Download or read book The Effect of Rate of Solidification on Hot Tearing in Aluminum Alloys written by Jacob D. Gubbay and published by . This book was released on 1956 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Study of Hot Tearing in Cast and Wrought Aluminum Alloys written by Qinxin Wu and published by . This book was released on 2012 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: During the solidification process in casting, hot tearing may occur. It is a severe defect that normally involves the formation of a macroscopic tear, which generates cracks either on the surface or inside the casting. Over the past decades, many strategies have been developed to evaluate the hot tearing tendency. Unfortunately, most of the tests can only provide qualitative information. Therefore, a reliable and quantitative test to evaluate hot tearing in aluminum alloys is highly desirable. To address this issue, WPI and CANMET MTL (both members of the Light Metal Alliance) jointly developed a quantitative hot tearing test and established a specific methodology. Using a constrained rod mold, the hot tearing formation can be quantitatively studied by measuring the contraction force, time and temperature during solidification for a restrained casting or linear contraction, time and temperature for a relaxed casting. This study investigated cast aluminum alloys A380.1 and A390 and wrought aluminum alloys 6061 and 7075. The results show that wrought aluminum alloys have a much stronger hot tearing tendency than cast aluminum alloys based on a quantitative analysis. Also, the study involves the effects of adding strontium and oxides respectively into the cast aluminum alloy A380.1. Compared with the pure A380.1 alloy, the introduction of strontium decreases the hot tearing tendency, while the inclusion of oxide greatly increases the hot tearing. The information obtained through these tests provides a database of hot tearing phenomenon and establishes a new hot tearing index.

Download or read book Solidification of Aluminum Alloys written by Men G. Chu and published by Wiley-TMS. This book was released on 2004-03 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume addresses progress in the application of solidificationprinciples to the production of aluminum alloys. Topics includemicrostructure evolution, phase formation and solidification pathanalysis, grain refinement, micro/macro-segregation, mechanicalbehavior/properties in the mushy state, solidificationcracking/tearing, gas/shrinkage porosity formation, effect ofimpurities/trace elements, and the impact of cast structure on thesubsequent fabrication and properties of finished products. Paperson the experimental or theoretical simulation of solidificationaspects of casting processes including direct chill casting,continuous casting, shaped casting, semi-solid processing, andother advanced casting technologies are also included, as well asexamples showing the use of solidification principles to solveindustrial problems. From ahref="http://www.tms.org/Meetings/Annual-04/AnnMtg04Home.html"target="_blank"2004 TMS Annual Meeting/a to be held inCharlotte, North Carolina, March 14 - 18, 2004.

Download or read book The Effect of Solidification Rates and Thermal Gradients in an Aluminum Alloy written by Frank John Worzala and published by . This book was released on 1958 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mechanical Properties in the Semi solid State and Hot Tearing of Aluminum Alloys written by and published by . This book was released on 2004 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hot Tearing in Cast Aluminum Alloys Measures and Effects of Process Variables written by Shimin Li and published by . This book was released on 2010 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Hot tearing is a common and severe defect encountered in alloy castings and perhaps the pivotal issue defining an alloy's castability. Once it occurs, the casting has to be repaired or scraped, resulting in significant loss. Over the years many theories and models have been proposed and accordingly many tests have been developed. Unfortunately many of the tests that have been proposed are qualitative in nature; meanwhile, many of the prediction models are not satisfactory as they lack quantitative information, data and knowledge base. The need exists for a reliable and robust quantitative test to evaluate/characterize hot tearing in cast alloys. This work focused on developing an advanced test method and using it to study hot tearing in cast aluminum alloys. The objectives were to: 1) develop a reliable experimental methodology/setup to quantitatively measure and characterize hot tearing; and 2) quantify the mechanistic contributions of the process variables and investigate their effects on hot tearing tendency. The team at MPI in USA and CANMET-MTL in Canada has collaborated and developed such a testing setup. It consists mainly of a constrained rod mold and the load/displacement and temperature measuring system, which gives quantitative, simultaneous measurements of the real-time contraction force/displacement and temperature during solidification of casting. The data provide information about hot tearing formation and solidification characteristics, from which their quantitative relations are derived. Quantitative information such as tensile coherency, incipient crack refilling, crack initiation and propagation can be obtained. The method proves to be repeatable and reliable and has been used for studying the effects of various parameters (mold temperature, pouring temperature and grain refinement) on hot tearing of different cast aluminum alloys. In scientific sense this method can be used to study and reveal the nature of the hot tearing, for industry practice it provides a tool for production control. Moreover, the quantitative data and fundamental knowledge gained in this thesis can be used for validating and improving the existing hot tearing models.

Download or read book A Study of Hot tearing During Solidification of Aluminum Alloys Via the Acoustic Emission Method written by Xiaojin Li and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Physical Metallurgy of Direct Chill Casting of Aluminum Alloys written by Dmitry G. Eskin and published by CRC Press. This book was released on 2008-04-17 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pulling together information previously scattered throughout numerous research articles into one detailed resource, this book connects the fundamentals of structure formation during solidification with the practically observed structure and defect patterns in billets and ingots. The author examines the formation of a structure, properties, and defects in the as-cast material in tight correlation to the physical phenomena involved in the solidification and the process parameters. Compiling recent results and data, the book discusses the fundamentals of solidification together with metallurgical and technological aspects of DC casting. It gives new insight and perspective into DC casting research.

Download or read book The effect of strain rate on solidification crack suseptibility of three aluminum alloys written by Liu Renpei and published by . This book was released on 1994 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effect of Rate of Deformation on Intergranular Failure of Aluminum Near the Melting Temperature written by James Richard Cady and published by . This book was released on 1955 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book THE EFFECT OF SOLIDIFICATION RATE AND SOLUTIONIZING QUENCH RATE ON THE MECHANICAL PROPERTIES AND HARDENING RESPONSE OF ALUMINUM ALLOYS written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract : A comparative study of five aluminum alloys was performed to characterize the effect of solidification rate and quench rate on casting microstructure and properties. The alloys were cast in the geometry for Jominy End Quench (JEQ) testing, so as to take advantage of the JEQ test's ability to give data on multiple quench rates in a single sample and illustrate the quench sensitivity of an alloy. While the Jominy End Quench test has been used in aluminum alloys, the effects of solidification rates have not been assessed in depth. The work done by other studies has either focused on a single alloy across multiple solidification rates, or on multiple alloys using a single solidification rate. To this end, three molds were created: a sand mold, a semi-permanent mold and a permanent mold, with the intent of casting JEQ bars out of multiple aluminum alloys for direct comparison. The tensile strength, hardness, porosity, and electrical conductivity were assessed, in an attempt to compare the quench sensitivities of the samples. This study will provide a starting point for more in-depth analyses of the alloys, i.e. the kinetics of precipitation strengthening over a range of length scales (cooling rates).

Download or read book The Treatment of Liquid Aluminum silicon Alloys written by John E. Gruzleski and published by . This book was released on 1990 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hot Cracking Phenomena in Welds III written by John Lippold and published by Springer Science & Business Media. This book was released on 2011-05-03 with total page 439 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the third in a series of compendiums devoted to the subject of weld hot cracking. It contains 22 papers presented at the 3rd International Hot Cracking Workshop in Columbus, Ohio USA in March 2010. In the context of this workshop, the term “hot cracking” refers to elevated temperature cracking associated with either the weld metal or heat-affected zone. These hot cracking phenomena include weld solidification cracking, HAZ and weld metal liquation cracking, and ductility-dip cracking. The book is divided into three major sections based on material type; specifically aluminum alloys, steels, and nickel-base alloys. Each of these sections begins with a keynote paper from prominent researchers in the field: Dr. Sindo Kou from the University of Wisconsin, Dr. Thomas Böllinghaus from BAM and the University of Magdeburg, and Dr. John DuPont from Lehigh University. The papers contained within include the latest insight into the mechanisms associated with hot cracking in these materials and methods to prevent cracking through material selection, process modification, or other means. The three Hot Cracking Phenomena in Welds compendiums combined contain a total of 64 papers and represent the best collection of papers on the topic of hot cracking ever assembled.

Download or read book Casting Aluminum Alloys written by Michael V Glazoff and published by Elsevier. This book was released on 2010-07-07 with total page 545 pages. Available in PDF, EPUB and Kindle. Book excerpt: Casting Aluminum Alloys summarizes research conducted at Moscow Institute of Steel and Alloy during many decades in part together with Alcoa Inc. The research covered areas of the structure, properties, thermal resistance, corrosion and fatigue of aluminum alloys in industrial manufacturing. - Emphasis on interconnection among phase equilibria, thermodynamics and microstructure of alloys - Systematic overview of all phase diagrams with Al that are important for the development of casting aluminium alloys - Diagrams ("processing windows") of important technological properties such as castability, molten metal fluidity, tendency to hot pre-solidification cracking, porosity - Mathematical models for alloy mechanical properties facilitating the down-selection of best prospect candidates for new alloy development - New principles of design of eutectic casting aluminium alloys - Examples of successful novel casting alloy development, including alloys for high-strength applications, alloys with transition metals, and novel alloys utilizing aluminium scrap

Download or read book Hot Tearing and Constitutive Behaviour of Semi solid Aluminum Alloys written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The occurrence of hot tearing during solidification is one of the major factors influencing both the quality and productivity of aluminum castings. In order to reduce the formation of hot tears, quantitative information regarding both hot tearing formation and semi-solid deformation is essential. In this study, the mechanisms of hot tearing and semi-solid deformation have been investigated via two novel techniques: x-ray micro-tomography on material deformed in the semi-solid region, and development of a three phase microstructural model based on a geometry derived from a Voronoi diagram with rounded corners and porosity. Numerical techniques were utilized to quantify both the size evolution and orientation of internal damage relative to void growth. In order to conduct the above research, a new semi-solid tensile deformation methodology was devised which uses a two thermocouple control technique to enable accurate measurement of semi-solid tensile strength and ductility. The experimental work was conducted on the aluminum - magnesium alloy AA5182 in the as-cast and hot isostatic pressing (HIP) states. The x-ray micro-tomography technique was used to observe that semi-solid deformation is accommodated by internal damage via growth of as-cast porosity and the nucleation of new damage-based voids. As the volume fraction of damage increases, the growth of voids occurs in an orientation perpendicular to the loading direction, both through expansion within the grain boundary liquid and via coalescence between voids. The damage then localizes, causing failure. The finite element semi-solid microstructural model was used to explore the effects of fraction solid, fraction porosity, and grain size on semi-solid constitutive behaviour. The simulations revealed that increased grain size and fraction porosity lead to a reduction in flow stress for a given fraction solid. Furthermore, local strain accumulation was linked to hot tearing, since strain localizes in the liquid very.

Download or read book Solidification and Casting written by G. J. Davies and published by . This book was released on 1973 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Study of the Effects of Iron and Silicon on the Solidification Behavior of 7075 Aluminum written by William J. Whealon and published by . This book was released on 1993 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: