Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Micro Hardness

Image Processing Evaluation of LSP Effect on the Corrosion Rate for the 304 Alloy

Raghad N. Salman; Razi J Al-azawi; A. Kadhim

Engineering and Technology Journal, 2023, Volume 41, Issue 8, Pages 1-10
DOI: 10.30684/etj.2023.136032.1294

The purpose of the study is to inhibit the corrosion rate using the (LSP) laser shock processing technology with an ND-YAG laser utilizing the Q-switched technique with a wavelength of 1046 nm for stainless steel 304 alloy. Laser shock processing (LSP) is a novel surface treatment approach for strengthening metal materials that use a high peak power, a brief pulse, and cold hardening. The laser parameters’ effect includes laser pulse energy and pulse repetition rate on the surface properties. The qualities of sample surfaces were investigated, including surface roughness and micro-hardness. The X-ray fluorescence technique was used to analyze the chemical composition of this alloy. The corrosion rate was measured using the polarization method. In particular, pitting corrosion was the option we picked. According to the findings, laser shock processing appears to considerably boost the micro-hardness of the LSP-treated sample. The corrosion causes a decrease in the rate. The result revealed that the corrosion current density was decreased, and the corrosion potential was shifted when the laser pulse energy and the pulse repetition rate were increased. When the laser energy was 920 mj and the pulse repetition rate was 6 Hz, we discovered the lowest rate of corrosion. Digital images are usually achieved by changing continuous signals to digital format. Many factors can affect the quality of an image, such as knowledge requirements, causing noise, low contrast, and badly-defined boundaries, among others. Specifically, we compared the results with those of the image processing.

Effect of laser Peening on the Microhardness and Roughness of Al-7277 alloy

Mays O. Hashim; Abdul Hadi K. Judran; Razi J. Al Azawi

Engineering and Technology Journal, 2019, Volume 37, Issue 10A, Pages 404-407
DOI: 10.30684/etj.37.10A.4

The purpose of the study conducted was an analysis of the influence of pulse density per area unit of LSP on (7277AL Alloy) regarding the surface characterization, roughness achieved and microhardness. The samples, which were used in this investigation, are 7277Al Alloy. Specify the laser parameter used in this study effect on sample surface properties were studied. Such as laser energy, and laser pulses number the results reveal that the microhardness enhancement by 80%, while the surface roughness increased by 69% when laser energy of 360mj and the number of laser pulses of 100 pulse were applied. X-ray fluorescence analyses and optical microscope were carried out for all samples.

Effect of Nano TiO2 Additives on Some Properties of Out Door Building Unites

Alaa A. Abdul-Hamead; Shatha R. Ahmed Izzat

Engineering and Technology Journal, 2016, Volume 34, Issue 13, Pages 2398-2405
DOI: 10.30684/etj.34.13A.3

In this paper a lower ratio of two powders; nano and micro titanium dioxide (TiO2) powder were used as additive in fabrication of mortar. Particle size of TiO2 powder were (80nm,1.6µm). These powders were used as additive to the mortar material (0.05, 0.1, 0.15 %) by cement weight in order to be used in construction application include layering building, and studies its effect on the mortar.
Inspections of the mortar specimens including optical microscope, surface roughness, micro hardness as well as x-ray diffraction (XRD).
Results demonstrate that surface roughness was diminished with augmentation of Nano TiO2powder added more than micro TiO2powder substances, while micro hardness was increased by raising the option of Nano TiO2powder to the mortar more than micro TiO2powder. Also, the mortar microstructure with the Nano TiO2 powder has been enhanced more than micro TiO2powder, with increment in CSH phase, which make the development of mortar with TiO2 Nano material useful and have a promising future in cutting edge development application.

Characterization of Nano Powder Incorporated for Building Applications

Alaa A. Abdul-Hamead; Farhad M. Othman; Mustafa M .Salih

Engineering and Technology Journal, 2015, Volume 33, Issue 6, Pages 1027-1039

In this paper Nano powders were used a mono; copper oxide CuO and di metal oxides powder; titanium dioxide (TiO2) in fabrication of mortar. Powder particle size about (67.8 nm) for TiO2 and (55.7nm) for CuO with crystal structure tetragonal and monoclinic system respectively have been used. These Nano powders were used as additives to the mortar material (0.5, 2.5, 5, 7.5 wt %) in order to be used in construction application including covering building, and studies on these mortar. Investigation was done on the mortar including XRD, AFM, optical microscopy, physical and some mechanical properties, micro hardness and wear rate). Results shows that where there an increase in micro hardness and decrease in wear rate in the mortar with the addition of Nano powder. Also be reduced Ca(OH)2 soft crystals and formation fine grains structure and homogeneous and the abolition of flaws or cracks. And the mortar with the Nano addition has been improved, which make the addition of Nano material beneficial and have a promising future in modern construction application.