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Temperature dependence of the static and dynamic behaviour in a quenching and partitioning processed low-Si Steel

Florian Vercruysse, Carola Celada-Casero, Bernd M. Linke, Patricia Verleysen (UGent) and Roumen Petrov (UGent)
(2020) METALS. 10(4).
Author
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Abstract
Because of their excellent combination of strength and ductility, quenching and partitioning (Q & P) steels have a great chance of being added to the third generation of advanced high strength steels. The large ductility of Q & P steels arises from the presence of 10% to 15% of retained austenite which postpones necking due to the transformation induced plasticity (TRIP) effect. Moreover, Q & P steels show promising forming properties with favourable Lankford coefficients, while their planar anisotropy is low due to a weak texture. The stability of the metastable austenite is the key to obtain tailored properties for these steels. To become part of the newest generation of advanced high strength steels, Q & P steels have to preserve their mechanical properties at dynamic strain rates and over a wide range of temperatures. Therefore, in the present study, a low-Si Q & P steel was tested at temperatures from -40 degrees C to 80 degrees C and strain rates from 0.001 s(-1) to 500 s(-1). Results show that the mechanical properties are well-preserved at the lowest temperatures. Indeed, at -40 degrees C and room temperature, no significant loss of the deformation capacity is observed even at dynamic strain rates. This is attributed to the presence of a large fraction of austenite that is so (thermally) stable that it does not transform in the absence of deformation. In addition, the high stability of the austenite decreases the elongation at high test temperatures (80 degrees C). The additional adiabatic heating in the dynamic tests causes the largest reduction of the uniform strain for the samples tested at 80 degrees C. Quantification of the retained austenite fraction in the samples after testing confirmed that, at the highest temperature and strain rate, the TRIP effect is suppressed.
Keywords
austenite stability, Q & P steel, film-type austenite, dynamic tensile properties, Q-AND-P, RETAINED AUSTENITE, MECHANICAL-PROPERTIES, MARTENSITE-TRANSFORMATION, SPECIMEN GEOMETRY, TENSILE BEHAVIOR, STRENGTH STEEL, MICROSTRUCTURE, STABILITY, MORPHOLOGY

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MLA
Vercruysse, Florian, et al. “Temperature Dependence of the Static and Dynamic Behaviour in a Quenching and Partitioning Processed Low-Si Steel.” METALS, vol. 10, no. 4, 2020, doi:10.3390/met10040509.
APA
Vercruysse, F., Celada-Casero, C., Linke, B. M., Verleysen, P., & Petrov, R. (2020). Temperature dependence of the static and dynamic behaviour in a quenching and partitioning processed low-Si Steel. METALS, 10(4). https://doi.org/10.3390/met10040509
Chicago author-date
Vercruysse, Florian, Carola Celada-Casero, Bernd M. Linke, Patricia Verleysen, and Roumen Petrov. 2020. “Temperature Dependence of the Static and Dynamic Behaviour in a Quenching and Partitioning Processed Low-Si Steel.” METALS 10 (4). https://doi.org/10.3390/met10040509.
Chicago author-date (all authors)
Vercruysse, Florian, Carola Celada-Casero, Bernd M. Linke, Patricia Verleysen, and Roumen Petrov. 2020. “Temperature Dependence of the Static and Dynamic Behaviour in a Quenching and Partitioning Processed Low-Si Steel.” METALS 10 (4). doi:10.3390/met10040509.
Vancouver
1.
Vercruysse F, Celada-Casero C, Linke BM, Verleysen P, Petrov R. Temperature dependence of the static and dynamic behaviour in a quenching and partitioning processed low-Si Steel. METALS. 2020;10(4).
IEEE
[1]
F. Vercruysse, C. Celada-Casero, B. M. Linke, P. Verleysen, and R. Petrov, “Temperature dependence of the static and dynamic behaviour in a quenching and partitioning processed low-Si Steel,” METALS, vol. 10, no. 4, 2020.
@article{8658874,
  abstract     = {{Because of their excellent combination of strength and ductility, quenching and partitioning (Q & P) steels have a great chance of being added to the third generation of advanced high strength steels. The large ductility of Q & P steels arises from the presence of 10% to 15% of retained austenite which postpones necking due to the transformation induced plasticity (TRIP) effect. Moreover, Q & P steels show promising forming properties with favourable Lankford coefficients, while their planar anisotropy is low due to a weak texture. The stability of the metastable austenite is the key to obtain tailored properties for these steels. To become part of the newest generation of advanced high strength steels, Q & P steels have to preserve their mechanical properties at dynamic strain rates and over a wide range of temperatures. Therefore, in the present study, a low-Si Q & P steel was tested at temperatures from -40 degrees C to 80 degrees C and strain rates from 0.001 s(-1) to 500 s(-1). Results show that the mechanical properties are well-preserved at the lowest temperatures. Indeed, at -40 degrees C and room temperature, no significant loss of the deformation capacity is observed even at dynamic strain rates. This is attributed to the presence of a large fraction of austenite that is so (thermally) stable that it does not transform in the absence of deformation. In addition, the high stability of the austenite decreases the elongation at high test temperatures (80 degrees C). The additional adiabatic heating in the dynamic tests causes the largest reduction of the uniform strain for the samples tested at 80 degrees C. Quantification of the retained austenite fraction in the samples after testing confirmed that, at the highest temperature and strain rate, the TRIP effect is suppressed.}},
  articleno    = {{509}},
  author       = {{Vercruysse, Florian and Celada-Casero, Carola and Linke, Bernd M. and Verleysen, Patricia and Petrov, Roumen}},
  issn         = {{2075-4701}},
  journal      = {{METALS}},
  keywords     = {{austenite stability,Q & P steel,film-type austenite,dynamic tensile properties,Q-AND-P,RETAINED AUSTENITE,MECHANICAL-PROPERTIES,MARTENSITE-TRANSFORMATION,SPECIMEN GEOMETRY,TENSILE BEHAVIOR,STRENGTH STEEL,MICROSTRUCTURE,STABILITY,MORPHOLOGY}},
  language     = {{eng}},
  number       = {{4}},
  pages        = {{22}},
  title        = {{Temperature dependence of the static and dynamic behaviour in a quenching and partitioning processed low-Si Steel}},
  url          = {{http://dx.doi.org/10.3390/met10040509}},
  volume       = {{10}},
  year         = {{2020}},
}
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