Abstract
Designing a new family of advanced high-strength steels (AHSSs) to develop automotive parts that cover early industry needs is the aim of many investigations. One of the candidates in the 3rd family of AHSS are the quenching and partitioning (QP) steels. These steels display an excellent relationship between strength and formability, making them able to fulfill the requirements of safety, while reducing automobile weight to enhance the performance during service. The main attribute of QP steels is the TRIP effect that retained austenite possesses, which allows a significant energy absorption during deformation. The present study is focused on evaluating some process parameters, especially the partitioning temperature, in the microstructures and mechanical properties attained during a QP process. An experimental steel (0.2C-3.5Mn-1.5Si (wt%)) was selected and heated according to the theoretical optimum quenching temperature. For this purpose, heat treatments in a quenching dilatometry and further microstructural and mechanical characterization were carried out by SEM, XRD, EBSD, and hardness and tensile tests, respectively. The samples showed a significant increment in the retained austenite at an increasing partitioning temperature, but with strong penalization on the final ductility due to the large amount of fresh martensite obtained as well.
Highlights
In order to improve automobile performance, the automotive industry is continuously developing new steels aiming at reducing the automobile’s weight while enhancing the passenger’s safety
Where Fm corresponds to the austenite fraction which transforms into martensite during a quenching treatment at quenching temperature (QT), below the martensite start (Ms) temperature, and α corresponds to a rate parameter
Consequence, the current study study verified verified the the effect effect of of closer to real plied at TP1 =temperature
Summary
In order to improve automobile performance, the automotive industry is continuously developing new steels aiming at reducing the automobile’s weight while enhancing the passenger’s safety. A sort of annealing (usually called partitioning) treatment is applied where the carbon in the supersaturated martensite starts to diffuse into the untransformed austenite. This step enhances carbon enrichment in the austenite which, in turn, might be stabilized at room temperature. Additions may enhance the austenite stabilization while decreasing the Ms temperature The present work aims at designing an optimal QP process. Order toQP design an optimal thermal cycle,a work at designing anInoptimal process For this purpose, the critical temperatures and continuous cooling transformation diagram of the steel. This was correlated with the mechanical properties in trontensile backscatter terms of hardness and tensile tests
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
