Theoretical analysis of the effect of the surface layer material hardening on the corrosion resistance of the surface during operation

2021 ◽  
pp. 351-355
Author(s):  
V.F. Bez’yazychny ◽  
V.V. Pleshkun ◽  
O.N. Fedonin
Keyword(s):  
Corrosion Resistance ◽  
Surface Layer ◽  
Theoretical Analysis ◽  
Quality Parameters ◽  
Processing Conditions ◽  
Material Quality ◽  
Layer Material ◽  
Technological Processing

The analysis of the influence of technological processing conditions and material quality parameters of the surface layer of the part, including material hardening indicators, on the corrosion resistance characteristics of the part material is presented. The corresponding calculated dependences are given.

Prediction and assessment of effective state of machinery surface layer at science intensive technologies use

2018 ◽  
Vol 2018 (8) ◽  
pp. 44-48
Author(s):  
В. Бутенко ◽  
V. Butenko
Keyword(s):  
Surface Layer ◽  
Quality Index ◽  
Working Capacity ◽  
Material Quality ◽  
Layer Material ◽  
Operation Characteristics

The assessment indices of surface layer effective state in machinery subjected to different ways of finishing are considered. The role of the dislocation restructurization process in the formation of operation characteristics of surface layer material quality and prediction of its working capacity is shown. A generalized quality index of multi-component functional layers formed on operation surfaces of machinery is described.

scholarly journals Design prediction of processing conditions impact upon machine performance properties

2018 ◽  
Vol 2018 (3) ◽  
pp. 14-21 ◽  
Author(s):  
Вячеслав Безъязычный ◽  
Vyacheslav Bezyazychnyy
Keyword(s):  
Cold Work ◽  
Quality Parameters ◽  
Team Work ◽  
Processing Conditions ◽  
Performance Properties ◽  
Machine Performance ◽  
Press Fit ◽  
Technological Processing ◽  
And Performance ◽  
Cutting Modes

The paper reports theoretical dependences defining a correlation of technological processing conditions (cutting modes, tool tip geometry, properties of worked and tool materials), quality parameters of a surface layer (surface roughness, degree and depth of cold work, residual stresses) and performance properties of machinery (fatigue resistance, wear-resistance, contact rigidity, press-fit connection strength) which can be used in a team-work of a designer and a technologist at simultaneous technological pre-production.

Study of effect of technological lubricant type and parameters of tool surface layer on characteristics of multitoothed mandrelling methods of holes

2020 ◽  
pp. 246-251
Author(s):  
A.V. Shchedrin ◽  
I.Yu. Ignatkin ◽  
N.Yu. Chikhacheva
Keyword(s):  
Surface Layer ◽  
Quality Parameters ◽  
Tool Surface ◽  
Geometric Quality ◽  
Technological Lubricant

The regularities of the change in the mandrelling forces and the geometric quality parameters of the obtained holes depending on the type of technological lubricant and the parameters of the tool surface layer that implements the scheme of sequential multi-tooth mandrelling are experimentally studied.

scholarly journals The Hybrid Process of Low-Pressure Carburizing and Metallization (Cr + LPC, Al + LPC) of 17CrNiMo7-6 and 10NiCrMo13-5 Steels

Coatings ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 567
Author(s):  
Paulina Kowalczyk ◽  
Konrad Dybowski ◽  
Bartłomiej Januszewicz ◽  
Radomir Atraszkiewicz ◽  
Marcin Makówka
Keyword(s):  
Corrosion Resistance ◽  
Surface Layer ◽  
Physicochemical Properties ◽  
Surface Treatment ◽  
Retained Austenite ◽  
Treatment Process ◽  
Active Surface ◽  
Low Pressure ◽  
Low Alloy Steel ◽  
Chromium Plating

This paper presents the concept of modification of physicochemical properties of steels by simultaneous diffusion saturation with carbon and chromium or aluminum. The application of a hybrid surface treatment process consisting of a combination of aluminizing and low-pressure carburizing (Al + LPC) resulted in a reduction in the amount of retained austenite in the surface layer of the steel. While the use of chromium plating and low-pressure carburizing (Cr + LPC) induced an improvement in the corrosion resistance of the carburized steels. It is of particular importance in case of vacuum processes after the application of which the active surface corrodes easily, as well as in case of carburizing of low-alloy steel with nickel, where an increased content of retained austenite in the surface layer is found after carburizing.

Development of Nano-Structured Aluminum Surfaces by LSM

2008 ◽  
Author(s):  
Taha Mattar ◽  
Ehab Abdel Rahman ◽  
Ahmed Abdel-Aziz ◽  
Haytham El-Gazzar
Keyword(s):  
Corrosion Resistance ◽  
Surface Layer ◽  
Surface Structure ◽  
Surface Melting ◽  
Laser Surface ◽  
Laser Surface Melting ◽  
Aluminum Surface ◽  
Yag Laser ◽  
Structured Surface ◽  
Aluminum Surfaces

Aluminum is one of most common metals in all advanced and modern scientific and technological applications including electrical, electronic, chemical, engineering, energy and medical fields. The performance of aluminum alloys determines to large extent the quality and economic status of the different processes. Aluminum surface structure determine its performance where nano sized grains and layer can improve aluminum properties and performance. In this work, the improvement of aluminum surface structure and formation of nano structured surface grains by laser surface melting (LSM) using Nd-YAG laser under argon atmosphere was investigated. Different power and scanning speed were applied. The physical and chemical properties of the produced surfaces were examined. SEM, EDX and XRD analyses were performed and were correlated to hardness results. Corrosion resistance of the treated surface was investigated to evaluate their performance in aggressive media and chemical and medical applications. From the obtained data it can be concluded that Nd-YAG laser surface melting of aluminum results in formation of 750 micron nano-structured surface layer. Adjustment of LSM parameters could produce 100 nm grains or less. The obtained results showed also that LSM under argon can eliminate the formation of Al2O3 surface layer which may deteriorates the performance in certain applications. Surface layer rich in AlN is formed upon LSM. It was concluded also that corrosion resistance of the treated aluminum surfaces was improved to large extent by LSM.

scholarly journals Quality assurance of ring gear in cylindrical wheels at processing with combined grinding-polishing worm disk

2019 ◽  
Vol 2018 (2) ◽  
pp. 22-28
Author(s):  
Владимир Макаров ◽  
Vladimir Makarov ◽  
Наталья Ворожцова ◽  
Natalia Vorozhtsova ◽  
Александр Горбунов ◽  
...  
Keyword(s):  
Quality Assurance ◽  
Surface Layer ◽  
Quality Parameters ◽  
Experimental Investigations ◽  
Ring Gear ◽  
Micro Hardness ◽  
Gear Grinding ◽  
Gear Honing ◽  
Surface Residual Stresses ◽  
Comparative Results

The investigation results of technological potentialities in the finish gear grinding of a ring gear of cylindrical wheels with the combined grinding-polishing worm disk with the assurance of geometrical accuracy and quality parameters of a surface layer are shown. The comparative results of experimental investigations of the structure of surface micro-hardness, its depth and surface residual stresses at cog-wheels finish processing with gear honing and gear polish are given.

scholarly journals Profile and contour grinding of compressor blade butts

2016 ◽  
Vol 1 (1) ◽  
pp. 15-19
Author(s):  
В. Полетаев ◽  
V. Poletaev ◽  
Е. Цветков ◽  
E. Tsvetkov
Keyword(s):  
Surface Layer ◽  
Coordinate System ◽  
Quality Parameters ◽  
Compressor Blade ◽  
Improve Performance ◽  
Compressor Blades ◽  
Part Surface ◽  
Required Quality ◽  
Blade Production

The existing technologies of production of compressor blade butts related with traditional machining methods, including broaching and milling. Application of these machining methods requires further superfinishing operations to ensure the required quality of compressor blades. The automated highly-productive grinding of blade butts is an effective method to improve performance and quality of blade production. The technologies of profile and contour grinding of blades of a rotor and a compressor stator provide an automated machining of the outer parts contour in the same coordinate system, implement machining based on 3-D models of theoretical blade surfaces, ensure the required quality parameters of the part surface layer without additional finishing operations.

Finishing and Hardening of a Flat Surface Ring Area of a Workpiece by Rotary Burnishing

2017 ◽  
Vol 743 ◽  
pp. 245-247
Author(s):  
Victor P. Kuznetsov ◽  
Vladimir V. Voropaev ◽  
Andrei S. Skorobogatov
Keyword(s):  
Surface Layer ◽  
Feed Rate ◽  
Steel Surface ◽  
Flat Surface ◽  
Elementary Volume ◽  
Aisi 304 ◽  
Layer Material ◽  
Hardening Process ◽  
Aisi 304 Steel ◽  
Smoothing Process

This work researches a smoothing process of original micro-profile and hardening process of AISI 304 steel surface layer material while performing rotary burnishing of the flat surface ring area. The paper establishes the interrelation between the number of indenter impacts and elementary volume of the material with a roughness and microhardness of the surface layer. The minimum roughness Ra=30 … 45 nanometers and the maximum microhardness of 425 … 475 HV0.25 is reached with the feed rate of 0.05 mm/rev and impact multiplicity of 70 … 100.

Evaluation of the Bioactivity Behavior of a 48 Wt %SiO2 Bioglass through Experiments in Simulated Body Fluid

2012 ◽  
Vol 727-728 ◽  
pp. 1238-1242 ◽  
Author(s):  
Roger Borges ◽  
Antônio Carlos da Silva ◽  
Juliana Marchi
Keyword(s):  
Corrosion Resistance ◽  
Surface Layer ◽  
Simulated Body Fluid ◽  
Body Fluid ◽  
Glass Network ◽  
In Vitro Experiments ◽  
High Corrosion Resistance ◽  
Before And After ◽  
O 19

Among bioceramics materials, bioglasses which exhibits either a bioactive or resorbable behavior has been studied for many applications, such as bone substitutive and regeneration. When in contact with body fluid, the bioglasses can induce the formation of a hydroxyapatite surface layer. In this paper, we studied the bioactivity of a bioglass containing 48 wt %SiO2, 27 wt% Na2O, 19 wt % CaO and 6 wt %P2O5. After fusion and annealing, the samples were immersed in SBF for different periods, up to 14 days. The samples were characterized through XRD, DRIFT and SEM before and after bioactivity experiments. The overall results suggest the formation of a surface layer of consisting of hydroxyapatite, which was crystallized within seven days after in vitro experiments, leading to a suitable bioactivity. Moreover, the samples showed a glass network with high cohesion due to calcium addition, leading to materials with high corrosion resistance.

Study of corrosion resistance of doped surface layer with CuSn—CrxCy composition after plasma hardening

2021 ◽  
pp. 215-220
Author(s):  
Nguyen Van Trieu ◽  
N.A. Astafeva ◽  
A.E. Balanovsky ◽  
A.N. Baranov
Keyword(s):  
Corrosion Resistance ◽  
Surface Layer ◽  
Chromium Content ◽  
High Hardness ◽  
Plasma Coating ◽  
Corrosion Current ◽  
Ph Values ◽  
Alloyed Surface ◽  
Welding Electrode ◽  
Acidity Parameter

In the process of plasma surface hardening, coatings based on a mixture of CuSn alloy and 10/20 % OK 84.78 additive with high hardness were obtained. The study of the microstructures of the coatings showed that the content of the austenite phase decreases with an increase in the content of chromium carbide in the composition. The influence of the acidity parameter on the corrosion resistance of the alloyed surface layer with the composition of the mixture of alloys CuSn and the coating of the welding electrode OK 84.78 was evaluated. Corrosion control in 3% NaCl solutions with different pH values showed that the plasma coating has high corrosion resistance at pH = 7 and decreases by 2 times at pH = 3. An increase in the chromium content leads to an increase in the corrosion potential, and the presence of cracks leads to an increase in the corrosion current density.

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