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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Ariza-Echeverri, E. A. [1] ; Masoumi, M. [2] ; Nishikawa, A. S. [1, 3] ; Mesa, D. H. [4] ; Marquez-Rossy, A. E. [5] ; Tschiptschin, A. P. [1]
Total Authors: 6
Affiliation:
[1] Univ Sao Paulo, Dept Met & Mat Engn, Av Prof Mello Moraes 2463, BR-05508030 Sao Paulo, SP - Brazil
[2] Fed Univ ABC, Ctr Engn Modelling & Appl Social Sci, BR-09210580 Santo Andre, SP - Brazil
[3] Delft Univ Technol, Dept Mat Sci & Engn, Mekelweg 2, NL-2628 CD Delft - Netherlands
[4] Univ Tecnol Pereira, Mech Technol Program, Pereira, Risaralda - Colombia
[5] Oak Ridge Natl Lab, Deposit Sci & Technol Grp, Oak Ridge, TN 37830 - USA
Total Affiliations: 5
Document type: Journal article
Source: MATERIALS & DESIGN; v. 186, JAN 15 2020.
Web of Science Citations: 0
Abstract

A novel quenching and partitioning process (Q\&P) including the hot stamping (HS) process was studied, using two stamping temperatures (750 degrees C and 800 degrees C) and two quenching temperatures (318 degrees C and 328 degrees C). This combination is here called Hot Stamping and Quenching and Partitioning process (HSQ\&P). The partitioning step was performed at 400 degrees 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., < 111 > and < 112 >) were observed. Finally, subsize tensile test verified the optimum mechanical behavior of HSQ\&P specimens. (c) 2019 Published by Elsevier Ltd. (AU)

FAPESP's process: 14/11793-4 - Experimental and numerical analysis of high-strength structural steels during hot stamping and quenching and partitioning processes
Grantee:Andre Paulo Tschiptschin
Support type: Regular Research Grants