Download or read book Wear Resistant Coatings for Titanium Alloys Fretting Fatigue of Uncoated Ti 6Al 4V written by R. K. Betts and published by . This book was released on 1971 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of the work was to define and establish conditions of fretting wear on uncoated, shot-peened Ti-6Al-4V under which conditions fatigue effects may be expected in aircraft gas turbine engine compressor applications. The study was divided into two tasks, each concerning a specific wear phenomenon and resulting fatigue effects. Task 1 involved classic fretting fatigue between bolted surfaces relating to aircraft compressor disc assemblies. Task 2 involved studies of wear simulating that between surfaces of dovetails, in which contact pressure and displacement are related to dynamic loads.
Download or read book Wear and Fretting Fatigue Resistant Coatings for Titanium Alloys written by Robert K. Betts and published by . This book was released on 1974 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studies were performed to identify treatments to alleviate the effects of wear on fatigue properties of Ti-6Al-4V, Ti-5Al-4Mo-4Cr-2Sn-2Zr (Ti-17) and Ti-8Al-1Mo-1V. The mechanisms of wear studied were fretting fatigue and sliding wear fatigue. Fretting fatigue tests were performed using high cycle fatigue specimens with shoes bolted across the gauge sections at 25,000 psi contact pressure. The shoes induced fretting as the result of alternating bending strain motion along the edges of the contact interface. Sliding wear fatigue tests were performed by a two-step method including first the cyclic rubbing of fatigue specimens by wear shoes for 10,000 strokes of 5 mils length under 50,000 psi contact pressure. Subsequently, the specimens were tested in low cycle or high cycle fatigue to determine the effect of wear on the endurance limit. In fretting tests of Ti-6Al-4V at room temperature, and of Ti-6Al-4V and Ti-17 at 650F, a Cu shim insert between the specimen/shoe interface inhibited fretting fatigue. In sliding wear tests of all three Ti alloys at room temperature, a plasma sprayed coating of Al-bronze containing 10% carburundum polyimide prevented loss of fatigue strength. The Al-bronze/carburundum polyimide not only protected fatigue specimens to which it was applied, but also it did not cause damage to uncoated fatigue specimens against which it was rubbed. Other coatings and surface treaments evaluated did not afford complete wear protection.
Download or read book Selected fretting wear resistant coatings for titanium 6 percent aluminum 4 percent vanadium alloy written by Robert C. Bill and published by . This book was released on 1976 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fretting Resistant Coatings for Titanium Alloys written by Donulus J. Padberg and published by . This book was released on 1971 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report describes a program undertaken to establish the effect of airframe design parameters upon the severity of fretting in titanium structures and to determine the ability of selected coatings to prevent fretting induced fatigue failures. A test specimen was designed to simulate a structural joint and a series of fatigue tests was performed to determine the conditions most conducive to fretting initiated failure. It was found that at low stress levels and using tapered interference fit fasteners, the number of fatigue cycles accumulated to the point that fractures originated from fretting damage. A survey was made of titanium coatings technology and testing and three coatings were selected. On the basis of their properties and minimal degradation of Ti-6Al-6V-2Sn fatigue resistance, a chemical conversion coating and a commercial anodize coating were chosen along with a dry film lubricant. Fatigue tests were made of Ti-6Al-6V-2Sn specimens protected by the coatings from Task II. The coatings essentially eliminated the fretting induced fatigue failures of Task I. Final coating performance verification tests on Ti-6Al-4V and Ti-6Al-2Sn-4Zr-6Mo specimens demonstrated the same improvement using dry film lubricant applied to a shot peened surface. (Author).
Download or read book Titanium and Titanium Alloys written by and published by . This book was released on 1974 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook of Modern Coating Technologies written by Mahmood Aliofkhazraei and published by Elsevier. This book was released on 2021-03-06 with total page 555 pages. Available in PDF, EPUB and Kindle. Book excerpt: Handbook of Modern Coating Technologies: Fabrication Methods and Functional Properties reviews different fabrication methods and functional properties of modern coating technologies. The topics in this volume consist of nanocoatings by sol–gel processes for functionalization of polymer surfaces and textiles and mechanical fabrication methods of nanostructured surfaces such surface mechanical attrition treatment, polymer nanofabrications and its plasma processing, chemical vapor deposition of oxide materials at atmospheric pressure, conventional chemical vapor deposition process at atmospheric pressure, feasibility of atmospheric pressure, chemical vapor deposition process, Langmuir–Blodgett technique, flame pyrolysis, confined-plume chemical deposition, electrophoretic deposition, in vitro and in vivo particle coating for oral targeting and drug delivery, novel coatings to improve the performance of multilayer biopolymeric films for food packaging, corrosion protection by nanostructured coatings, tribological behavior of electroless coatings, effect of peening-based processes on tribological and mechanical behavior of bioimplant materials, improved efficiency of ceramic cutting tools in machining hardened steel with nanostructured multilayered coatings, incorporation of elastomeric secondary phase into epoxy matrix influences mechanical properties of epoxy coatings, enhancement of biocompatibility by coatings, porous hydroxyapatite–based coatings, and bionic colloidal crystal coatings.
Download or read book NASA Technical Note written by and published by . This book was released on 1976 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1992 with total page 1572 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fretting Fatigue written by Robert Barry Waterhouse and published by Elsevier Science & Technology. This book was released on 1981 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wear Resistant Coatings for Titanium Alloys written by B. A. Manty and published by . This book was released on 1977 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: Techniques for applying chromium-molybdenum alloys to titanium alloy substrates were developed and the resulting systems evaluated as protective coating. Deposition techniques including electroplating and sputtering were considered and diffusion properties studied. A coating alloy containing 1% molybdenum was shown to greatly improve the wear resistance. Erosion, oxidation and stress corrosion properties were also improved. The coatings system had no apparent effect on fatigue properties of Ti 8Al-1V-1Mo at either room temperature or 315 C. (Author).
Download or read book Titanium Technology written by F. H. Froes and published by . This book was released on 1985 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Erosion Resistant Coating for Titanium written by William J McAnally (III.) and published by . This book was released on 1973 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt: NITRIDES, BORIDES, ADHESION, STRESS CORROSION, PLATING, NICKEL, COMPRESSOR BLADES, IMPELLERS*ABRASION RESISTANT COATINGS, TITANIUM NITRIDES, TITANIUM CARBIDES, TITANIUM ALLOY 6AL 4V, TITANIUM BORIDEThe objective of the program was to develop the application of TIKOTE-C on the Ti-6Al-4V alloy with minimum degradation of mechanical properties. The approach for accomplishing this objective was to protect the titanium microstructure with an intermediate nickel barrier, as well as to provide a ductile layer which might inhibit crack propagation. In addition, embrittling effects due to gas absorption during the coating process were minimized by using a lower process temperature. The program was divided into two major categories: (1) TIKOTE-C coating application development, and (2) extensive mechanical tests. A brief evaluation of the fatigue characteristics and erosion resistance of nickel-plated and titanium diboride-coated titanium test specimens was made.
Download or read book Engineering Materials and Application written by Tan Jin and published by Trans Tech Publications Ltd. This book was released on 2013-01-25 with total page 1054 pages. Available in PDF, EPUB and Kindle. Book excerpt: Selected, peer reviewed papers from the 2012 International Conference on Engineering Materials (ICEM 2012), December 30-31, 2012, Singapore, Singapore
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2676 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Surface Treatment of Ti 6Al 4V for Impact Fatigue and Wear Resistance written by G. Koves and published by . This book was released on 1968 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tests have shown that the Ti-6Al-4V alloy performs best under impact-fatigue loading conditions. This type of test best simulated actual loading conditions in many components in electro-mechanical devices. While the desired impact-fatigue performance is obtained with Ti-6Al-4V, the tendency of the alloy to gall and seize in wear indicated the desirability of some means of surface treatment for improved wear resistance. The combination of improved or unimpaired fatigue performance, along with improved wear, are not necessarily complementary results of surface treatment. Three basic types of surface treatments were investigated: (1) nonmetallic compound or gaseous diffusion coatings, (2) intermetallic-compound coatings, and (3) diffused metal coatings. After eliminating a number of surface treatments on the basis of hardness testing and microstructural examination, the following were selected for impact-fatigue and wear testing: (1) nitriding, (2) heat treatable titanium-chromium alloy layer, (3) heat treatable titanium-chromium alloy layer plus nitriding, and (4) oxygen-saturated alpha-titanium layer. The impact-fatigue testing showed that it is possible to obtain a surface treatment which results in improved fatigue life of Ti-6Al-4V. The results of all impact-fatigue testing will be presented, along with a discussion of subsequent wear testing of each surface treatment.
Download or read book Friction Surfacing of Titanium Grade 1 and Ti 6Al 4V written by Viktoria Fitseva and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The friction surfacing process is a relatively novel and promising surface modification technology, by which coatings can be deposited as a protection or surface repair method. The main feature of this process, compared with other technologies, is that the coatings are deposited in solid state phase. Therefore, the induced massive deformation alters the initial microstructure of the materials, resulting in a fully recrystallised microstructure of the coatings. Typically, the grain size of the coating is smaller than that of the raw material, which leads to improved mechanical properties. Since the process is a relatively new technology, several possible material combinations in similar or dissimilar configurations are unexplored. Titanium alloys are rather expensive. Therefore, new technologies are required to keep the production cost at an acceptable level and offer an additional cladding process that is environmental friendly. The aim of the current work was to deposit coatings from the titanium alloys by friction surfacing. Process development for Ti-6Al-4V alloy and Ti-Gr.1 as coating materials to be deposited by friction surfacing was carried out. At high temperatures titanium alloys exhibit complex deformation behaviour, particularly when passing through the alpha-beta phase transformation and in the beta phase state. Strain rate sensitivity and flow instabilities are characteristics of Ti-based materials that may hinder the deposition process. These difficulties were overcome by the selection of an adequate process control method and a systematic choice of process parameter combinations. A broad range of parameter sets for titanium depositions has been established, whereby two different acting rotational speed regimes were observed. The low rotational speed regime revealed variations in the process temperature, which influenced the material flow behaviour leading to flash generation at the coating. The microstructure in this regime consists of refined dynamically recrystallised grains. In contrast, the high rotational speed regime revealed a higher resulting temperature, which did not vary in this range. This constant temperature led to stable material flow behaviour and flash-free coatings were deposited. However, the high temperature influenced the grain size of the coatings resulting in coarse grains. Still, these differences in the grain size did not influence the fretting wear behaviour of the coatings. The investigation of fretting wear experiments exposed a similar behaviour of friction surfacing coatings and the base material. In micro tensile tests the coatings exhibited an increase in strength but a decrease in ductility, which is typical for dynamically recrystallised materials, which contain residual deformation. Therefore, it could be shown that friction surfacing can be considered as a repair method for titanium parts.
Download or read book Development of Advanced Coatings as Palliatives for Avoidance of Fretting and Galling in Titanium Alloy written by and published by . This book was released on 2001 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report has been developed under a SBIR contract for Topic AF00-167. The titanium (Ti) turbine engine components such as blades and discs are susceptible to fretting related damage and therefore is a major concern for U.S. Air Force. The purpose of the Phase I work was to develop advanced multifunctional coatings as palliatives for mitigating the fretting related damage in titanium alloy and to rationalize the fretting damage with finite element analysis. Vacuum filtered arc and magnetron sputtering techniques were used to develop various coatings. The composition and structure of the developed coatings were thoroughly characterized. Fretting wear and friction behavior of the coatings deposited on Ti alloy was evaluated in a reciprocating pin-on-flat configuration with small displacement amplitude. Most of the coatings showed considerable promise in mitigating fretting wear. Limited fretting fatigue tests were also conducted on coated specimens. So far no improvement in the fatigue life of coated specimens was found. Based on finite element analysis an expression was developed which may help in selecting suitable coatings for enhanced fatigue life.
