Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
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.
Hot Tearing and Constitutive Behaviour of Semi-solid Aluminum Alloys
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
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.
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
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.
Mechanical Properties in the Semi-solid State and Hot Tearing of Aluminum Alloys
Coalescence and Mechanical Behaviour of Semi-solid Aluminium Alloys in Relation to Hot Tearing
Author: Piero-Daniele Grasso
Publisher:
ISBN:
Category :
Languages : en
Pages : 184
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 184
Book Description
Modeling Steel Deformation in the Semi-Solid State
Author: Marcin Hojny
Publisher: Springer
ISBN: 3319679767
Category : Technology & Engineering
Languages : en
Pages : 304
Book Description
This book offers a unique approach to integrated high-temperature process modelling, intended to serve as a design aid for new metal processing technologies. The second edition has been substantially expanded to include new content such as: a new algorithm and test results of 3D stereoscopic visualization; new programming procedures for modelling; the validation of computer simulation using experimental results; a multiscale model of grain growth; a conceptual methodology developing “high-temperature” CCT (continuous cooling transformation) diagrams, and many more examples validating the numerical simulations. The models presented are applied in comprehensive tests in order to solve problems related to the high-temperature deformation of steel. The testing methods include both physical tests using specialist laboratory instruments, and advanced mathematical modelling: the Finite Element method (FE), Smoothed Particle Hydrodynamics method (SPH) and Mo nte Carlo method (MC).This approach, which integrates the fields of physical and computer-based simulations, forms the basis for the described concept of integrated high-temperature process modelling, presented in detail in this book.
Publisher: Springer
ISBN: 3319679767
Category : Technology & Engineering
Languages : en
Pages : 304
Book Description
This book offers a unique approach to integrated high-temperature process modelling, intended to serve as a design aid for new metal processing technologies. The second edition has been substantially expanded to include new content such as: a new algorithm and test results of 3D stereoscopic visualization; new programming procedures for modelling; the validation of computer simulation using experimental results; a multiscale model of grain growth; a conceptual methodology developing “high-temperature” CCT (continuous cooling transformation) diagrams, and many more examples validating the numerical simulations. The models presented are applied in comprehensive tests in order to solve problems related to the high-temperature deformation of steel. The testing methods include both physical tests using specialist laboratory instruments, and advanced mathematical modelling: the Finite Element method (FE), Smoothed Particle Hydrodynamics method (SPH) and Mo nte Carlo method (MC).This approach, which integrates the fields of physical and computer-based simulations, forms the basis for the described concept of integrated high-temperature process modelling, presented in detail in this book.
Enhanced Material, Parts Optimization and Process Intensification
Author: Uwe Reisgen
Publisher: Springer Nature
ISBN: 3030703320
Category : Technology & Engineering
Languages : en
Pages : 288
Book Description
This book reports on topics at the interface between material processing, product and process optimization. It covers new developments and challenges in welding, brazing, cutting and coating, casting and molding, additive manufacturing, simulation and optimization techniques, as well as functional and structural materials and composites. Gathering authoritative contributions on the latest research and applications, presented at the International Joint Conference on Enhanced Material and Part Optimization and Process Intensification, EMPOrIA 2020, organized by SFB1120 Aachen, SFB814 Erlangen and CCE Darmstadt, on May 19–20, 2020, in Aachen, this book provides academics, students, and professionals with a timely snapshot of the main research trends, and extensive information on cutting-edge methods and technologies in materials, manufacturing and process engineering.
Publisher: Springer Nature
ISBN: 3030703320
Category : Technology & Engineering
Languages : en
Pages : 288
Book Description
This book reports on topics at the interface between material processing, product and process optimization. It covers new developments and challenges in welding, brazing, cutting and coating, casting and molding, additive manufacturing, simulation and optimization techniques, as well as functional and structural materials and composites. Gathering authoritative contributions on the latest research and applications, presented at the International Joint Conference on Enhanced Material and Part Optimization and Process Intensification, EMPOrIA 2020, organized by SFB1120 Aachen, SFB814 Erlangen and CCE Darmstadt, on May 19–20, 2020, in Aachen, this book provides academics, students, and professionals with a timely snapshot of the main research trends, and extensive information on cutting-edge methods and technologies in materials, manufacturing and process engineering.
Hot Deformation and Processing of Aluminum Alloys
Author: Hugh J. McQueen
Publisher: CRC Press
ISBN: 1420017683
Category : Technology & Engineering
Languages : en
Pages : 596
Book Description
A comprehensive treatise on the hot working of aluminum and its alloys, Hot Deformation and Processing of Aluminum Alloys details the possible microstructural developments that can occur with hot deformation of various alloys, as well as the kind of mechanical properties that can be anticipated. The authors take great care to explain and differenti
Publisher: CRC Press
ISBN: 1420017683
Category : Technology & Engineering
Languages : en
Pages : 596
Book Description
A comprehensive treatise on the hot working of aluminum and its alloys, Hot Deformation and Processing of Aluminum Alloys details the possible microstructural developments that can occur with hot deformation of various alloys, as well as the kind of mechanical properties that can be anticipated. The authors take great care to explain and differenti
Aluminium Cast House Technology
Author: The Minerals, Metals & Materials Society (TMS)
Publisher: John Wiley & Sons
ISBN: 1118787382
Category : Technology & Engineering
Languages : en
Pages : 386
Book Description
Aluminium Cast House Technology: Eighth Australasian Conference
Publisher: John Wiley & Sons
ISBN: 1118787382
Category : Technology & Engineering
Languages : en
Pages : 386
Book Description
Aluminium Cast House Technology: Eighth Australasian Conference
Hot Deformation of Aluminum Alloys II
Author: Thomas R. Bieler
Publisher: Minerals, Metals, & Materials Society
ISBN:
Category : Science
Languages : en
Pages : 456
Book Description
These symposium proceedings from the 1998 TMS Fall Meeting examine the relationships between mechanical behavior and microstructural evolution that must be quantified to develop predictive models for hot deformation. Issues addressed include constitutive modeling; process design and modeling; laboratory simulation of large scale hot working processes; the evolution of microstructure; texture, damage, dynamic precipitation, recovery, and recrystallization processes; creep and superplastic deformation; and the ability to predict phenomena such as corrosion and formability after hot deformation.
Publisher: Minerals, Metals, & Materials Society
ISBN:
Category : Science
Languages : en
Pages : 456
Book Description
These symposium proceedings from the 1998 TMS Fall Meeting examine the relationships between mechanical behavior and microstructural evolution that must be quantified to develop predictive models for hot deformation. Issues addressed include constitutive modeling; process design and modeling; laboratory simulation of large scale hot working processes; the evolution of microstructure; texture, damage, dynamic precipitation, recovery, and recrystallization processes; creep and superplastic deformation; and the ability to predict phenomena such as corrosion and formability after hot deformation.
Physical Metallurgy of Direct Chill Casting of Aluminum Alloys
Author: Dmitry G. Eskin
Publisher: CRC Press
ISBN: 1420062824
Category : Technology & Engineering
Languages : en
Pages : 324
Book Description
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.
Publisher: CRC Press
ISBN: 1420062824
Category : Technology & Engineering
Languages : en
Pages : 324
Book Description
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.
Constitutive Behaviour and Hot Tearing During Aluminium DC Casting
Author: Willem Maarten van Haaften
Publisher:
ISBN: 9789090157924
Category :
Languages : en
Pages : 111
Book Description
Publisher:
ISBN: 9789090157924
Category :
Languages : en
Pages : 111
Book Description