Microstructural evolution and precipitation behavior of the 0.1C-18Cr-1Al-1Si ferritic heat-resistant stainless steel during hot deformation

The 0.1C-18Cr-1Al-1Si ferritic heat-resistant stainless steel has attracted considerable attention to high-temperature applications due to its favorable combination of creep and oxidation resistance. In this paper, the microstructural evolution and precipitation behavior of the 0.1C-18Cr-1Al-1Si fer...

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Bibliographic Details
Published in:Materials research express 2020-03, Vol.7 (3), p.36513
Main Authors: Zhang, Yingbo, Zou, Dening, Wei, Tongyu, Li, Jiao, Tong, Libo, Zhang, Wei
Format: Article
Language:English
Subjects:
Chromium
Data compression
Deformation
Dislocations
Dynamic recrystallization
Evolution
ferritic heat-resistant stainless steel
Ferritic stainless steels
Grain boundaries
Heat resistant steels
High temperature
hot deformation
Iron
microstructral evolution
Oxidation resistance
Precipitates
precipitation behavior
Stainless steel
Strain rate
Temperature
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Summary:The 0.1C-18Cr-1Al-1Si ferritic heat-resistant stainless steel has attracted considerable attention to high-temperature applications due to its favorable combination of creep and oxidation resistance. In this paper, the microstructural evolution and precipitation behavior of the 0.1C-18Cr-1Al-1Si ferritic heat-resistant stainless steel is studied from the compression deformation data in the temperature range of 850 °C-1050 °C and the strain rate range of 0.01-1 s−1. Experimental results demonstrate that higher temperatures and lower strain rates enhance the dynamic recrystallization (DRX) process with remarkable effectiveness. The main precipitates are proved as the AlN phases and the (Cr,Fe)23C6 carbides during hot deformation. With an increase in the deformation temperature, the size of (Cr,Fe)23C6 and AlN gradually increases, and volume fraction gradually decreases. When the strain rate decreases, the average size and volume fraction of (Cr,Fe)23C6 and AlN gradually increase. At the lower temperatures, the occurrence of dynamic recrystallization (DRX) is strongly influenced by (Cr,Fe)23C6 formed on the grain boundaries, mainly because it causes a pinning effect, which hinders the movement of dislocations and delays the occurrence of the DRX.
ISSN:2053-1591
2053-1591
DOI:10.1088/2053-1591/ab7d0d