Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2013 - zeszyt 4

Continuous cooling transformation (CCT) and continuous heating transformation (CHT) diagrams for the new bainitic steel

JERZY PACYNA

nr katalogowy: 79729

An intensive development of bainitic steels has been observed during the last decade. Interesting grades were developed, among others, for railway rails [1÷3], driving shafts for wind power plants [4, 5], pipes for deep drilling [6], including grades, in which dimensions of certain phases are in nanometers [7÷9]. Bainitic steels are technologically easy with moderate production costs (mainly costs of alloying elements). Their chemical composition should be selected in such a way as to obtain the required properties, in the case of steel grades intended for structures directly after rolling. Tempering of bainitic steels should be predicted only for machine grades of a higher carbon content. This means that after the hot plastic working (after rolling or forging) grains of the prior austenite of these steels should not undergo an excessive growth and the retained austenite, left after the bainitic or bainitic-martensitic transformation, should not decrease mechanical properties, especially crack resistances. This can be achieved by the proper mechanical stabilization of the retained austenite. It is considered that the proper stability of the retained austenite occurs when the amount of work needed for its eventual transformation is higher than a decrease of work used for the structure failure caused by this transformation. MATERIAL FOR INVESTIGATIONS Steel (of a common name S1A) of a chemical composition given in Table 1, melted in an open induction furnace, was applied for investigations. Table 1. The chemical composition (wt %) of the S1A steel, used in investigations Tabela 1. Skład chemiczny (% mas.) stali S1A C Mn Si P S Cu Cr Ni Al Mo Nb V 1 0.21 1.81 0.35 0.024 0.021 0.15 1.72 0.39 0.022 0.35 0.003 0.17 The ingot of a diameter approximately of 150 mm and mass of 50 kg was reforged into bars of dimensions: 20×35 mm. From these bars, after their soft-annealing, the dilatometric samples of sizes: 4×25 mm were ma[...]

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