Viscosity Controlled Interdiffusion in Nitriding

2017 ◽  
Vol 10 ◽  
pp. 28-38
Author(s):  
Katarzyna Tkacz-Śmiech ◽  
Bogusław Bożek ◽  
Lucjan Sapa ◽  
Marek Danielewski
Keyword(s):  
Plastic Deformation ◽  
Dynamic Pressure ◽  
S Phase ◽  
Diffusion Saturation ◽  
Concentration Profiles ◽  
New Approach ◽  
Austenite Steel ◽  
Basic Equations ◽  
Model Formation ◽  
Nitride Zone

This works presents new approach to model formation of expanded austenite (S-phase) during nitriding in plasma conditions. Diffusion saturation of the substrate (iron or austenite steel) is treated as interdiffusion of nitrogen and iron that involves stresses and plastic deformation and is based on the Darken scheme. It is argued that S-phase growing at nitriding behaves as elasto-viscous Maxwell solid. During the process, in the nitride zone, the dynamic pressure appears, which is related to Darken drift and depends on metal viscosity. Basic equations are formulated and discussed. The formula for drift is derived. Exemplary results, i.e. concentration profiles, dynamic pressure and dilatation of the sample during the process, are presented. Concentration profiles confirm existence of characteristic plateau like zone in the surface adjacent zone.

A New Approach to Elastodynamic Response of Cylindrical Shell Based on Generalized Solution Structure Theorem for Wave Equation

2010 ◽  
Author(s):  
Shugen Xu ◽  
Weiqiang Wang ◽  
Yan Liu
Keyword(s):  
Wave Equation ◽  
Solution Structure ◽  
Structure Theorem ◽  
Dynamic Pressure ◽  
Structural Response ◽  
Generalized Solution ◽  
New Approach ◽  
Response Data ◽  
Elastodynamic Response ◽  
Detailed Derivation

In this paper, a generalized solution structure theorem has been provided. It can be use to solve the wave equation about the structural response of cylinder under the dynamic pressure. This new approach also can be used to solve a batch of partial differential equations with the similar form. A detailed derivation process has been given to show how the solution is obtained. Finally, a practical example is presented, and all the elastodynamic response data at any point during dynamic pressure can be acquired conveniently.

The New Approach to the Analysis of Elasto-Plastic Deformation of Solids Within the Bounds of Theory of Processes by A. A. Ilyushin

2001 ◽  
Author(s):  
Kamal Sh. Babamuratov ◽  
Rustam A. Abirov
Keyword(s):  
Plastic Deformation ◽  
Complex Loading ◽  
New Approach ◽  
Elastic Plastic ◽  
Computer Complex ◽  
Loading Method

Abstract In this report results of systematic researches of the experimental-theoretical CL-computer (complex loading) method, offered by Ilyushin for solving of problem of strength and strains of elastic-plastic bodies at an incomplete theoretical information about the equations of relation between stresses and strains and the method of appraisal of reliability of plasticity problems’ solution are given. Homogeneous and nonhomogeneous problems for element of construction in form of the rods, plates, shell are accomplished. The results of numerical and CL experiments indicate on perspectivity of considered methods for calculations and projection of responsible designs in an engineering and building.

Effect of Zr on Structure and Resistance to Intergranular Corrosion of Severely Deformed 2024 Aluminum Alloy

2019 ◽  
Vol 31 ◽  
pp. 35-42
Author(s):  
Stanislav Krymskiy ◽  
Rafis Ilyasov ◽  
Elena Avtokratova ◽  
Oleg Sitdikov ◽  
Anastasia Khazgalieva ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Aluminum Alloy ◽  
Severe Plastic Deformation ◽  
Intergranular Corrosion ◽  
Artificial Aging ◽  
Volume Fraction ◽  
S Phase ◽  
2024 Aluminum Alloy ◽  
Excess Phases ◽  
Electrochemical Potentials

Effects of severe plastic deformation by isothermal сryorolling with a strain of e~2 and subsequent natural and artificial aging on the structure and resistance to intergranular corrosion (IGC) of the preliminary quenched 2024 aluminum alloy of standard and Zr modified compositions were investigated. Increasing the temperature of aging leads to decreasing the alloy IGC resistance due to precipitation of more stable strengthening S-phase (Al2CuMg), rising difference of electrochemical potentials at grain and subgrain boundaries. Zr additions, оn the opposite, significantly increased the alloy IGC resistance in both naturally and artificially aged conditions, reducing its depth and intensity. The main structural factor, influencing the alloy corrosion behavior, is excess phases: their composition, volume fraction and distribution.

A New Approach to Elastodynamic Response of Cylindrical Shell Based on Developed Solution Structure Theorem for Wave Equation

2011 ◽  
Vol 134 (1) ◽  
Author(s):  
Shugen Xu ◽  
Weiqiang Wang ◽  
Yuliang Cui ◽  
Yan Liu
Keyword(s):  
Wave Equation ◽  
Solution Structure ◽  
Structure Theorem ◽  
Dynamic Pressure ◽  
Structural Response ◽  
High Accuracy ◽  
New Approach ◽  
Elastodynamic Response ◽  
Detailed Derivation ◽  
Derivation Process

In this paper, a developed solution structure theorem has been provided. It can be used to solve the wave equation about the structural response of cylinder under the dynamic pressure. This new approach also can be used to solve a batch of partial differential equations having the similar form. A detailed derivation process has been given to show how the solution is obtained. Finally, a practical example is presented, and the finite element result is also provided to validate the accuracy of methodology proposed in this paper. The result shows that it has a high accuracy for solving the elastodynamic response of the cylinder.

scholarly journals Effect of Plastic Deformation on the Activation Energy for Precipitation of S' Phase in Al2024 Alloy

2020 ◽  
Vol 26 (S2) ◽  
pp. 2888-2889
Author(s):  
J.C. Guía-Tello ◽  
C.G. Garay-Reyes ◽  
H. M. Medrano-Prieto ◽  
M.A. Ruiz-Esparza-Rodriguez ◽  
M.C. Maldonado-Orozco ◽  
...  
Keyword(s):  
Activation Energy ◽  
Plastic Deformation ◽  
S Phase ◽  
Al2024 Alloy

The Effect of Solids Microcharacteristics on the Macroscopic Parameters of Plastic Deformation Localization in Metals

2007 ◽  
Vol 345-346 ◽  
pp. 93-96
Author(s):  
Lev Zuev ◽  
Svetlana A. Barannikova
Keyword(s):  
Plastic Deformation ◽  
Direct Relationship ◽  
Metals And Alloys ◽  
Scale Level ◽  
Deformation Localization ◽  
Quasi Particle ◽  
New Approach ◽  
Micro Scale ◽  
Macroscopic Parameters

A new approach is proposed for description of autowave processes responsible for plastic deformation localization in metals and alloys. It is postulated that to a localized flow autowave there corresponds a quasi-particle. The characteristics of the quasi-particle have been determined. A direct relationship has been established between the processes involved in the deformation on a macro- and a micro-scale level.

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