Author: Yu-hua SongPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Effect of Nodular Graphite on the Deterioration of Vibration Fracture Resistance of Ferritic Cast Iron Under an Aqueous Environment
Author: Yu-hua SongMaterials Transactions
Author: Effect of Graphite Nodules on Fracture Toughness of Nodular Cast Iron
Author: Z. LiThe Effect of Graphite Nodule Number and Volume Fraction on Crack Opening Displacement (COD) Values of Ferritic Nodular Cast Iron
Author: S. R. HoldsworthFracture Toughness of Ductile Cast Irons
Author: Athanasius Stephanos LazaridisPublisher:
ISBN:
Category :
Languages : en
Pages : 388
Book Description
The Production of Compacted Graphite Cast Iron and the Evaluation of Some of Its Properties
Author: Khershed Pessie CooperPublisher:
ISBN:
Category : Cast-iron
Languages : en
Pages : 454
Book Description
Damping Properties of Selected Steels and Cast Irons
Author: Aarne VisnapuuPublisher:
ISBN:
Category : Cast-iron
Languages : en
Pages : 24
Book Description
Residual stresses, fatigue and deformation in cast iron
Author: Mattias LundbergPublisher: 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.
Microstructure and Properties of Ductile Iron and Compacted Graphite Iron Castings
Author: Mariusz HoltzerPublisher:
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: Chong Sun Park