Der Werkstoff Gußeisen

Patterson, Wilhelm; Engler, S.; Ammann, D.; Boenisch, D.; Brand, H.; Dietzel, G.; Iske, F.; Koppe, W.; Neumann, Franz; Standke, Wolfgang

doi:10.1007/978-3-642-86951-8_2

Cited by 2 publications

(3 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Further theories have been published since Pellini's original work. [2][3][4][5] In 1966 Williams and Singer reviewed six different quantitative theories, but were unable to formulate a general quantitative theory. 4 The following year Patterson, Engler and Ku ¨pfer postulated a general theory, known as Ku ¨pfer's theory.…”

Section: Introductionmentioning

confidence: 99%

Theory of hot crack formation

Fredriksson¹,

Haddad-Sabzevar²,

Hansson³

et al. 2005

Materials Science and Technology

View full text Add to dashboard Cite

The hot crack sensitivity in metals is suggested to be caused by the supersaturation of vacancies created during the solidification process. Equations have been derived to predict the nucleation and growth of cracks by the condensation of vacancies. The transition temperature from brittle to ductile fracture was found to be related to the decrease in the supersaturation of vacancies due to an annealing process. The hot crack sensitivity was observed to be related to the supersaturation of vacancies, the diffusion rate, and the structure coarseness. The effect of surface active elements such as phosphorous and sulphur in steel alloys is discussed.

show abstract

Section: Introductionmentioning

confidence: 99%

Theory of hot crack formation

Fredriksson¹,

Haddad-Sabzevar²,

Hansson³

et al. 2005

Materials Science and Technology

View full text Add to dashboard Cite

show abstract

“…The spatial and temporal gradients of heat and water concentration within the mould result in mobile zones of different mechanical properties, notably of different tensile strength (Patterson and Boenisch 1964), of the mould material. In the condensation zone facing away from the melt, increasing moisture causes a significant decrease of tensile strength.…”

Section: Introductionmentioning

confidence: 99%

“…The quality of bentonite-bonded sand in general and the tendency towards scabbing in particular can be determined by the ratio of compressive strength and wet tensile strength (Patterson and Boenisch 1964). In the industrial practice, the most common method of assessment of the mould performance during casting is wet tensile testing (BDG 1997).…”

Section: Introductionmentioning

confidence: 99%

Neutron Radiographic Study of the Effect of Heat-Driven Water Transport on the Tensile Strength of Bentonite-Bonded Moulding Sand

et al. 2017

View full text Add to dashboard Cite

Wet tensile testing is a common method to assess the stability of bentonite-bonded moulding sands. For wet tensile testing, a specimen is first heated from above in order to simulate heat-driven moisture transport induced by the casting process. Then, tensile stress is applied until rupture. In this study, neutron radiography imaging was applied to moulding sands in situ during heating and wet tensile testing in order to investigate the effects of water kinematics on the tensile strength. Neutron radiography allowed the localization of the rupture plane and the quantitative determination of the local water content with sub-mm resolution. Quantification of the temperature at the rupture plane and of the heat kinematics within the specimen was accomplished by temperature measurements both in situ and ex situ. In this way, experimental data correlating the wet tensile strength with the specific conditions of moulding sands at the rupture plane were obtained for the first time. that the weakest location within a sand profile can be pinpointed at the interface between evaporation and condensation zone (i.e. at the 100 • C isotherm), where water vaporization starts and the water bridges connecting the sand grains collapse. This weakest location has maximum strength, if the local water content at the rupture plane is between 5 and 9 wt.%. Less water leads to a strong decrease of wet tensile strength. More water requires an initial water content above 5 wt.%, which leads to a decrease of the tensile strength of the unheated sand.

show abstract

Der Werkstoff Gußeisen

Cited by 2 publications

References 48 publications

Theory of hot crack formation

Theory of hot crack formation

Neutron Radiographic Study of the Effect of Heat-Driven Water Transport on the Tensile Strength of Bentonite-Bonded Moulding Sand

Contact Info

Product

Resources

About