Comparison of mechanical properties in flake graphite and compacted graphite cast irons for piston rings

Sjögren, Torsten; Vomacka, P.; Svensson, Ingvar L

doi:10.1179/136404604225017474

Cited by 34 publications

(18 citation statements)

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“…As an example the mechanical behaviour of cast aluminium alloys is highly dependent on the secondary dendrite arm spacing (SDAS) [1][2][3], determined by the local solidification time [4] which typically varies throughout the component. In cast irons the mechanical behaviour is similarly highly controlled by graphite morphology and pearlite content [5][6][7][8]. The casting process thus results in non-homogenous mechanical behaviour throughout a component, which needs to be considered to correctly predict the mechanical response and performance of the component [9].…”

Section: Introductionmentioning

confidence: 99%

Incorporating predicted local mechanical behaviour of cast components into finite element simulations

Olofsson¹,

Svensson²

2012

Materials & Design

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A software which enables the incorporation of local variations in both elastic and plastic mechanical behaviour predicted by a casting process simulation into a Finite Element Method (FEM) simulation is presented. The software uses a piecewise linearization of the Hollomon or the Ludwigson equation to characterise plastic mechanical behaviour of the material on an element level throughout a component. The accuracy obtained in the linearization is investigated, and the performance of the software is studied using different input parameters. The applicability of the software is verified and demonstrated on a ductile iron component, and a simulation strategy for cast components denoted a closed chain of simulations for cast components is discussed.

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Section: Introductionmentioning

confidence: 99%

Incorporating predicted local mechanical behaviour of cast components into finite element simulations

Olofsson¹,

Svensson²

2012

Materials & Design

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“…Fine graphite flacks will be found due to this separation action causing change in mechanical properties of gray cast iron. Previous researches [5,9] also qualitatively describe the effects of the graphite morphology and the matrix charac-teristics on the mechanical properties, where both the small graphite flakes and the maximum primary austenite content is known to increase the strength of cast iron. The crack initiation and propagation in the cast irons are influenced by the degree of absorbed energy by the matrix for plastic deformation.…”

Section: Resultsmentioning

confidence: 99%

Influence of Semi-Solid Isothermal Heat Treatment on Microstructure of Gray Cast Iron

Fathy¹

2013

JMMCE

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Materials serve as an enabling technology contributing to solutions in problems of concern to society. In this research, the effect of semi-solid isothermal heat treatment on graphite morphologies and matrix structure for gray cast iron were studied. Microstructure observations and measurements of flaky graphite morphology are reported as a function of isothermal heating time range of 5 to 25 minutes after isothermal heating temperature at 1163˚C. The effect heating time, on the semisolid microstructures during partial re-melting was investigated. Flack graphite morphology was changed significantly by isothermal heating of gray cast iron at 1163˚C for heating time above 15 min resulting fine graphite morphology in matrix structure. Hardness increases with increasing heating time due to the amount of cementite and fine pearlite matrix for air cooled gray cast iron. The optimum heating treatment condition was achieved at the temperature of 1163˚C for the range of 15 to 20 min.

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“…(1) The heating body was launched, and the temperature of the sink was kept at 25 C ± 0.5 C by the temperature sensor and controller. (2) Under the control of computer, FLUKE294 generated a high-frequency sine wave as the driving signal of the ultrasonic emitting probe. (3) On the one hand, the DPO4054 acqured the driving signal and transmitted it to computer, which is considered as the initial reference signal.…”

Section: Ultrasonic Wave System For Fast Detecting Vermicular Graphitmentioning

confidence: 99%

System and Experiment on Fast Testing Vermicular Graphite Percent in Cast Iron Based on Ultrasonic Longitudinal Wave

et al. 2016

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Vermicular graphite percent is an important index of evaluating the vermiculation of graphite in cast iron. Quantitative metallographic method is commonly used to test the vermicular graphite percent, but it can only detect certain parts of the cast iron specimen. Therefore, an ultrasonic system was designed to detect the degree of the vermiculation in cast iron according to the relationship between the ultrasonic propagation velocity and the vermicular graphite percent, and it is composed of the sink lled with ultrasonic coupling agent, ultrasonic emitting probe, ultrasonic receiving probe, high-frequency signal generator, ultrasonic signal acquisition unit and computer. Without measuring the length of the cast iron specimen, the propagation velocity can be calculated by three different kinds of propagation time. A speci c relation between the vermicular graphite percent η and the propagation velocity ν was got by experiments. When the propagation velocity is below 5700 m s , they have a linear relationship, namely η = −v/1.53 + 5800/1.53. The comparative experiments showed that the coef cient of variation and the error were below 0.3% and 4%, respectively, which indicated the repeatability and accuracy of the system are very good.

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Comparison of mechanical properties in flake graphite and compacted graphite cast irons for piston rings

Cited by 34 publications

References 0 publications

Incorporating predicted local mechanical behaviour of cast components into finite element simulations

Incorporating predicted local mechanical behaviour of cast components into finite element simulations

Influence of Semi-Solid Isothermal Heat Treatment on Microstructure of Gray Cast Iron

System and Experiment on Fast Testing Vermicular Graphite Percent in Cast Iron Based on Ultrasonic Longitudinal Wave

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