The Department of Materials Engineering at the University of Technology awarded a master’s degree to the student Sara Mohamed Kamel, Department of Materials Engineering/ University of Technology, for his thesis  titled  (Studying Microstructure and Mechanical Properties of Alloy Steel Weld Joint of Boiler Tubes Power Plant)

The discussion was held on the discussions hall / building B / Department of Materials Engineering / University of Technology on Sunday  (09/10/2022). The discussion committee was formed of the teaching staff listed:

As well as the scientific evaluation of the thesis by a Asst. professor. Hussein Ibrahim Khalaf/ Basra University/ College of Engineering/ Mechanical Engineering Department, and Asst. Prof. Naseer Hamed Farhoud/ University of Technology/ Department of Electromechanical Engineering, and linguistically by Asst.  Prof. Khaled Khudair Abbas/ University of Technology/ Department of Materials Engineering.

After the discussion committee made their remarks and observations on the thesis, which were divided between explanation, correction and the student’s defense of her message and the discussion ended, the committee decided to evaluate the thesis, and decided to grant the student a master’s degree with a Pass grade

Abstract

The thesis aimed to study the mechanical properties and microstructure of welded tubes (similar and dissimilar welding).(T22-T22),(T91-T91),(T91-T22)  by using different filler metals (ER90S-B3,ER90S-B9,ERNiCr-3) used in steam boilers in electric power plants. The welding process (GTAW) was carried out for the pipes, taking into account the heat treatment before welding and after welding and the (purging process for root pass only) by argon gas. Also, six tests were conducted to examine the microstructure, mechanical properties and effectiveness of the weld, which include: radiography, optical microscopy, electron microscopy (SEM), energy dispersive spectroscopy (EDS), hardness test (HV), tensile test at high temperature ( 550) degrees Celsius to simulate the real conditions of the pipes inside the boiler. The results of the work in the similar welding (T22-T22) showed that when using the filler metal (ER90S-B3), the highest tensile strength (419 MPa) was obtained with elongation (20%) compared to the other sample when using filler metal (ERNiCr-3), tensile strength (379 MPa) with elongation (21%) was obtained. The highest hardness value (230 HV) was obtained in (HAZ of T22) in dissimilar welding when using filler metal (ER90S-B3) compared to other samples when using filler metal (ERNiCr-3) was obtained (205 HV), and when using filler metal (ER90S-B9) was (206 HV). Also, the tensile test showed that the fracture site of the samples it varies with the filler metals used. The efficiency of the welded samples was also extracted, and the efficiency was (100%) for all welds with similar and dissimilar welding.

The Department of Materials Engineering at the University of Technology awarded a master’s degree to the student Ahmed Abdel Amir Jaseb, Department of Materials Engineering/ University of Technology, for her tagged thesis (Preparation Ni-Ti alloy nanofiber to improve Portland cement)

The discussion was held on the discussions hall / building C / Department of Materials Engineering / University of Technology on Sunday (09/10/2022). The discussion committee was formed of the teaching staff listed:

The dissertation was scientifically evaluated Prof. Dr. Kazem Kamel Rasan/Al-Mustansiriya University/College of Engineering/Department of Materials Engineering, and Prof. Dr. Shehab Ahmed Zidan/ University of Technology/ Department of Applied Sciences, and linguistically by Asst.Prof. Dr. Jamal Jalal Dawood/ University of Technology/ Department of Materials Engineering.

 The discussion of the dissertation was conducted in a scientific atmosphere and a master's degree with grade of pass was awarded to the student after the completion of all the corrections that have been decided by the examiners.

 Abstract

This research aims to prepare PVA/NiTi composite nanofibers by electrospinning technique, using a new method to produce NiTi nanoparticles (by assaying the NiTi alloy produced by sintering using a vacuum furnace )by laser, as NiTi nanoparticles were used in the electrospinning process.  .  The resulting NiTi nanoparticles were analyzed by X-ray diffraction (XRD), (SEM), these fibers were added to Portland cement and the compressive and bending properties were examined and it was noted that the addition of fibers led to a positive improvement in the compressive strength of the cement.

The Department of Materials Engineering at the University of Technology awarded a master’s degree to the student Tammar Falah Mohi , Department of Materials Engineering/ University of Technology, for his thesis  titled  (Investigation of Hybrid Composites reinforced with Natural Materials for Industrial Applications)

The discussion was held on the discussions hall / building C / Department of Materials Engineering / University of Technology on Thursday  (06/10/2022). The discussion committee was formed of the teaching staff listed:

The dissertation was scientifically evaluated by Prof. Dr Ali Hussein Muhammad/ Al-Nahrain University/ College of Mechanical Engineering, and Prof. Dr. Zainab Nayef Rashid/ University of Technology/ Department of Applied Sciences, and linguistically by Prof. Jamal Jalal Dawood/ University of Technology/ Department of Materials Engineering.,.

The discussion of the dissertation was conducted in a scientific atmosphere and a master's degree with grade of pass was awarded to the student after the completion of all the corrections that have been decided by the examiners.

Abstract

In this study, hybrid composite materials were manufactured using the hand lay-up technique, where epoxy was used as a matrix material and two types of reinforcement were glass fibers and particles of natural material (tamarind seed particles (TS)(  and coffee bean particles (CS)). The mechanical and physical properties of these composite materials were studied. Also, these materials were characterized by using Fourier Transform Infrared FTIR, Differential Scanning Calorimetry DSC, and Field Emission scanning electron microscopy FE-SEM. Because of the natural material's high moisture sorption, it was chemically treated with (NaOH).

The results showed that the mechanical  properties improved by increasing the weight percentages of TS and CS, when compared with pure epoxy and (epoxy +glass fiber), and the percentage (20 wt%) of both natural particles.

physical propertites improved by increasing the weight percentages of TS and CS (density, thermal conductivity, and acoustic insulation)

DSC characterization revealed an increased glass transition temperature value with increasing both natural particle weight fractions.

From FE-SEM results, it is clear that the fracture pattern became ductile after adding chemically treated natural particles. Furthermore, these treated naturals led to increased surface roughness and interfacial adhesion of hybrid composites, in addition to homogenous dispersion of particles within the matrix.

On the university of technology’s football championship for teching staff materials department team defeated the computer science team 3-0 in match was held on Monday 10/10:/ 2022 in the university football Field at 9:30 am.