Study of the Hot Ductility and Fracture Mechanisms of a Medium Carbon Steel

J. Calvo, O. España, J. M. Cabrera, J. M. Prado, R. D. Morales

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The hot ductility behavior of a medium carbon steel (0.48%C, 0.742%Mn, 0.183%Si, 0.028%A1) was studied by tensile tests carried out at strains rates varying from 1.10-4 to 1.10-3 s-1 and temperatures ranging from 590°C to 960°C. Before testing, samples were treated at 1200°C for 5 minutes. Then they were cooled down to the experimental testing temperature using a cooling rate of 1 °C/s. Ductility was evaluated by measuring the reduction in area. SEM examination was also performed to characterize the fractographic aspect of the fracture surfaces. A continues diminution in ductility with decreasing temperatures was observed. This diminution was also sensitive to the strain rates tested. This ductility behavior was promoted by the different deformation modes and fracture mechanisms active and steel phases present. In the austenitic range of temperatures, two behaviors were detected. At high temperature (high ductility zone) deformation occurred by grain sliding without significant void coalescence. In the low ductility zone (low temperature), a clear intergranular fracture (grain decohesion) was apparent. At temperatures below A3, where austenite transform into ferrite or ferrite plus pearlite, ductility is still low due to strain concentration at the ferrite or pearlite networks. In contrast with low carbon steel, ductility remained low with decreasing temperatures. The typical improvement in ductility of low carbon steels at low temperatures (i.e., in the ferrite regime) was not observed in the present case.
Original languageAmerican English
Title of host publicationStudy of the Hot Ductility and Fracture Mechanisms of a Medium Carbon Steel
Pages49-54
Number of pages43
StatePublished - 1 Dec 2003
EventMaterials Science Forum -
Duration: 1 Dec 2006 → …

Publication series

NameMaterials Science Forum
Volume442
ISSN (Print)0255-5476

Conference

ConferenceMaterials Science Forum
Period1/12/06 → …

Fingerprint

carbon steels
ductility
Carbon steel
Ductility
Ferrite
ferrites
Temperature
pearlite
low carbon steels
Pearlite
Low carbon steel
strain rate
temperature
Strain rate
Steel
Testing
tensile tests
austenite
Coalescence
Austenite

Cite this

Calvo, J., España, O., Cabrera, J. M., Prado, J. M., & Morales, R. D. (2003). Study of the Hot Ductility and Fracture Mechanisms of a Medium Carbon Steel. In Study of the Hot Ductility and Fracture Mechanisms of a Medium Carbon Steel (pp. 49-54). (Materials Science Forum; Vol. 442).
Calvo, J. ; España, O. ; Cabrera, J. M. ; Prado, J. M. ; Morales, R. D. / Study of the Hot Ductility and Fracture Mechanisms of a Medium Carbon Steel. Study of the Hot Ductility and Fracture Mechanisms of a Medium Carbon Steel. 2003. pp. 49-54 (Materials Science Forum).
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abstract = "The hot ductility behavior of a medium carbon steel (0.48{\%}C, 0.742{\%}Mn, 0.183{\%}Si, 0.028{\%}A1) was studied by tensile tests carried out at strains rates varying from 1.10-4 to 1.10-3 s-1 and temperatures ranging from 590°C to 960°C. Before testing, samples were treated at 1200°C for 5 minutes. Then they were cooled down to the experimental testing temperature using a cooling rate of 1 °C/s. Ductility was evaluated by measuring the reduction in area. SEM examination was also performed to characterize the fractographic aspect of the fracture surfaces. A continues diminution in ductility with decreasing temperatures was observed. This diminution was also sensitive to the strain rates tested. This ductility behavior was promoted by the different deformation modes and fracture mechanisms active and steel phases present. In the austenitic range of temperatures, two behaviors were detected. At high temperature (high ductility zone) deformation occurred by grain sliding without significant void coalescence. In the low ductility zone (low temperature), a clear intergranular fracture (grain decohesion) was apparent. At temperatures below A3, where austenite transform into ferrite or ferrite plus pearlite, ductility is still low due to strain concentration at the ferrite or pearlite networks. In contrast with low carbon steel, ductility remained low with decreasing temperatures. The typical improvement in ductility of low carbon steels at low temperatures (i.e., in the ferrite regime) was not observed in the present case.",
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Calvo, J, España, O, Cabrera, JM, Prado, JM & Morales, RD 2003, Study of the Hot Ductility and Fracture Mechanisms of a Medium Carbon Steel. in Study of the Hot Ductility and Fracture Mechanisms of a Medium Carbon Steel. Materials Science Forum, vol. 442, pp. 49-54, Materials Science Forum, 1/12/06.

Study of the Hot Ductility and Fracture Mechanisms of a Medium Carbon Steel. / Calvo, J.; España, O.; Cabrera, J. M.; Prado, J. M.; Morales, R. D.

Study of the Hot Ductility and Fracture Mechanisms of a Medium Carbon Steel. 2003. p. 49-54 (Materials Science Forum; Vol. 442).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Calvo J, España O, Cabrera JM, Prado JM, Morales RD. Study of the Hot Ductility and Fracture Mechanisms of a Medium Carbon Steel. In Study of the Hot Ductility and Fracture Mechanisms of a Medium Carbon Steel. 2003. p. 49-54. (Materials Science Forum).