Search results

In this way, the present work aims at predicting the thermally induced stresses (localisation and level) through numerical simulations and then, at defining the main parameters which influence their development 1.
Brazing process Brazing is a welding process which produces the coalescence of two or more like or unlike base materials by means of a filler metal alloy with a lower melting point.
“Residual stresses in metal-ceramic bonded strips”, Journal of the American Ceramic Society, v.68, no.5, pp. 241-248
“Residual stress state of brazed ceramic/metal compounds”, Journal of the American Ceramic Society, v.73, no.5, pp. 1144-1149
“Thermal residual stresses in ceramic to metal brazed joints”, Journal of the American Ceramic Society, pp. 2141-2147

The decisive factor for their implementation was the advantage in efficiency due to a reduction of irrevocable losses of alloying in the oxidative period [5].
As one of the solutions, is proposed the micro-alloying of the metal with ferrocerium, which is characterized by additional costs [7].
The aim of this work is a comprehensive analysis of the influence of technological factors on crack formation in the production of steel products grade 08X18H10T.
Stumpf, Hot workability of AISI 321 and AISI 304 austenitic stainless steels, Journal of Alloys and Compounds 595 (2014) 103-112
Mainier, Influence of stabilization heat treatments on microstructure, hardness and intergranular corrosion resistance of the AISI 321 stainless steel, Journal of materials science 43(2) (2008) 536-540

This study aims to describe the results of characterization of physical properties and design comparation of knee implant. the characterization of the material was intended to determine the morphology using SEM, crystal structure using XRD, and chemical composition using XRF.
Phase identification of Ti6Al4V alloys.
Saini, Implant biomaterials: A comprehensive review, World Journal of Clinical Cases, 3 (2015) 1
Lin et al., Surface damage mitigation of Ti6Al4V alloy via thermal oxidation for oil and gas exploitation application: characterization of the microstructure and evaluation of the surface performance, RSC Advances, 7 (2017) 13517–13535
Murr et al., Microstructure and mechanical behavior of Ti–6Al–4V produced by rapid-layer manufacturing, for biomedical applications, Journal of the Mechanical Behavior of Biomedical Materials, 2, (2009) 20–32

In addition to steel as the metal component, an aluminium alloy (EN AW – 6082) was used.
Hybrid compounds that were heated up to 350°C showed a partial separation.
The upper two test series in Fig. 6 show the bonding strength of the compounds that were bonded by an adhesive and the two lower test series show the bonding strength of the compounds that were bonded by the resin of the CFRP.
The bonding of the compounds with adhesive has a significantly higher strength level.
Thus, at the same temperatures higher internal stresses in the aluminium-CFRP compounds arise.

Although there are several magnesium alloys, AZ alloys, such as AZ31B, that are widely used in industrial applications, as they have higher plasticity with lower aluminum content [1].
Many experiments have been carried out with the aim of improving the mechanical properties of the AZ31B alloy.
Mg alloys offer a lightweight alternative to comparable alloys, such as aluminum, which provides great potential for reducing the weight of systems.
[7] Doege, Eckart, and Klaus Droder, Sheet Metal Forming of Magnesium Wrought Alloys - Formability and Process Technology, Journal of Materials Processing Technology, Elsevier, 17 July 2001
[9] Hamad, Kotib, and Young Gun Ko, Structural Features and Mechanical Properties of AZ31 Mg Alloy Warm-Deformed by Differential Speed Rolling, Journal of Alloys and Compounds, Elsevier, 10 Feb. 2018

A current trend of increasing the use of numerical simulation combined with physical experiment verification opens up new opportunities and challenges to this aim.
Fig. 7(b) is the partially enlarged curves within the aluminum alloy phase transition temperature, namely below 650℃.
It may be known from the 2014 aluminum alloy composition and the aluminum-copper alloy binary phase diagram that the microstructures at the welding seam are mainly composed of α phase and θ phase; during the cooling process, the super-saturation state α solid-solution may be firstly formed in the weld zone; then the solubility of α solid solution is gradually decreased while the temperature is lowered continuously; thus the redundant Cu may be dissolved mainly in the form of metal compound CuAl2 out of α solid solution so as to form the θ phase, which may be preferably dissolved out of the α phase at the crystal boundary locations and sequentially in the flaw sections inside the crystal grains.
References [1] G.N.Labeas, “Development of a local three-dimensional numerical simulation model for the laser forming process of aluminium components,” Journal of Materials Processing Technology, vol. 207, October. 2008, pp248-257, doi:10.1016/jmatprotec.2007.12.098
[2] G.A.Moraitis, G.N.Labeas, “Prediction of residual stress and distortions due to laser beam welding of butt joints in pressure vessels,” International Journal of Pressure Vessels and Piping, vol. 86, February-March. 2009, pp133-142, doi:10.1016/j.ijpvp.2008.11.004

Chemically, natural organic inhibitors contain S, N, O, P, and ring structures of heterocyclic compounds [16].
These compounds have their own mechanisms in protecting metals from corrosion.
Mechanism of Formation of Tannin Complexes with Fe3+ [36] Tannin compounds can form complex compounds with iron (II) and iron (III).
The two compounds will form a thin barrier layer on the metal surface as illustrated in Figure 6.
Aptuning, “Pharmaceutical Journal Of Indonesia Preliminary Studies on the Content of Phytochemical Compounds On Skin of Salak Fruit (Salaccazalacca),” Pharm.

Biomimetic processes have been widely studied in the aim of growing a bone-like apatite layer on different substrates by using simulated body fluids with an ionic concentration higher than that of SBF.
However, no peaks corresponding to a new bioactive compound were detected by this technique on the materials tested.
This indicates the presence of the compound identified by XRD.
According to the EDS analysis a compound with an atomic Ca/P ratio = 1.58-2.3 was obtained, which may correspond to octacalcium phosphate (OCP) [12].
Journal of Non- Crystalline Solids, 352, (2006) 3508–3511

The aim of this research is to develop a new cathode material, barium strontium cobalt ferrite–samarium doped ceria (BSCF-SDC) added with argentum (Ag) for low-temperature SOFCs (LT-SOFCs).
International Journal of Hydrogen Energy. 41(47) (2016) 22415-22421
International Journal of Hydrogen Energy. 40(35) (2015) 11998-12002
Journal of Power Sources, 192(2)(2009) 231–246
[18] Qing Xu, Duan Ping Huang, Feng Zhang and Han Xing Liu, Structure electrical conducting and thermal expansion properties La0.6Sr0.4Co0.8Fe0.2O3-δ – Ce0.8Sm0.2O2-δ composite cathodes, Journal of Alloys and Compound 454(s1-2): (2008) 460-465

For hardening of machine and mechanism parts surfacing with сhromium-tungsten steels and alloys is widely used.
Figure 1. - "Ideal" "a" and conventional "b" welding thermal cycles: Ar1 and Tp - initial and final temperature of austenite decomposition in specified area; tp - austenite decomposition time The aim is justification of parameterization of thermal cycle for surfacing of metallurgical equipment parts with heat-resistant steels.
To reduce the amount of hydrogen in the weld metal [1-3] one should consider clearing surfaced pieces of rust, calcifying electrode materials, application of high purity protective gases, adding compounds able to bind the hydrogen in hard-dissociating compounding such as HF into electrode materials, etc.
It has been established that the hydrogen content varies from 0,3–0,6 сm3/100g of weld metal while permissible content of hydrogen in high-alloy weld metal is 2 сm3/100 g [6].
Production of Electrodes for Manual Arc Welding Using Nanodisperse Materials // World Applied Sciences Journal . - 2014 - №. 29(6). - p. 720-723