repeatability percentage of the methadone dispenser by 1.64 % contributes to a high precision device that is reliable enough to be implemented in the MMT program with a dispensing accuracy increment of 3.87 %, as compared to the manual technique. The findings suggest that the methadone dispenser is reliable and feasible and contributes to error reduction for implementation in the MMT program with approximately ≈ 97 % efficiency. © 2019 by ASTM International

Experimental investigation of nucleate pool boiling heat transfer characteristics on modified copper surface via laser-structured microstructures

This study aims to evaluate the performance of boiling heat transfer on a structured surface subjected to constant heat flux. A nanosecond laser ablation was used to create different surface profiles on copper samples. Specifically, a series of step-like microstructured surfaces with varying secondary groove widths were fabricated to investigate their effect on nucleate pool boiling heat transfer performance of distilled water. The results indicated a significant enhancement in heat transfer performance for the laser structured surfaces compared to the smooth surface at low heat flux. This improvement was attributed to the increased nucleation frequency, surface area, and nucleation site density. However, at higher heat flux, the surface with a smaller secondary groove width (LS 2) exhibited a decline in heat transfer performance, which was likely due to larger bubble escaping resistance. In contrast, the surface with a larger secondary groove width (LS 1) demonstrated the best heat transfer performance. The current work would help in finding an optimum surface structuring design for gaining higher boiling heat transfer performance which benefits industries dealing with thermal management processes

Proceedings of International Technical Postgraduate Conference 2022

This conference proceedings contains articles on the various research ideas of the academic & research communities presented at the International Technical Postgraduate Conference 2022 (TECH POST 2022) that was held at Universiti Malaya, Kuala Lumpur, Malaysia on 24-25 September 2022. TECH POST 2022 was organized by the Faculty of Engineering, Universiti Malaya. The theme of the conference is “Embracing Innovative Engineering Technologies Towards a Sustainable Future”.  TECH POST 2022 conference is intended to foster the dissemination of state-of-the-art research from five main disciplines of Engineering: Electrical Engineering, Biomedical Engineering, Civil Engineering, Mechanical Engineering, and Chemical Engineering. The objectives of TECH POST 2022 are to bring together innovative researchers from all engineering disciplines to a common forum, promote R&D activities in Engineering, and promote the dissemination of scientific knowledge and research know-how between researchers, engineers, and students. Conference Title: International Technical Postgraduate Conference 2022Conference Acronym: TECH POST 2022Conference Date: 24-25 September 2022Conference Location: Faculty of Engineering, Universiti Malaya, Kuala Lumpur Malaysia (Hybrid Mode)Conference Organizers: Faculty of Engineering, Universiti Malaya, Kuala Lumpur, Malaysia