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Title: Development of a new generation of quench and partitioning steels: Influence of processing parameters on texture, nanoindentation, and mechanical properties

Journal Article · · Materials & Design
ORCiD logo [1];  [2];  [3];  [4];  [5];  [1]
  1. Univ. of Sao Paulo (Brazil)
  2. Federal Univ. of ABC (Brazil). Center of Engineering, Modelling and Applied Social Sciences
  3. Univ. of Sao Paulo (Brazil); Delft Univ. of Technology (Netherlands)
  4. Univ. Tecnológica de Pereira (Colombia). Mechanical Technology Program
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

A novel quenching and partitioning process (Q&P) including the hot stamping (HS) process was studied, using two stamping temperatures (750 °C and 800 °C) and two quenching temperatures (318 °C and 328 °C). This combination is here called Hot Stamping and Quenching and Partitioning process (HSQ&P). The partitioning step was performed at 400 °C for 100 s in all cycles. Microstructural features were comprehensively studied using electron backscattered diffraction and nanoindentation techniques. HSQ&P samples showed a good combination of ductility and high-strength due to the presence of: retained austenite, inter-critical ferrite with low stored internal strain energy, grain refinement via DIFT-effect (deformation induced ferrite transformation), martensite, and bainite. Significant internal stress relief was caused by carbon partitioning, which was induced by the DIFT-effect and the partitioning stage. This also led to a considerable stored energy, which was characterized by the Kernel average dislocation and geometrically necessary dislocation analysis. In addition, predominant {110}//strain direction crystallographic texture was identified, which promotes slip deformation and enhances the mechanical properties. Moreover, remarkable amounts of fine film-like retained austenite oriented along compact crystallographic directions (i.e., $$\langle$$111$$\rangle$$ and $$\langle$$112$$\rangle$$) were observed. Finally, subsize tensile test verified the optimum mechanical behavior of HSQ&P specimens.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1606777
Journal Information:
Materials & Design, Vol. 186, Issue C; ISSN 0264-1275
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 23 works
Citation information provided by
Web of Science

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