Microstructure Evolution, Hot Deformation Behavior and Processing Maps of an FeCrAl Alloy.

Area of Science:

• Materials Science
• Metallurgical Engineering

Background:

• FeCrAl alloys are susceptible to cracking during rolling due to insoluble precipitates affecting plasticity.
• Understanding hot deformation behavior is crucial for optimizing processing and preventing defects.

Purpose of the Study:

• To investigate the microstructure evolution and hot deformation behavior of an FeCrAl alloy.
• To determine the optimal hot working parameters to enhance plasticity and avoid cracking.

Main Methods:

• Compression tests were conducted across a temperature range of 750-1200 °C and strain rates of 0.01-10 s⁻¹.
• Hot processing maps were established to identify instability zones and optimal working conditions.
• Microstructural analysis of thermally simulated samples observed dynamic recrystallization.

Main Results:

• Flow stress decreased with increasing temperature and decreasing strain rate.
• Thermal deformation activation energy was calculated as 329.49 kJ/mol.
• Optimal hot working range identified at 0.69 true strain: 1050-1200 °C and 0.01-0.4 s⁻¹.
• Discontinuous dynamic recrystallization initiated above 1000 °C, leading to fine, equiaxed grains at 1150 °C.

Conclusions:

• The study successfully identified optimal hot working parameters for FeCrAl alloys, balancing temperature and strain rate.
• Understanding dynamic recrystallization is critical for controlling microstructure and improving the hot workability of FeCrAl alloys.
• The findings provide a basis for defect-free rolling and enhanced material performance.