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Thermal Analysis of the Formation and Dissolution of Cr‐Rich Carbides in Al‐Alloyed Stainless Steels
Author(s) -
Rahimi Reza,
Volkova Olena,
Biermann Horst,
Mola Javad
Publication year - 2019
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201800658
Subject(s) - dissolution , endothermic process , materials science , carbide , differential scanning calorimetry , alloy , metallurgy , austenite , microstructure , precipitation , exothermic reaction , scanning electron microscope , analytical chemistry (journal) , chemical engineering , adsorption , composite material , thermodynamics , chemistry , physics , engineering , chromatography , meteorology
The formation and dissolution of the Cr‐rich M 7 C 3 and M 23 C 6 carbides in an Al‐alloyed Fe–17Cr–9Ni–6Mn–4Al–0.42C (mass%) austenitic stainless steel are investigated by differential scanning calorimetry (DSC) measurements and correlative scanning electron microscopy (SEM)‐based examinations. The formation of M 23 C 6 during DSC heating at a rate of 50 K min −1 results in the occurrence of a weak exothermic peak. This peak is followed by two endothermic peaks appearing at higher temperatures in the solid state. The peaks in the approximate temperature ranges 1140–1230 °C and 1290–1315 °C are attributed to the dissolution of M 23 C 6 and M 7 C 3 carbides, respectively. DSC measurements are also conducted for compositional modifications of the reference alloy. The course of precipitation and dissolution reactions remains unchanged by the removal of Al from the chemical composition. Furthermore, an alloy containing lower Cr and C concentrations compared to the reference alloy do not exhibit the endothermic peak due to the dissolution of M 7 C 3 carbides, indicating its absence in the microstructure.