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Segregation of phosphorus and boron in austenite in Fe–10%Mn–P–B‐alloys
Author(s) -
Paju Martti,
Grabke Hans Jürgen
Publication year - 1989
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.198900961
Subject(s) - boron , chemistry , analytical chemistry (journal) , phosphorus , quenching (fluorescence) , austenite , metallurgy , alloy , nuclear chemistry , crystallography , materials science , microstructure , physics , fluorescence , organic chemistry , chromatography , quantum mechanics
Equilibrium segregation of phosphorus at the grain boundaries of austenite has been studied in Fe–10%Mn–P–B‐alloys. The samples were equilibrated at temperatures of 750–1100°C and analysed after rapid quenching using Auger‐electron spectroscopy. The results show that boron markedly reduces segregation of phosphorus in austenite. Boron was also found to be segregated at the prior austenite grain boundaries. The intergranular boron concentration increases slightly with a rising austenitising temperature, but does not show any dependence on boron or phosphorus content of the alloy. The results can be explained by assuming segregation equilibria and mutual displacement between B and P in austenite, a value of −97 kJ/mole for the free energy of boron segregation and −47 kJ/mole for phosphorus segregation.