scholarly journals Effect of Fullerenes Additions on Physical – Mechanical Properties of Hot-Forged Iron-Based Powder Materials

2021 ◽  
Vol 877 (1) ◽  
pp. 012009
Author(s):  
Mohammed Qasim Kareem ◽  
Vladimir Dorofeyev
Keyword(s):  
Powder Material ◽  
Testing Machine ◽  
Hot Forging ◽  
Hardness Test ◽  
Carbon Steels ◽  
Powder Materials ◽  
Test Machine ◽  
Technological Parameters ◽  
Volume Weight ◽  
Iron Based

Abstract It is possible to expand the applications ranges of powder material products by enhancing the performance properties of these products in addition to their manufacturability and reliability together, it’s possible by materials structures modification. In this paper, the effect of fullerene (C60) additives to iron-based powder material has been studied. All samples produced by Hot-Forging (HF) powder materials technology. Green and HF density of the obtained samples calculated by volume / weight and Archimede’s principle, respectively. The effect of technological parameters on the microstructure of carbon steels’ samples was done by an ALTAMI MET-1M metallographic microscope. Tensile test executed by using of a universal testing machine UMM –5 and the microhardness (HV10) was measured by REICHERT hardness test machine. The results showed that the HF C60 steels’ samples had higher density and strength of 0.81 and 25%, respectively, with a good plasticity in comparison with graphite steels’ samples.

scholarly journals Calibration Of Vickers Hardness Test PT.Tenaris Seamless Pipe Indonesia Jaya Cilegon Using Standar Blok

2020 ◽  
Vol 64 (3) ◽  
pp. 81-87
Author(s):  
Dodi Dodi Sofyan Arief ◽  
◽  
Muftil Badri ◽  
M Dalil ◽  
Agus Reforiandi ◽  
...  
Keyword(s):  
Vickers Hardness ◽  
Testing Machine ◽  
Hardness Test ◽  
International Standards ◽  
Measuring Instruments ◽  
Test Machine ◽  
Hardness Testing ◽  
Diamond Pyramid ◽  
Vickers Hardness Test

A calibration is an activity to determine the conventional validity of the appointment value of measuring instruments and measuring materials by comparing them to standard measurements that are traceable to national and international standards for measurement units and or international and certified reference materials. The calibration is generally a process of adjusting the output or indication of a measurement device to match the magnitude of the standard used in certain accuracy. The purpose of this paper is to find out the vickers hardness test calibration whether the machine running normally or there is a problem with the device. A case study was conducted in PT. Tenaris SPIJ, Cilegon, Indonesia. A vickers hardness testing in the case study has its own reference standard, namely ISO 6507-2: 2018 Metal material - Hardness Test Verification and Calibration of the test machine. The vickers hardness test equipment is a machine to conduct tests using a diamond pyramid with a plane angle of 136°, by means of an emphasis by an indentor that results in a trace or indentation on the surface of the test object. The vickers hardness testing is abbreviated as HV or HVN and also known as Diamond Pyramid Hardness Test (DPH). Result of calibration in the case study was found the repeatability value on vickers hardness testing machine of 32 HV 10 and the error value of ±3%.

Effect of Powder Type and Particles Size on Microstructure of Selective Laser Sintered Parts

2019 ◽  
Vol 799 ◽  
pp. 252-256
Author(s):  
Simonas Mindaugas Jankus ◽  
Regita Bendikiene
Keyword(s):  
Powder Material ◽  
Selective Laser Sintering ◽  
Steel Powder ◽  
Powder Materials ◽  
Metal Powders ◽  
Defect Content ◽  
Fraction Size ◽  
Iron Based ◽  
Powder Type ◽  
Scanning Electron

The goal of this work was to investigate microstructure of the selective laser sintering (SLS) produced parts evaluating effect of powder type and fraction size. Studies have shown that printed samples of 316L and GP1 metal powders had a higher defect content compared to printed components from MP1 powder material. From scanning electron microscopy (SEM), it was found that iron-based printed parts melted worse than Co-Cr alloy components. Iron-based 316L and GP1 metal powders did not get enough energy from laser to perform a better microwelding between particles. Surface roughness Ra numerical values for samples 316L, GP1, MP1 respectively are Ra = 13.7 μm; 11.4 μm; 3.0 μm. Stainless steel powder material contains particles which size varies between 20 – 120 μm. The Co-Cr alloy and the maraging steel powder materials are made of 10 – 80 μm particles. The chemical and elemental composition of powder materials were examined using SEM-EDS technology.

Surface Durability of Spur Gears at Hertzian Stresses Over Shakedown Limit

1974 ◽  
Vol 96 (2) ◽  
pp. 359-372 ◽  
Author(s):  
Akira Ishibashi ◽  
Taku Ueno ◽  
Shigetada Tanaka
Keyword(s):  
Fatigue Testing ◽  
Testing Machine ◽  
Carbon Steels ◽  
Rolling Contact ◽  
Hertzian Contact ◽  
Load Testing ◽  
Short Period ◽  
Hertzian Contact Stress ◽  
Surface Durability ◽  
Shakedown Limit

Using a new type of gear-load testing machine and a disk-type rolling fatigue testing machine designed and made by the authors, the upper limits of Hertzian contact stress allowable on rolling contact surfaces were investigated. It was shown conclusively that gears and rollers made of soft carbon steels could be rotated beyond 108 revolutions at Hertzian stresses over shakedown limit (≈ 0.4 HB). In the case of gears, pits having a pitting area ratio of 0.04 percent occurred during 1.16 × 108 rotations at a Hertzian stress of 0.50 HB. However, no pitting occurred on the roller rotated through 1.20 × 108 revolutions at a Hertzian stress of 0.71 HB, although appreciable changes in texture were observed at the subsurface. In order to rotate gears or rollers at Hertzian stresses over shakedown limit, their surface must either be very smooth initially or after a short period of running, and an oil film must be formed between contacting surfaces.

Effective Porosity Comparison with a Lime Mortar Matrix Base during 350 to 700 Days

2017 ◽  
Vol 902 ◽  
pp. 60-64
Author(s):  
Judith Alejandra Velázquez Perez ◽  
Wilfrido Martínez Molina ◽  
Hugo Luis Chávez García ◽  
Elia Mercedes Alonso Guzmán ◽  
Rosalía Ruiz Ruiz
Keyword(s):  
Powder Material ◽  
Effective Porosity ◽  
Capillary Absorption ◽  
Powder Materials ◽  
Maize Starch ◽  
Lime Mortar ◽  
Historical Sites ◽  
Matrix Base ◽  
Weight Proportion ◽  
Mortar Matrix

This research is an investigation about the use of powder material additions with mortars lime base for a possible implementation in construction and/or restoration of historical sites. Mortars were elaborated in laboratory conditions with a 1:2.5 in weight proportion. One of the proofs to which these mortars were submitted was the test of capillary absorption; this way, the influence of the materials added to powder in these mortars determined porosity. Mortars were made with different percentages of materials. These powder materials are brick manufacturing ash, quarry powder, clay and maize starch. The test was run during 350 to 700 days. It obtained better results with 700 days than with 350 days.

scholarly journals Effects of temperature and impactor nose diameter on the impact behavior of PA6 and PP thermoplastic composites

2018 ◽  
Vol 51 (1) ◽  
pp. 64-74 ◽  
Author(s):  
Akar Dogan ◽  
Yusuf Arman
Keyword(s):  
Load Capacity ◽  
Testing Machine ◽  
Polyamide 6 ◽  
Impact Testing ◽  
Impact Behavior ◽  
Thermoplastic Composites ◽  
Test Machine ◽  
Effects Of Temperature ◽  
Impact Energies ◽  
The Impact

In this study, the effects of temperature and impactor nose diameter on the impact behavior of woven glass-reinforced polyamide 6 (PA6) and polypropylene (PP) thermoplastic composites were investigated experimentally. Impact energies are chosen as 10, 30, 50, 70, 90, 110, 130, and 170 J. The thickness of composite materials is 4 mm. Impact tests were performed using a drop weight impact testing machine, CEAST-Fractovis Plus, and the load capacity of test machine is 22 kN. Hemispherical impactor nose diameter of 12, 7, and 20 mm were used as an impactor. The tests are conducted at room temperature (20°C and 75°C). As a result, the PP composites of the same thickness absorbed more energy than PA6 composites. The amount of absorbed energy of PP and PA6 composites decreased with temperature.

scholarly journals Evaluation of Physicochemical Parameters of Piroxicam 20 mg Tablets Commercially Available in District Larkana, Sindh

2020 ◽  
pp. 82-87
Author(s):  
Waqar Ahmed ◽  
Muhammad Ali Ghoto ◽  
Ubed-ur-Rehman Mughal ◽  
Abdullah Dayo ◽  
Mudassar Iqbal Arain ◽  
...  
Keyword(s):  
Powder Material ◽  
Physicochemical Parameters ◽  
Research Study ◽  
Hardness Test ◽  
Test Diameter ◽  
Chemical Test ◽  
Unsatisfactory Result ◽  
Qualitative Research Study ◽  
Weight Variation

The objective of this study is to evaluate the physicochemical parameters of Piroxicam 20 mg Tablet brands. A comparative qualitative research study was conducted for a period of six months. A total of five different brands of active Piroxicam tablets were selected. All samples were purchased from various local markets of Larkana Sindh. These collected samples were coded as PIX01, PIX02, PIX03, PIX04 and PIX05 for minimalism. Specific physicochemical quality control lab tests included Aesthetic test, Diameter and Thickness test, Weight variation, Mechanical strength and Friability test were performed on each sample according to standards and results were compared. Packing of all samples was observed according to GMP guidelines. Data was analyzed by using statistical software SPSS 24.00. Most of the brands were within official limits of United State Pharmacopeia (USP) except brand PIX05 showing variation in hardness test, whereas two brands PIX03 and PIX05 fail in friability test as well as powder material seen inside of blisters in aesthetic test. Dissolution test for each brand of Piroxicam was performed in which PIX02, 04 and 05 failed. It was concluded that from this study after in vitro physical evaluation of various brands of Piroxicam tablets, most of the brands are being manufactured under compliance of GMP guidelines as well as specifications described under USP. Traces of powder material inside of blister in aesthetic test and unsatisfactory result in friability and hardness test in same brand indicating the deviation of GMP guidelines and USP specification which may cause the out of specification result in chemical test.

scholarly journals X-RAY SPECTRAL MICROANALYSIS OF ELECTROEROSIVE POWDER MATERIAL OBTAINED IN AN ETHYL ALCOHOL MEDIUM FROM WASTE OF A NON-TUNGSTEN HARD ALLOY OF THE KNT16 BRAND

2020 ◽  
pp. 33-36
Author(s):  
E. V. Ageeva ◽  
B. N. Sabel’nikov
Keyword(s):  
Hard Alloy ◽  
Powder Material ◽  
Ethyl Alcohol ◽  
Scientific Research ◽  
Powder Materials ◽  
Hard Alloys ◽  
Processing Waste ◽  
Resource Saving ◽  
X Ray ◽  
Alcohol Medium

The first appearance of tungsten-free hard alloys (TFHA) was noted in the early 30s of the last century, but they did not receive due attention and, accordingly, spread due to insufficient strength and were replaced by tungsten-containing alloys of such groups as VK, TC and TTK. However, the rapidly developing shortage of expensive tungsten pushed in the late 50s to return to the search for hard alloys, the composition of which does not include tungsten. Due to the growing demand for tungsten-free hard alloys, the problem of recycling their waste with the possibility of reuse is acute in the industry. The purpose of this work was to conduct x-ray spectral microanalysis (RSMA) of powder material (PM) obtained by electroerosive dispersion (EED) in ethyl alcohol from waste of a non-tungsten hard alloy of the KNT16 brand. The resulting powder material was examined using an energy-dispersion x-ray analyzer from EDAX, built into a scanning electron microscope "QUANTA 600 FEG". In the course of scientific research, the spectra of characteristic x-ray radiation on the surface of the experimentally obtained sample were obtained. The results obtained in the course of scientific research can be used to create environmentally friendly resource-saving processes for processing waste of tungsten-free hard alloys into powder materials.

scholarly journals METHOD OF SAMPLE MANUFACTURING FROM MULTILAYER COMPOSITE MATERIALS FOR STUDYING THEIR MECHANICAL PROPERTIES

2018 ◽  
pp. 16-23
Author(s):  
Alsaid Mazen ◽  
Ali Salamekh
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Polymer Composite ◽  
Testing Machine ◽  
Physical And Mechanical Properties ◽  
Polymer Composite Materials ◽  
Technological Parameters ◽  
Cutting Out ◽  
Method Of Production ◽  
Economic Considerations

In the last decades there is increasing the need to apply polymer composite materials in different industries, particularly in shipbuilding. There are developing single structures made from polymer composite materials to be used on board ships. The article focuses on technology of manufacturing slabs from polymer composite materials to carry out mechanical testing in the laboratory special standard units. Mechanical properties of polymer composite materials depend on molding technologies. There has been described a technology of sample manufacturing from polymer composite materials reinforced with glass fiber mat with fiberglass plastics. The technique of testing the specified samples for tensile strength has been considered. The sizes and shapes of the samples as well as the technological parameters of the manufacturing process have been validated, depending on the standard requirements and the technological features of the testing machine. The physical and mechanical properties of the components that make up the composite materials are considered. The sequence of stacking layers for preparation of plates from composite materials is indicated. The dimensions of the plates for cutting out finished samples are determined, depending on the method of production. The way of laying plates from composite materials has been chosen on the base of economic considerations and conditions of accessibility. The obtained results of mechanical properties can be used in solving problems of application of polymer composite materials in shipbuilding, for example, in manufacturing superstructures of some dry cargo vessels.

Cavitation resistance of iron-based powder materials

1988 ◽  
Vol 27 (10) ◽  
pp. 805-809
Author(s):  
O. V. Evtushenko ◽  
S. M. Chernega
Keyword(s):  
Powder Materials ◽  
Cavitation Resistance ◽  
Iron Based
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