Investigation of Creep Properties and Fracture Mechanism of 430 Ferritic Stainless Steel at Elevated Temperature

• Published in: Journal of materials engineering and performance Vol. 33; no. 4; pp. 1549 - 1559
• Main Authors: Zhang, Dechang, Shen, Junjie, Li, Bo, Ruan, Taotao, Zhao, Zhihang
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.02.2024
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Corrosion and Coatings; Engineering Design; Materials Science; Quality Control; Reliability; Safety and Risk; Technical Article; Tribology; dislocation; fracture mechanism; creep properties; 430 ferritic stainless steel
• ISSN: 1059-9495; 1544-1024
• DOI: 10.1007/s11665-023-08086-y

During the continuous casting of 430 ferritic stainless steel, the broadening phenomenon and bulging deformation are considered a high-temperature creep. This study investigates 430 ferritic stainless steel by conducting high-temperature uniaxial creep experiments under the temperatures of 0.4-0.5 T m and stresses of 32.5-85 MPa. After creep deformation, the microstructure is analyzed by scanning electron microscopy, energy-dispersive spectroscopy, electron backscatter diffraction, and transmission electron microscopy. The creep curves show the “Normal type.” The creep stress exponent is 3.6-6.7. The creep activation energy is 476.533 kJ/mol. The dislocations climbed over the (Fe, Cr) 23 C 6 are observed. The creep mechanism is dislocations climbing, and the precipitation strengthening contributes to the creep deformation. The recovery and recrystallization are confirmed during the creep deformation. Temperature, not stress, is the main factor in recovery and recrystallization. Numerous voids are observed around the precipitates. There are many dimples on the fracture surface. The creep fracture mechanism belongs to the Transgranular ductile fracture.