Influence of the composition of α-titanium alloys on thermal conductivity

2021 ◽  
pp. 79-86
Author(s):  
I. A. Schastlivaya ◽  
V. P. Leonov ◽  
I. V. Tretyakov ◽  
A. Yu. Askinazi
Keyword(s):  
Thermal Conductivity ◽  
Titanium Alloys ◽  
Nuclear Power ◽  
Power Plants ◽  
Operating Temperature ◽  
Unique Combination ◽  
Specific Strength ◽  
High Specific Strength ◽  
Heat Exchange Equipment ◽  
Materials Used

Among titanium alloys, modern α- and pseudo-α-alloys occupy a special place due to the unique combination of their mechanical properties, corrosion resistance, low density and high specific strength, which determines their effectiveness in various industries. Analysis of structural materials used for heat exchange equipment of nuclear power plants showed that the increase in the efficiency and compactness of tube systems made of a-titanium alloys is constrained by their thermal conductivity characteristic, which does not exceed 89 W/(m·K) at a temperature of 20°C. An exception is the VT1-0 grade alloy, the scope of which is limited to a maximum operating temperature of no more than 250°C. The paper considers the results of studies of a new titanium alloy of the Ti-Zr-Al-O composition with increased thermal conductivity for pipe systems of power equipment. 

Research Progress of the Surface Oxidation of Titanium and its Alloys

2013 ◽  
Vol 748 ◽  
pp. 188-191
Author(s):  
Hui Jun Yu
Keyword(s):  
Titanium Alloys ◽  
Biomedical Applications ◽  
Influence Factors ◽  
Surface Oxidation ◽  
Research Progress ◽  
Corrosion Resistant ◽  
Specific Strength ◽  
Existing Problems ◽  
High Specific Strength ◽  
Micro Arc Oxidation

Titanium and titanium alloys possess some attractive properties, such as excellent corrosion and erosion resistance, low densities, high specific strength and modulus, enabling them extensively used in aeronautical, marine, chemical and biomedical applications and so on. Nevertheless, Recent years, the corrosion resistance of titanium and titanium alloys is required to elevate in some fields, proper surface modification such as surface oxidation can solve the problems effectively. In this paper, the recent investigations of thermal oxidation and micro-arc oxidation to improve the corrosion resistant of titanium and its alloys are reviewed. The structures, properties and their influence factors of the coatings are analysed systematically. And the existing problems and the future prospect of the further researches is mentioned.

An Investigation of the Effect of Nanoparticles on the Effectiveness of a Heat Exchanger

2007 ◽  
Author(s):  
V. Upender Rao ◽  
V. Sajith ◽  
T. Hanas ◽  
C. B. Sobhan
Keyword(s):  
Thermal Conductivity ◽  
Heat Exchanger ◽  
Operating Temperature ◽  
Particle Surface ◽  
Weight Fraction ◽  
Copper Oxide Nanoparticles ◽  
Suspended Solid ◽  
Solid Particles ◽  
Particle Surface Area ◽  
Materials Used

Convective heat transfer can be improved by enhancing the thermal conductivity of the fluid. It has been established that fluids containing suspended solid particles of metallic origin in nanoscale dimensions, display enhanced thermal conductivity. Nanoparticle suspensions have superior qualities than suspensions of larger sized particles, such as more particle surface area, less possibilities of agglomeration and clogging and better stability. An experimental investigation on the effect of the inclusion of nanoparticles into the cooling fluid on the effectiveness of a heat exchanger is presented in this paper. An experimental double pipe heat exchanger with the hot fluid flowing through the inner tube was used in the study. Aluminum oxide and copper oxide nanoparticles with a size range of 20 to 30 nm suspended in water using ultrasonic agitation was used as the hot fluid, and water was used as the cold fluid passing through the annulus. The concentration of the suspended nanoparticles was varied to investigate its effect on the performance of the exchanger. The operating temperature is also used as a parameter in the study. Typically, an enhancement of 4.5 to 7 percent was observed in the effectiveness of the heat exchanger for 0.26% weight fraction of the nanoparticles in suspension, in an operating temperature range of 50–70°C. The effectiveness of the heat exchanger was found to increase with the concentration of nanoparticles for both materials used.

An Experimental Investigation Into the High Speed Turning of Ti-6Al-4V Titanium Alloy

2010 ◽  
Author(s):  
Anil K. Srivastava ◽  
Jon Iverson
Keyword(s):  
Titanium Alloy ◽  
Titanium Alloys ◽  
High Speed ◽  
Elevated Temperatures ◽  
Chemical Reactivity ◽  
Specific Strength ◽  
Aerospace Applications ◽  
Layered Coatings ◽  
High Specific Strength ◽  
Cutting Speeds

Titanium and its alloys have seen increased utilization in military and aerospace applications due to combination of high specific strength, toughness, corrosion resistance, elevated-temperature performance and compatibility with polymer composite materials. Titanium alloys are difficult to machine due to their inherent low thermal conductivity and higher chemical reactivity with other materials at elevated temperatures. In general, temperature related machining difficulties are encountered at production speeds in the range of 60 m/min and high-speed machining of these alloys has created considerable interest to researchers, tool manufacturers and end users. This paper provides recent results obtained during turning operation with the aim of improving machinability of titanium alloys. Several tests have been conducted using (i) micro-edge prep geometry of the inserts, (ii) ultra-hard PVD coated, and (iii) nano-layered coated inserts and the effects of speeds and feeds during turning of Ti-6Al-4V titanium alloy are discussed. The initial tests have been conducted under orthogonal (2-D) cutting conditions with no coolant application. Based on these results, several oblique cutting (3-D) tests have been designed and conducted to study the effect of various types of ultra-hard and nano-layered coatings at higher cutting speeds under flooded coolant conditions. The effects of speed and feed on cutting force and tool wear are presented in this paper.

scholarly journals Titanium in Shipbuilding and Other Technical Applications

2020 ◽  
Vol 321 ◽  
pp. 02001
Author(s):  
A.S. Oryshchenko ◽  
V.P. Leonov ◽  
V.I. Mikhailov ◽  
P.A. Kuznetsov ◽  
A.V. Alexandrov
Keyword(s):  
Titanium Alloys ◽  
Nuclear Power ◽  
Power Plants ◽  
Oil And Gas ◽  
Aerospace Industry ◽  
Industrial Sector ◽  
New Production ◽  
Chemical Pulp ◽  
Industrial Sectors ◽  
Major Development

Aerospace industry is currently the major consumer of titanium in Russia. Shipbuilding is its second largest consumer. Oil and gas, chemical, pulp-and-paper and other industries use less titanium. In the Russian industrial sector titanium is geting more applicable. Since the 13th World Ti-2015 Conference the titanium application trends have persisted [1]. Among the major development trends of titanium alloys one should note the development of titanium alloys for deep-water marine facilities, case designs of small-size nuclear power plants, the development of additive technologies, the technologies of isostatic pressing, the development of titanium products by new production facilities, etc. Titanium is still considered an advanced structural material used for scientific and technical progress in different industrial sectors.

scholarly journals Optimization of the technological solutions for recharge and boron control system at the NPP for the project AES-2006

2018 ◽  
Vol 245 ◽  
pp. 07017 ◽  
Author(s):  
Anastasia Ulasen ◽  
Aleksandr Kalyutik ◽  
Anatolii Blagoveshchenskii
Keyword(s):  
Control System ◽  
Heat Exchangers ◽  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Primary Circuit ◽  
Capital Costs ◽  
Main Pipelines ◽  
Heat Exchange Equipment ◽  
Under Construction

The article considers the possible ways to optimize the technological solutions of the recharge and boron control system of nuclear power plants under construction within the AES-2006 project. The possibilities for optimization of technological solutions of the system of recharge and boron regulation of the AES-2006 project, which will not affect the reliability and efficiency of its main functions: purge-recharge of the primary circuit and boron regulation, were studied. As a result of the analysis of technological solutions and analytical calculations carried out during the work, it was found that in the system of recharge and boron regulation of the NPP within the project AES-2006 it is possible to perform optimization basing on reduction the metal content of the heat exchange equipment by reducing the surface area of the heat exchangers of the coolant outlet, reducing the power of pumps, as well as reducing the diameter of a number of main pipelines. Implementation of the proposed optimization of technological solutions will allow a more rational arrangement of the system and reduce capital costs for the construction of nuclear power plants as a whole, while not adversely affect the safety of the system and its functions.

Determining High-Temperature Oxidation Resistance of (TI-Al-X-N) Based Coatings for Titanium Alloys

2021 ◽  
Vol 320 ◽  
pp. 66-71
Author(s):  
Konstantins Savkovs ◽  
Margarita Urbaha ◽  
Viktors Feofanovs
Keyword(s):  
Titanium Alloys ◽  
Gas Turbine ◽  
Gas Turbine Engine ◽  
Resistance Testing ◽  
Maximum Efficiency ◽  
Temperature Oxidation ◽  
Turbine Engine ◽  
Specific Strength ◽  
High Specific Strength ◽  
Pressure Part

Basic titanium alloys are successfully used in modern aviation GTE (gas turbine engine). They are used for parts of a compressor and partly in low pressure part of turbine (intermetallic Ti-Al alloys) due to their high specific strength and at the same time low density, high corrosion resistance but can be used only up to 700 °C. The paper deals with the results of heat resistance testing at 750 °C of Ti-Al-(X)+N based thin ion-plasm multilayers coatings, with different priority of monolayers- intermetallic, conglomerate or nitride for gas turbine engine (GTE) blades from titanium alloys. All coatings showed high resistance during the test, with a maximum efficiency 42.8 of coating with a priority of conglomerate after 30 hours of testing.

Application of Metallographic Methods for Thermal Ageing Evaluation on Samples from Primary Piping of NPP

2017 ◽  
Vol 891 ◽  
pp. 60-66
Author(s):  
Jana Petzová ◽  
Martin Březina ◽  
Miloš Baľák ◽  
Mária Dománková ◽  
Ľudovít Kupča
Keyword(s):  
Material Properties ◽  
Nuclear Power ◽  
Power Plants ◽  
Operating Temperature ◽  
Thermal Ageing ◽  
Primary Circuit ◽  
Degradation Mechanisms ◽  
Reliable Operation ◽  
Term Operation

During a long-term operation of nuclear power plants (NPP), the changes of structural material properties occur. To ensure the safe and reliable operation, it is necessary to monitor and evaluate these changes mainly on components from primary circuit of NPPs. One of the dominant ageing mechanisms of NPP components besides the radiation embrittlement and the fatigue loads is the thermal ageing. The thermal ageing is the temperature, material and time dependent degradation mechanisms due to long-term exposure at the operating temperature of 570 K.This paper describes the project for thermal ageing monitoring at primary piping in NPP Bohunice Unit 3. There are summarized the results obtained from evaluation of original primary piping material.

Material Selection Methodology Used in Czech NPP

2009 ◽  
Author(s):  
Karel Matocha
Keyword(s):  
Physical Properties ◽  
Material Properties ◽  
Nuclear Power ◽  
Power Plants ◽  
Mechanical Characteristics ◽  
Material Selection ◽  
Technical Documentation ◽  
Parent Materials ◽  
Materials Used ◽  
Selection Methodology

The paper describes the structure of the Standard Technical Documentation A.M.E Section II “Material Properties for Equipments and Pipings of WWER Nuclear Power Plants”. It provides instructions for selection and qualification of parent materials used for manufacture, repair, reconstruction or replacement of selected equipments of WWER NPP and specifies requirements for mechanical characteristics and physical properties.

scholarly journals A REVIEW ON USAGE OF NANO-PARTICLES IN NUCLEAR POWER PLANTS

2017 ◽  
Vol 5 (2) ◽  
pp. 233-236
Author(s):  
Din Bandhu ◽  
Ritesh Kumar
Keyword(s):  
Power Plant ◽  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Review Paper ◽  
Nano Particles ◽  
Construction Experience ◽  
And Performance ◽  
Materials Used ◽  
Effects Of Radiation

Nuclear power plants are big in construction and possess complex facilities. These plants usually operate at very large temperatures and the materials used in their construction experience considerably higher levels of radiation. It is therefore very important to understand the effects of radiation on these materials. Radiation is responsible for defects which affects the strength and performance of the materials. In this review paper, we have suggested one idea for constructing an efficient nuclear power plant by using nano-particles. This paper also details about nano-particles in an elaborated way and a few of them can be used for constructing nuclear power plants (NPP).

Refinement of the thermal analysis of the gearbox taking into account the thermal conductivity of the joint

2021 ◽  
Author(s):  
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Thermal Analysis ◽  
Heat Transfer Coefficient ◽  
Thermal Conductivity Coefficient ◽  
Operating Temperature ◽  
Roughness Parameter ◽  
Tightening Force ◽  
Materials Used ◽  
Contact Thermal Conductivity

The existing method for calculating the operating temperature of the gearbox housing is clarified by taking into account the thermal conductivity coefficient of the contact, the value of which depends on the materials used for the housing and frame, the finish of the supporting surfaces and their area, as well as on the tightening force of the screws that pull the housing to the frame. An example of calculating the temperature of the housing of a worm gear is given. Keywords: gearbox, heat sink, heat transfer coefficient, thermal conductivity coefficient of contact, thermal conductivity coefficient of materials, roughness parameter. [email protected]

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