Acta Metallurgica Sinica (English Letters) >
Formation and Evolution of Microstructures in Fe–9%Cr Heat-Resistant Steel
Received date: 2014-04-10
Revised date: 2014-05-12
Online published: 2014-07-18
Microstructures of casting samples of Fe–9%Cr steel and samples subjected to different heat treatments were investigated to determine their formation and evolution mechanism. The results show that there is no macroscopic segregation in the casting Fe–9%Cr steel. During cooling from solidification temperature to room temperature, δ-ferrite → austenite transformation is obviously influenced by cooling rate, while subsequent transformation of austenite does not obviously depend on the cooling rate. In the casting samples, a great number of precipitates distribute inside martensitic laths while there are almost no precipitates inside δ-ferrite. When the casting samples were reheated to and isothermally held at 800 °C, the original precipitates and the lath boundaries disappeared gradually. Meanwhile, new precipitates nucleate and grow at the prior lath boundaries.
Key words： Heat-resistant steel; Microstructure; Precipitates; δ-Ferrite; Casting
Boling Zhu , Shanwu Yang , Guangshan Yang , Guoliang Liu . Formation and Evolution of Microstructures in Fe–9%Cr Heat-Resistant Steel[J]. Acta Metallurgica Sinica (English Letters), 2014 , 27(3) : 534 -538 . DOI: 10.1007/s40195-014-0080-0
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