Heat transfer simulation of steel casting parts’ air quenching process: Model improvement
Laitinen, Heidi (2023)
2023
Konetekniikan DI-ohjelma - Master's Programme in Mechanical Engineering
Tekniikan ja luonnontieteiden tiedekunta - Faculty of Engineering and Natural Sciences
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Hyväksymispäivämäärä
2023-09-15
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tuni-202309017916
https://urn.fi/URN:NBN:fi:tuni-202309017916
Tiivistelmä
Correct cooling rate in the quenching of steel casting parts is essential to achieve desired material properties. In this thesis, the heat transfer phenomena occurring during the air quenching process are examined, with the primary objective being on creating a coherent way of modeling this process with fluid dynamics software Ansys Fluent. This thesis is carried out as a customer project of Etteplan Oyj and is commissioned by Metso Oyj.
To achieve the objective of modeling the process consistently, literature research is conducted considering the phase transformations, external heat transfer mechanisms (convection and radiation) that occur during the quenching process, and the theory behind solving the fluid dynamics problem. This literature research forms the theoretical framework, which is the background for the development of a simulation procedure of heat transfer problem with the effect of phase transformations included. The cooling of steel casting parts is simulated in both forced and natural convection and compared to measured cooling data.
The achieved simulation results of both forced and natural convection cooling simulation correlate well with measured cooling data. Also the phase distributions acquired from the simulations are realistic. In the natural convection simulation, the effect of carbide formation and variation in grain size is taken into account. The uncertainties of the simulation are observed and explained, and possibilities on developing the air quenching simulation procedure further with regards to emissivity, fan modeling and calculation of the martensitic transformation constant are brought up.
To achieve the objective of modeling the process consistently, literature research is conducted considering the phase transformations, external heat transfer mechanisms (convection and radiation) that occur during the quenching process, and the theory behind solving the fluid dynamics problem. This literature research forms the theoretical framework, which is the background for the development of a simulation procedure of heat transfer problem with the effect of phase transformations included. The cooling of steel casting parts is simulated in both forced and natural convection and compared to measured cooling data.
The achieved simulation results of both forced and natural convection cooling simulation correlate well with measured cooling data. Also the phase distributions acquired from the simulations are realistic. In the natural convection simulation, the effect of carbide formation and variation in grain size is taken into account. The uncertainties of the simulation are observed and explained, and possibilities on developing the air quenching simulation procedure further with regards to emissivity, fan modeling and calculation of the martensitic transformation constant are brought up.