Cleavage Fracture of the Air Cooled Medium Carbon Microalloyed Forging Steels with Heterogeneous Microstructures
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Cleavage fracture of the V and Ti-V microalloyed forging steels was investigated by the four-point bending testing of the notched specimens of Griffith-Owen’s type at −196◦ C, in conjunction with the finite element analysis and the fractographic examination by scanning electron microscopy. To assess the mixed microstructure consisting mostly of the acicular ferrite, alongside proeutectoid ferrite grains and pearlite, the samples were held at 1250◦ C for 30 min and subsequently cooled instill air. Cleavage fracture was initiated in the matrix under the high plastic strains near the notch root of the four-point bending specimens without the participation of the second phase particles in the process. Estimated values of the effective surface energy for the V and the Ti-V microalloyed steel of 37 Jm−2 and 74 Jm−2, respectively, and the related increase of local critical fracture stress were attributed to the increased content of the acicular ferrite. It was concluded that the observed incr...ease of the local stress for cleavage crack propagation through the matrix was due to the increased number of the high angle boundaries, but also that the acicular ferrite affects the cleavage fracture mechanism by its characteristic stress–strain response with relatively low yield strength and considerable ductility at −196◦ C.
Ključne reči:
Acicular ferrite / Cleavage fracture stress / Heterogeneous microstructure / Medium carbon forging steel / Microalloyed steelIzvor:
Materials, 2022, 15, 5, 1760-Izdavač:
- MDPI
Finansiranje / projekti:
DOI: 10.3390/ma15051760
ISSN: 1996-1944
WoS: 000769223400001
Scopus: 2-s2.0-85125193185
Institucija/grupa
Tehnološko-metalurški fakultetTY - JOUR AU - Jovanović, Gvozden AU - Glišić, Dragomir AU - Dikić, Stefan AU - Radović, Nenad AU - Patarić, Aleksandra PY - 2022 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5310 AB - Cleavage fracture of the V and Ti-V microalloyed forging steels was investigated by the four-point bending testing of the notched specimens of Griffith-Owen’s type at −196◦ C, in conjunction with the finite element analysis and the fractographic examination by scanning electron microscopy. To assess the mixed microstructure consisting mostly of the acicular ferrite, alongside proeutectoid ferrite grains and pearlite, the samples were held at 1250◦ C for 30 min and subsequently cooled instill air. Cleavage fracture was initiated in the matrix under the high plastic strains near the notch root of the four-point bending specimens without the participation of the second phase particles in the process. Estimated values of the effective surface energy for the V and the Ti-V microalloyed steel of 37 Jm−2 and 74 Jm−2, respectively, and the related increase of local critical fracture stress were attributed to the increased content of the acicular ferrite. It was concluded that the observed increase of the local stress for cleavage crack propagation through the matrix was due to the increased number of the high angle boundaries, but also that the acicular ferrite affects the cleavage fracture mechanism by its characteristic stress–strain response with relatively low yield strength and considerable ductility at −196◦ C. PB - MDPI T2 - Materials T1 - Cleavage Fracture of the Air Cooled Medium Carbon Microalloyed Forging Steels with Heterogeneous Microstructures IS - 5 SP - 1760 VL - 15 DO - 10.3390/ma15051760 ER -
@article{ author = "Jovanović, Gvozden and Glišić, Dragomir and Dikić, Stefan and Radović, Nenad and Patarić, Aleksandra", year = "2022", abstract = "Cleavage fracture of the V and Ti-V microalloyed forging steels was investigated by the four-point bending testing of the notched specimens of Griffith-Owen’s type at −196◦ C, in conjunction with the finite element analysis and the fractographic examination by scanning electron microscopy. To assess the mixed microstructure consisting mostly of the acicular ferrite, alongside proeutectoid ferrite grains and pearlite, the samples were held at 1250◦ C for 30 min and subsequently cooled instill air. Cleavage fracture was initiated in the matrix under the high plastic strains near the notch root of the four-point bending specimens without the participation of the second phase particles in the process. Estimated values of the effective surface energy for the V and the Ti-V microalloyed steel of 37 Jm−2 and 74 Jm−2, respectively, and the related increase of local critical fracture stress were attributed to the increased content of the acicular ferrite. It was concluded that the observed increase of the local stress for cleavage crack propagation through the matrix was due to the increased number of the high angle boundaries, but also that the acicular ferrite affects the cleavage fracture mechanism by its characteristic stress–strain response with relatively low yield strength and considerable ductility at −196◦ C.", publisher = "MDPI", journal = "Materials", title = "Cleavage Fracture of the Air Cooled Medium Carbon Microalloyed Forging Steels with Heterogeneous Microstructures", number = "5", pages = "1760", volume = "15", doi = "10.3390/ma15051760" }
Jovanović, G., Glišić, D., Dikić, S., Radović, N.,& Patarić, A.. (2022). Cleavage Fracture of the Air Cooled Medium Carbon Microalloyed Forging Steels with Heterogeneous Microstructures. in Materials MDPI., 15(5), 1760. https://doi.org/10.3390/ma15051760
Jovanović G, Glišić D, Dikić S, Radović N, Patarić A. Cleavage Fracture of the Air Cooled Medium Carbon Microalloyed Forging Steels with Heterogeneous Microstructures. in Materials. 2022;15(5):1760. doi:10.3390/ma15051760 .
Jovanović, Gvozden, Glišić, Dragomir, Dikić, Stefan, Radović, Nenad, Patarić, Aleksandra, "Cleavage Fracture of the Air Cooled Medium Carbon Microalloyed Forging Steels with Heterogeneous Microstructures" in Materials, 15, no. 5 (2022):1760, https://doi.org/10.3390/ma15051760 . .