Investigation of Spinodal Decomposition in Isothermally Heat Treated LDX 2101 type Duplex Stainless Steel at 475 °C
Authors
-
Tibor Berecz
AffiliationDepartment of Materials Science and Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Műegyetem rkp. 3., H-1111 Budapest, Hungary
-
István Mészáros
Affiliation
Department of Materials Science and Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Műegyetem rkp. 3., H-1111 Budapest, Hungary
-
Péter Jenei
Affiliation
Department of Materials Physics, Faculty of Science, Eötvös Loránd University, Pázmány Péter sétány 1/a., H-1117 Budapest, Hungary
Abstract
Spinodal decomposition of the ferritic phase, a thermally induced phase transformation process is studied in an LDX 2101 type lean-duplex stainless steel by different examination methods. This phase transformation in duplex stainless steels has special importance because it is responsible for the so called "475 °C embrittlement". This deterioration process causes a decrease in toughness and corrosion resistance. Fe-Cr alloys, thus several stainless steels, are susceptible to the spinodal decomposition at intermediate and low temperatures (<600 °C). Therefore, it is important to study this phenomenon in novel lean-duplex stainless steels as well. Our results revealed that spinodal decomposition occurs to a lesser extent in the studied type of lean-duplex stainless steel but its effect is not negligible in applications.
Keywords:
lean duplex stainless steel, differential thermal calorimetry, X-ray diffraction, spinodal decomposition, magnetic measurements, thermoelectric powerCitation data from Crossref and Scopus
