scholarly journals Comparison between Contact and Immersion Method in Ultrasonic Stress Measurement of Welded Stainless Steel Plates

2013 ◽  
Vol 41 (5) ◽  
pp. 20120267 ◽  
Author(s):  
Yashar Javadi ◽  
Mehdi Ahmadi Najafabadi ◽  
Mehdi Akhlaghi
Keyword(s):  
Stainless Steel ◽  
Stress Measurement ◽  
Steel Plates ◽  
Immersion Method ◽  
Ultrasonic Stress Measurement

Analysis of Eddy-Current Measurement System for Residual Stress Assessment in Stainless Steel Grade 304

2015 ◽  
Vol 659 ◽  
pp. 623-627 ◽  
Author(s):  
Cherdpong Jomdecha ◽  
Isaratat Phung-On
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
Eddy Current ◽  
Measurement System ◽  
System Analysis ◽  
Stress Measurement ◽  
Steel Grade ◽  
Current Measurement ◽  
Residual Stress Measurement ◽  
Stress Assessment

The objective of this paper is an analysis of statistical discreteness and measurement capability of an eddy-current measurement system for residual stress assessment in stainless steel Grade 304 (SS304). Cylindrical specimens with 50 mm in diameter and 12 mm thickness were prepared to generate residual stress by Resistance Spot Welding at which the welding currents were set at 12, 14, and 16 kA. The eddy-current measurement system was including a probe with frequency range of 0.1 to 3 MHz and an eddy current flaw detector. They were performed by contacting the probe on the specimen. The measurements were performed particularly in the vicinity of heat affected zone (HAZ). In order to determine the results of the residual stress measurement, the calibration curves between static tensile stress and eddy current impedance at various frequencies were accomplished. The Measurement System Analysis (MSA) was utilized to evaluate the changed eddy-current probe impedance from residual stress. The results showed that using eddy current technique at 1 MHz for residual stress measurement was the most efficient. It can be achieved the Gauge Repeatability & Reproducibility %GR&R at 16.61479 and Number of Distinct Categories (NDC) at 8. As applied on actual butt welded joint, it could yield the uncertainty of ± 58 MPa at 95 % (UISO).

Interconnected MnO2 nanoflakes supported by 3D nanostructured stainless steel plates for lithium ion battery anodes

2014 ◽  
Vol 121 ◽  
pp. 415-420 ◽  
Author(s):  
Xiuwan Li ◽  
Dan Li ◽  
Zhiwei Wei ◽  
Xiaonan Shang ◽  
Deyan He
Keyword(s):  
Stainless Steel ◽  
Lithium Ion Battery ◽  
Lithium Ion ◽  
Steel Plates

scholarly journals Innovative Control of Biofilms on Stainless Steel Surfaces Using Electrolyzed Water in the Dairy Industry

Foods ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 103
Author(s):  
Rodrigo Jiménez-Pichardo ◽  
Iriana Hernández-Martínez ◽  
Carlos Regalado-González ◽  
José Santos-Cruz ◽  
Yunny Meas-Vong ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Biofilm Formation ◽  
Denaturing Gradient Gel Electrophoresis ◽  
Dairy Industry ◽  
Raw Milk ◽  
Steel Plates ◽  
Heat Processing ◽  
Rrna Gene ◽  
Electrolyzed Water ◽  
Biofilm Development

Biofilms on food-contact surfaces can lead to recurrent contamination. This work aimed to study the biofilm formation process on stainless steel plates used in the dairy industry: 304 surface finish 2B and electropolished; and the effect of a cleaning and disinfection process using alkaline (AEW) and neutral (NEW) electrolyzed water. Milk fouling during heat processing can lead to type A or B deposits, which were analyzed for composition, surface energy, thickness, and roughness, while the role of raw milk microbiota on biofilm development was investigated. Bacteria, yeasts, and lactic acid bacteria were detected using EUB-338, PF2, and Str-493 probes, respectively, whereas Lis-637 probe detected Listeria sp. The genetic complexity and diversity of biofilms varied according to biofilm maturation day, as evaluated by 16S rRNA gene sequence, denaturing gradient gel electrophoresis, and fluorescence in situ hybridization microscopy. From analysis of the experimental designs, a cleaning stage of 50 mg/L NaOH of AEW at 30 °C for 10 min, followed by disinfection using 50 mg/L total available chlorine of NEW at 20 °C for 5 min is a sustainable alternative process to prevent biofilm formation. Fluorescence microscopy was used to visualize the effectiveness of this process.

scholarly journals Layer-by-layer coating of stainless steel plates mediated by surface priming treatment to improve antithrombogenic properties

2016 ◽  
Author(s):  
Irene Carmagnola ◽  
Tiziana Nardo ◽  
Francesca Boccafoschi ◽  
Valeria Chiono
Keyword(s):  
Stainless Steel ◽  
Surface Modification ◽  
Platelet Activation ◽  
Colorimetric Assay ◽  
Thrombus Formation ◽  
Human Platelets ◽  
Steel Plates ◽  
Blue Dye ◽  
Layer By Layer

The stainless steel (SS) stents have been used in clinics since 1994. However, typical drawbacks are restenosis and thrombus formation due to limited endothelialisation and hemocompatibility. Surface modification is a smart strategy to enhance antithrombogenicity by promoting endothelialisation. In this work, the layer-by-layer (LbL) technique was applied for coating SS model substrates, after surface priming by functionalisation with 3-aminopropyl triethoxysilane (APTES). A LbL coating made of 14 layers of poly(styrene sulfonate)/poly(diallyldimethylammonium chloride) and heparin as last layer was deposited. FTIR-ATR analysis and contact angle measurements showed that LbL was an effective method to prepare nanostructured coatings. XPS analysis and colorimetric assay employing 1,9-dimethylmethylene blue dye to detect -COOH groups confirmed the successful polyelectrolyte deposition on the coated samples. Preliminary in vitro cell tests, using whole blood and human platelets, were performed to evaluate how surface modification affects platelet activation. Results showed that SS and SS-APTES surfaces induced platelet activation, as indicated by platelet spreading and filopodia formation. After surface modification by LbL coating, the platelets assumed a round shape and no fibrin nets were detected. Data demonstrated that LbL coating is a promising technique to fabricate antithrombogenic surface.

scholarly journals Substrate heating method for coating metal surfaces with high-silica zeolites: ZSM-5 coatings on stainless steel plates

2007 ◽  
Vol 101 (3) ◽  
pp. 374-380 ◽  
Author(s):  
Melkon Tatlier ◽  
Mesut Demir ◽  
Begüm Tokay ◽  
Ayşe Erdem-Şenatalar ◽  
Lioubov Kiwi-Minsker
Keyword(s):  
Stainless Steel ◽  
Metal Surfaces ◽  
Steel Plates ◽  
Heating Method ◽  
Substrate Heating ◽  
High Silica ◽  
High Silica Zeolites
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