Zmiany mikrostruktury w połączeniach spawanych różnoimiennych materiałów stosowanych w energetyce
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Abstract
Wpracy przedstawiono zmiany mikrostruktury w połączeniach spawanych materiałów o różnej strukturze krystalicznej. Opisano materiały stosowane do budowy kotłów energetycznych. Omówiono tworzenie się struktury podczas krzepnięcia stali austenitycznych. Zwracając szczególną uwagę na wpływ składu chemicznego na fazy tworzące się bezpośrednio z cieczy oraz na zmiany w mikrostrukturze podczas chłodzenia z temperatury krzepnięcia do temperatury pokojowej. Przedstawiono ponadto wykresy umożliwiające przewidywanie tworzącej się mikrostruktury w spoinie materiałów różnoimiennych w oparciu o skład chemiczny łączonych stali i zastosowanego spoiwa.
Microstructure changes in dissimilar metal joint for power plants
Abstract
The work deals with microstructure in welded joints of materials with different crystal structures. The materials used for construction of power plant boilers were investigated. The development of microstructure during solidification of austenitic stainless steels was discussed. In particular, an emphasis was put on the influence of chemical composition on phases forming directly form the liquid state and changes in microstructure occurring during cooling from solidification temperature to room temperature. In addition, diagrams allowing for the prediction of microstructure forming in welded joint between dissimilar materials were presented. The prediction was based on the chemical composition of the welded steels and applied filler metal.
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