Influence of heat treatment on microstructure and properties of bainitic cast steel used for frogs in railway crossovers

• Autorzy: Parzych S. , Tasak E.
• Języki publikacji: EN

Abstrakty

EN

This work deals with influence of heat treatment on microstructure and properties of sample cast assigned as a material used for frogs in railway crossover. Materials used in railway industry for frogs (manganese cast steel and forged pearlitic steel) do not fulfil strict conditions of exploitation of railway. One of the solutions is using cast steel with bainitic or bainite-martensite microstructure, what allows to gain high resistance properties (R_m = 1400 MPa, R_p0,2 = 900 MPa, hardness to 400 HBW). The cooling rates of rail type UIC60 shows that it is possible to reach the bainitic microstructure in cast of frog. The microstructure of lower banite should have an advantageous influence on cracking resistance. In order to set the parameters of heat treatment, the critical temperatures were determined by dilatometric methods determined. This heat treatment consisted of normalizing that prepared it to the farther process of resistance welding. Moreover, the CCT diagram of proposed bainitic cast steel was prepared. The exams were done that can be used to evaluate the influence of heat treatment on microstructure and properties of the sample cast.

Słowa kluczowe

EN

heat treatment; metallography; bainitic cast steel; railway frogs; railway crossover; CCT diagram

PL

obróbka cieplna; metalografia; staliwo bainityczne; rozjazd kolejowy; wykres CTPc

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2010
• Tom: Vol. 10, iss. 1 spec.
• Strony: 113--116
• Opis fizyczny: Bibliogr. 21 poz., rys., tab.

Twórcy

autor

Parzych S.

• Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, Mickiewicza 30, 30-059 Kraków, Poland

autor

Tasak E.

• Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, Mickiewicza 30, 30-059 Kraków, Poland

Bibliografia

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