Abstract
This papers deals with the character on low (−180 °C) temperature fracture of iron. Microcrystalline and ultrafine-grained (UFG) iron rods were investigated. To obtain UFG material 20 mm in diameter iron rod was hydrostatically extruded (HE) in two steps: from 20 to 12 mm and from 12 to 8 mm. Because of microstructure anisotropy caused by HE mini-disc and mini-beam samples were cut off from perpendicular and longitudinal cross-section of the rods. Microcrystalline rod fractured in brittle manner at low temperature for both cross-sections, but in UFG iron fracture character depended on grain’s shape. For samples were crack propagates parallel to the grain’s elongation axis intercrystalline fracture occurred. For mini-beams were crack propagates crosswise to the grain elongation axis transcrystalline fracture occurred and force deflection curve was similar to those obtained for room temperature.
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Abbreviations
- DBTT:
-
ductile-brittle transition temperature
- UFG:
-
ultrafine-grained material
- MC:
-
microcrystalline material
- HE:
-
hydrostatic extrusion
- SPD:
-
severe plastic deformation
- SPT:
-
small punch test
- Fe20:
-
iron rod of 20 mm in diameter
- HE8:
-
iron rod of 8 mm in diameter obtained via hydrostatic extrusion
- HE8F:
-
iron rod of 8 mm in diameter obtained via HE and then flattened.
- YS:
-
yield stress
- UTS:
-
ultimate tensile stress
- RT:
-
room temperature used as the environment for test
- −180 °C:
-
temperature used as the environment for low temperature test
- F y :
-
yielding force for SPT
- F u :
-
ultimate (maximum) force for SPT
- F f :
-
fracture force for SPT
- U y :
-
yielding deflection for SPT
- U u :
-
ultimate deflection for SPT
- U f :
-
fracture deflection for SPT
- Fy_RT:
-
yielding force at room temperature
- Fu_RT:
-
ultimate force at room temperature
- Ff_RT:
-
fracture force at room temperature
- Uy_RT:
-
yielding deflection at room temperature
- Uu_RT:
-
ultimate deflection at room temperature
- Uy_RT:
-
fracture deflection at room temperature
- Fy_-180 °C:
-
yielding force at −180 °C
- Fu_-180 °C:
-
ultimate force at −180 °C
- Ff_-180 °C:
-
fracture force at −180 °C
- Uy_-180 °C:
-
yielding deflection at −180 °C
- Uu_-180 °C:
-
ultimate deflection at −180 °C
- Uy_-180 °C:
-
fracture deflection at −180 °C
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Romelczyk-Baishya, B., Łęczycki, K., Płocińska, M. et al. The effect of microstructure anisotropy on low temperature fracture of ultrafine-grained iron. Archiv.Civ.Mech.Eng 18, 1166–1182 (2018). https://doi.org/10.1016/j.acme.2018.02.014
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DOI: https://doi.org/10.1016/j.acme.2018.02.014