Wyniki wyszukiwania - BazTech

Ograniczanie wyników

1 Archives of Foundry Engineering

1 2009

Znaleziono wyników: 1

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: cast skeleton

Sortuj według:

Ogranicz wyniki do:

Examples of thermal derivative gradient analysis (TDGA) application

Cholewa M., Suchoń J., Kondracki M.

Archives of Foundry Engineering

2009

Vol. 9, iss. 4

23-30

The study presents the possibility of TDGA method based on multipoint measurement of temperature during crystallization of two test castings poured from different temperature. Sample castings have conical shape. Temperature measurement is carried out in six cone cross-sections between the heat axis and the surface of the mould cavity. The multichannel recording device allows describing the thermal derivative after time and direction. Presented examples of the assessment of kinetics of crystallization for alloys: AlSi11, CuSn8 and GJL 200 cast iron. Based on quantitative analysis of the microstructure (DAS, fig. 1 and tab.1) examples of relations were prepared, describing the mechanical and structural properties in function of crystallization kinetics parameters - DAS = f(vchł) DAS = f(\delta(dT/dt)/dt) HV = f(Gy) Rm = f(\delta(dT/dt)/dt) as shown in fig. 2 and 4. The evaluation of crystallization process was also conducted for AlSi11 skeleton castings. Pointed out was the universality of the method with respect to the mathematical interpretation of the results and its limitations due to data registration extracted from multiple thermocouples. Based on the conducted studies, the method can be applied in the industry as well as in the experimental practice.