Effect of Drilling Conditions on Microwave-Metal Discharge during Microwave Drilling of Stainless Steel

2019 ◽  
Vol 895 ◽  
pp. 253-258 ◽  
Author(s):  
Anurag Singh ◽  
Apurbba Kumar Sharma
Keyword(s):  
Stainless Steel ◽  
Plasma Channel ◽  
Microwave Energy ◽  
Metallic Materials ◽  
Channel Diameter ◽  
Time Compression ◽  
Experimental Trials ◽  
Drilling Conditions ◽  
Drilling Time ◽  
Microwave Applicators

Processing of metallic materials using microwave energy offer benefits of time compression and energy saving during applications such as sintering, casting, melting, joining and cladding. However, use of microwave energy is uncommon for machining of metallic materials because of high reflectivity. The present work aims to study microwave-metal (MW-m) discharge-induced plasma channel (PC) characteristics during microwave drilling of thin stainless steel (SS) sheet (0.6 mm) at 2.45 GHz. Experimental trials inside two different microwave applicators A1 and A2 were monitored and recorded. The images of the plasma channel generated in both the microwave applicators were obtained at different time intervals to analyze the plasma channel diameter (PCD). Experimental results revealed that variation in the microwave power significantly affects the dimension of plasma channel generated in the tool-work gap and heat affected zone (HAZ) formed around the drilling zone. Reduction in microwave drilling time of approximately 80% was observed at 3 kW power compared to drilling time at 0.7 kW power. The HAZ observed in the samples drilled at 0.7 kW was significantly higher than the HAZ observed at 3 kW owing to higher drilling time of samples at 0.7 kW.

Investigation of Carbon Dioxide Based Blasting Technologies as Cryogenic Deburring Method for Titanium Alloy and Stainless Steel

2018 ◽  
Vol 882 ◽  
pp. 142-153
Author(s):  
Daniel Gross ◽  
Andrea Heinz ◽  
Sven Amon ◽  
Trixi Meier ◽  
Ralf Schmand ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Stainless Steel ◽  
Titanium Alloy ◽  
High Speed ◽  
Metallic Materials ◽  
High Speed Video

This paper aims to expand the use of CO2blasting by investigating a cryogenic deburring method for machined metallic materials. In advance to the actual deburring experiments, a streaming analysis based on high-speed video records was conducted for different blasting technologies, in order to gain deeper knowledge about their underlying active principles. For the titanium alloy Ti-6Al-4V and the stainless steel X6CrNiMoTi17-12-2, deburring experiments with three different blasting techniques were conducted and evaluated. It has been shown that cryogenic deburring has the potential to represent an alternative deburring solution for metals.

scholarly journals Cutting Properties of Austenitic Stainless Steel by Using Laser Cutting Process without Assist Gas

2012 ◽  
Vol 2012 ◽  
pp. 1-8
Author(s):  
Hitoshi Ozaki ◽  
Yosuke Koike ◽  
Hiroshi Kawakami ◽  
Jippei Suzuki
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Molten Metal ◽  
Laser Power ◽  
Laser Cutting ◽  
Cutting Speed ◽  
Cutting Process ◽  
Metallic Materials ◽  
Bottom Side ◽  
Gas Nozzle

Recently, laser cutting is used in many industries. Generally, in laser cutting of metallic materials, suitable assist gas and its nozzle are needed to remove the molten metal. However, because of the gas nozzle should be set closer to the surface of a workpiece, existence of the nozzle seems to prevent laser cutting from being used flexible. Therefore, the new cutting process, Assist Gas Free laser cutting or AGF laser cutting, has been developed. In this process, the pressure at the bottom side of a workpiece is reduced by a vacuum pump, and the molten metal can be removed by the air flow caused by the pressure difference between both sides of the specimen. In this study, cutting properties of austenitic stainless steel by using AGF laser cutting with 2 kW CO2 laser were investigated. Laser power and cutting speed were varied in order to study the effect of these parameters on cutting properties. As a result, austenitic stainless steel could be cut with dross-free by AGF laser cutting. When laser power was 2.0 kW, cutting speed could be increased up to 100 mm/s, and kerf width at specimen surface was 0.28 mm.

Preliminary Study of Manufacturing Technique Using Three Dimensions Stain Steel Braid for Bone Scaffold

2012 ◽  
Vol 184-185 ◽  
pp. 1424-1427
Author(s):  
Jia Horng Lin ◽  
Ching Wen Lin ◽  
Yueh Sheng Chen ◽  
Chien Lin Huang ◽  
Wen Cheng Chen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Stress Shielding ◽  
Three Dimensions ◽  
304 Stainless Steel ◽  
Shielding Effect ◽  
Metallic Materials ◽  
Bone Scaffold ◽  
Artificial Bone ◽  
Stereo Microscope

Nowadays, as rising research on biomaterials, the artificial bone scaffold has become the most important part of the study. Moreover, metallic materials have been applied on the artificial bone scaffold; but its high rigidity causes the stress shielding effect in bones. To improve the disadvantages of metallic materials and pursue their better mechanical properties, 304 stainless steel fibers have multi-layer braided into the 3D stainless-steel braid with porous structure and better mechanical properties, using braiding machine. In multi-layer braiding process, with the constant number of take-up gear and varying number of braid gear, the 3D stainless-steel braid was manufactured. Afterwards, its braiding structure and angle were observed by stereo microscope. Also, the optimal braiding parameters can be acquired from tensile strength test.

The Honing Technical Research of the Difficult-to-Cut Materials

2009 ◽  
Vol 416 ◽  
pp. 426-431
Author(s):  
Peng Hai ◽  
Ze Fu Bao
Keyword(s):  
Stainless Steel ◽  
Titanium Alloy ◽  
High Temperature ◽  
Technological Process ◽  
Metallic Materials ◽  
Deep Hole ◽  
High Temperature Alloy ◽  
Technical Research

The problems occurring in deep hole honing are investigated for the difficult-to-cut materials such as Titanium alloy, high-temperature alloy and stainless steel，and carried out experiments and analyses to select the optimal abrasive honing stone, to improve the honing efficiency and to select rational honing process. The best honing stone types and technological process to those metallic materials have been obtained finally.

High Temperature Slag Corrosion of Metallic Materials

CORROSION ◽  
1962 ◽  
Vol 18 (3) ◽  
pp. 91t-95t ◽  
Author(s):  
W. J. GREENERT
Keyword(s):  
Stainless Steel ◽  
Metallic Materials ◽  
Accelerated Oxidation ◽  
Metal Parts ◽  
Slurry Coating ◽  
Water Washing ◽  
310 Stainless Steel ◽  
Fuel Ash ◽  
Boiler Operation ◽  
Slag Corrosion

Abstract An examination of failed fireside metal parts and the development of remedial surface treatments are described. Observations of failed service parts and fireside exposed specimens showed scaling and accelerated oxidation of surfaces. Type 309 stainless steel showed corrosion characteristics similar to Type 310. Examination of a 60 percent Cr- 40 percent Ni specimen and a Type 310 specimen showed that the former had an 80 percent greater resistance to slag corrosion than the Type 310 stainless steel. The effect on fuel-ash corrosion of simple alkaline washes, paints and metal oxide water slurries applied directly to contaminated surfaces was determined. The following fire-side treatments were assesseed for corrosion control: (1) water washing, (2) anneal plus water wash, (3) lime slurry coating plus anneal plus water washing. The latter treatment was highly effective. A ship-board treatment requiring no complicated equipment and little interference to boiler operation is proposed. 4.2.3

scholarly journals Novel pyrazole derivatives as inhibitors of stainless steel in 2.0M H2SO4 media: Electrochemical Study

2020 ◽  
Vol 10 (3) ◽  
pp. 239-252
Author(s):  
Moussa Ouakki ◽  
Hoyam Chahmout ◽  
Sarra Sibous ◽  
Mouhsine Galai ◽  
Zakaria Benzakri ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Electrochemical Impedance ◽  
Protective Action ◽  
Activation Parameters ◽  
Electrical Circuit ◽  
Effect Of Temperature ◽  
Metallic Materials ◽  
Industrial Sectors ◽  
Impedance Parameters ◽  
Equivalent Electrical Circuit Model

Metallic materials are well known and widely used in various industrial sectors. However, they can be easily corroded in various aggressive environments. The protective action of stainless steel by two organic pyrazole compounds: {1-amino-5,10-dioxo-3-(p-tolyl)-5,10-dihydro-1H-pyrazolo[1,2-b]phthalazine-2-carbonitrile} and {1-amino-3-(2-chlorophenyl)-5,10-dioxo-5,10-dihydro-1H-pyrazolo[1,2-b] phthalazine-2-carbonitrile} in H2SO4 2.0M medium was studied using the electrochemical technics (Electrochemical Impedance Spectroscopy (EIS), potentiodynamic polarization), Scanning Electron Microscopy (SEM) and Energy Dispersion X-ray spectroscopy (EDX). Polarization curves indicate that both compounds act as anodic inhibitors. A suitable equivalent electrical circuit model was used to calculate the impedance parameters. The adsorption study showed that these compounds are adsorbed to the steel surface according to the adsorption isotherm of Langmuir. Effect of temperature was also investigated and activation parameters were evaluated.

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