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Author: Kennedy Beaulieu Publisher: ISBN: Category : Languages : en Pages :
Book Description
There is a lack of knowledge concerning the evolution of stress-induced damage in cast iron on the microstructural scale. This study addresses this need by investigating the continuous failure of gray cast iron (GCI) and nodular cast iron (NCI) microstructures using acoustic emissions (AE). Microstructural damage evolution is characterized by grouping into three distinct ensembles (stress ranges) for GCI and four for NCI. The amplitude of the AE damage events was interpreted as being proportional to the failure mechanism, with lower amplitude events attributed to graphite failure. Microstructural and failure analysis revealed the following failure mechanisms: graphite fracture and debonding and transgraular fracture of the iron matrix for GCI and graphite fracture and debonding and ductile fracture of the iron matrix for NCI. The AE results bring light to the controversy in the literature on NCI failure by identifying ductile fracture of the iron matrix as the dominant failure mechanism.
Author: Kennedy Beaulieu Publisher: ISBN: Category : Languages : en Pages :
Book Description
There is a lack of knowledge concerning the evolution of stress-induced damage in cast iron on the microstructural scale. This study addresses this need by investigating the continuous failure of gray cast iron (GCI) and nodular cast iron (NCI) microstructures using acoustic emissions (AE). Microstructural damage evolution is characterized by grouping into three distinct ensembles (stress ranges) for GCI and four for NCI. The amplitude of the AE damage events was interpreted as being proportional to the failure mechanism, with lower amplitude events attributed to graphite failure. Microstructural and failure analysis revealed the following failure mechanisms: graphite fracture and debonding and transgraular fracture of the iron matrix for GCI and graphite fracture and debonding and ductile fracture of the iron matrix for NCI. The AE results bring light to the controversy in the literature on NCI failure by identifying ductile fracture of the iron matrix as the dominant failure mechanism.
Author: Attila Diószegi Publisher: Trans Tech Publications Ltd ISBN: 3035730555 Category : Technology & Engineering Languages : en Pages : 546
Book Description
11th International Symposium on the Science and Processing of Cast Iron Selected, peer reviewed papers from the 11th International Symposium on the Science and Processing of Cast Iron (SPCI-XI), September 4-7, 2017, Jönköping, Sweden
Author: Adel Nofal Publisher: Trans Tech Publications Ltd ISBN: 303813483X Category : Technology & Engineering Languages : en Pages : 524
Book Description
Volume is indexed by Thomson Reuters CPCI-S (WoS). Cast iron, one of the oldest alloys known to the human race is still finding new applications in spite of fierce competition from lighter alloys as well as from the most recently discovered new materials. From its earliest beginnings in around 500BC, cast iron underwent little change until the revolutionary development of spheroidal-graphite (ductile) iron in 1949. This discovery was the spark that ignited a series of unexpected transmogrifications of that ancient alloy.After three centuries cast iron is still, surprisingly, widening its scope of application; thanks to the dedicated research work that has been carried out over the past few decades.
Author: Mattias Lundberg Publisher: Linköping University Electronic Press ISBN: 9176853586 Category : Languages : en Pages : 59
Book Description
The complex geometry of cylinder heads in heavy-duty diesel engines makes grey iron or compact graphite iron a preferred material choice due to its price, castability, thermal conductivity and damping capacity. Today’s strict emission laws have increased the demands on engine performance and engine efficiency. This means that material properties such as fatigue resistance need to be improved. Shot peening is often used to improve the fatigue resistance of components and the benefits of shot peening are associated with the induced compressive surface stresses and surface hardening. How different shot peening parameters can affect fatigue strength of grey and compact graphite iron has been investigated within the project underlying this thesis. To do this, X-ray diffraction (XRD) was utilized for residual stress measurements, scanning electron microscopy (SEM) for microstructural characterizations and mechanical fatigue testing for mechanical quantifications. The ultimate aim of this work has been to increase the fatigue resistance of cast iron by residual stress optimization. XRD measurements and SEM examinations revealed that the shot peening parameters shot size and peening intensity significantly influence residual stresses and surface deformation. Residual stress profiles, similar to the one general considered to improve the fatigue strength in steels, were obtained for both grey and compact graphite iron. Uniaxial push-pull fatigue testing on grey iron with these shot peening parameters reduced the fatigue strength with 15–20 %. The negative effect is likely related to surface damage associated with over peening and relatively high subsurface tensile residual stresses. With very gentle shot peening parameters, the uniaxial fatigue strength were unaltered from the base material but when subjected to bending fatigue an increase in fatigue strength were observed. An alternative way to increase the fatigue strength was to conduct a 30 min annealing heat treatment at 285 XC which increased the fatigue strength by almost 10 % in uniaxial loading. The improvement could be an effect of favourable precipitates forming during the annealing, which could hinder dislocation movement during fatigue. Measuring residual stresses using XRD and the sin2 -method demands accurate X-ray elastic constants (XEC) for meticulous stress analysis. The XEC referred to as 1~2s2 should therefore always be calibrated for the specific material used. The experiments conducted revealed that the XEC value is independent of the testing method used in this work. A small correction from the theoretical value should be applied when the material contains small amounts of residual stresses. The amount of residual stresses has a great impact on the XEC and thus on the stress analysis. Concluding that proper analysis of residual stresses in cast iron is not straight forward.
Author: Mariusz Holtzer Publisher: ISBN: 9783319145846 Category : Languages : en Pages :
Book Description
This book provides an overview of the surface effects at the interface boundary of metal/sand moulds, and their influence on the surface quality, microstructure and mechanical and anticorrosive properties of high-quality cast iron. It explores utilitarian aspects of the production of high-quality cast iron castings, including thin-walled castings of high-quality cast iron alloys, and examines problems related to the determination of moulding sands and reclaim quality, and their influence on castings. Presenting new material, this book takes into account the influence of metal quality, pouring temperature, solidification time, the quality of moulding sand with the reclaim application, as well the binders of moulding sands, on the formation of the degenerated graphite near surface layers. It also employs the latest research methods, such as a wavelength-dispersive spectrometer (WDS) analysis and thermodynamic calculations, which were carried out on the reactions occurring in the study area. Providing a valuable resource to academics and researchers interested in materials science, metal casting and metallurgy, this book is also intended for metal industry professionals.
Author: R. A. Testin Publisher: ISBN: Category : Cast-iron Languages : en Pages : 146
Book Description
Monotonic and fatigue test results are reported for three high hardness nodular irons with the same matrix structure and different mean nodule sizes. In addition, monotonic and fatigue data are reported for high carbon-silicon.
Author: Alfred Boyles Publisher: ISBN: 9781258271503 Category : Languages : en Pages : 162
Book Description
Presented To Members Of The ASM, During The Twenty-Eighth National Metal Congress And Exposition, Atlantic City, November 18-22, 1946.
Author: Kennedy Beaulieu
Author: Kennedy Beaulieu
Author: Attila Diószegi
Author: Adel Nofal
Author: Hanjun Li
Author: Mattias Lundberg
Author: Mariusz Holtzer
Author: Jean F. Bussière
Author: R. A. Testin
Author: Alfred Boyles
Author: G. Jolley