scholarly journals Influence of carbon partitioning kinetics on final austenite fraction during quenching and partitioning

2009 ◽  
Vol 61 (2) ◽  
pp. 149-152 ◽  
Author(s):  
A.J. Clarke ◽  
J.G. Speer ◽  
D.K. Matlock ◽  
F.C. Rizzo ◽  
D.V. Edmonds ◽  
...  
Keyword(s):  
Carbon Partitioning ◽  
Quenching And Partitioning ◽  
Austenite Fraction

scholarly journals Quenching and Partitioning of Multiphase Aluminum-Added Steels

Metals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 373 ◽  
Author(s):  
Tuomo Nyyssönen ◽  
Olli Oja ◽  
Petri Jussila ◽  
Ari Saastamoinen ◽  
Mahesh Somani ◽  
...  
Keyword(s):  
Tensile Testing ◽  
Retained Austenite ◽  
Intercritical Annealing ◽  
Annealing Condition ◽  
Quenching And Partitioning ◽  
Multiphase Structure ◽  
Austenite Fraction ◽  
Quench Temperature

The quenching and partitioning response following intercritical annealing was investigated for three lean TRIP-type high-Al steel compositions. Depending on the intercritical austenite fraction following annealing, the steels assumed either a ferrite/martensite/retained austenite microstructure or a multiphase structure with ferritic, bainitic and martensitic constituents along with retained austenite. The amount of retained austenite was found to correlate with the initial quench temperature and, depending on the intercritical annealing condition prior to initial quenching, with the uniform and ultimate elongations measured in tensile testing.

Study of Retained Austenite in Q&P Steel for Automobile

2012 ◽  
Vol 482-484 ◽  
pp. 1436-1441 ◽  
Author(s):  
Bao Tong Zhuang ◽  
Hai Tao Jiang ◽  
Di Tang ◽  
Zhen Li Mi ◽  
Zhen Kuai
Keyword(s):  
Grain Boundaries ◽  
Retained Austenite ◽  
Volume Fraction ◽  
Carbon Partitioning ◽  
Maximum Volume ◽  
Quenching And Partitioning ◽  
Maximum Volume Fraction ◽  
Intercritical Region

Retained austenite of Q&P (Quenching and Partitioning) processed 0.2C-1.51Si-1.84Mn steel heated in intercritical region and full austenite region are investigated. The results show that the maximum volume fraction of retained austenite heated in intercritical and full austenite region is 13.39% and 5.23% respectively. Carbon partitioning completed within 10 s for both heating modes. The microstructure after full austenitization consisted of martensite laths and thin, inter-lath retained austenite film. Austenite blocks is observed as well after partial austenitization.The distribution of retained austenite is related to the amount of grain boundaries by EBSD techniques.

scholarly journals Microstructural Impact of Si and Ni During High Temperature Quenching and Partitioning Process in Medium-Mn Steels

2021 ◽  
Vol 52 (4) ◽  
pp. 1321-1335
Author(s):  
S. Ayenampudi ◽  
C. Celada-Casero ◽  
Z. Arechabaleta ◽  
M. Arribas ◽  
A. Arlazarov ◽  
...  
Keyword(s):  
Carbon Partitioning ◽  
Microstructural Development ◽  
Microstructure Development ◽  
Low Carbon ◽  
Design Strategies ◽  
Quenching And Partitioning ◽  
Slowing Down ◽  
Kinetics Of ◽  
Manganese Steels ◽  
Quenching And Partitioning Process

AbstractAustenite stabilization through carbon partitioning from martensite into austenite is an essential aspect of the quenching and partitioning (Q&P) process. Substitutional alloying elements are often included in the chemical composition of Q&P steels to further control the microstructure development by inhibiting carbide precipitation (silicon) and further stabilize austenite (manganese and nickel). However, these elements can interfere in the microstructure development, especially when high partitioning temperatures are considered. In this study, the microstructural development during the Q&P process of four low-carbon, medium-manganese steels with varying contents of silicon and nickel is investigated. During partitioning at 400 °C, silicon hinders cementite precipitation in primary martensite thereby assisting carbon partitioning from martensite to austenite. During partitioning at temperatures of 500 °C and 600 °C, presence of nickel inhibits pearlite formation and promotes austenite reversion, respectively. It is observed that the stabilization of austenite is significantly enhanced through the addition of nickel by slowing down the kinetics of competitive reactions that are stimulated during the partitioning stage. Results of this study provide an understanding of the interplay among carbon, silicon and nickel during Q&P processing that will allow the development of new design strategies to tailor the microstructure of this family of alloys.

scholarly journals Effects of quenching and partitioning (Q&P) technology on microstructure and mechanical properties of VC particulate reinforced wear-resistant alloy

2020 ◽  
Vol 39 (1) ◽  
pp. 588-594
Author(s):  
Bo Zhang ◽  
Song-Sheng Zeng
Keyword(s):  
Mechanical Properties ◽  
Impact Toughness ◽  
Retained Austenite ◽  
Carbon Partitioning ◽  
Wear Resistant ◽  
Quenching And Partitioning ◽  
Resistant Alloy ◽  
Mn Content ◽  
Partitioning Time ◽  
Particulate Reinforced

AbstractTo improve the wear resistance, toughness, and hardness of alloy, the quenching and partitioning (Q&P) technology was applied in the VC particulate (VCp) reinforced wear-resistant alloys, which were prepared by adding different Mn contents (2–5 wt%). The effects of partitioning time on the distribution of alloying elements shown by EDX mapping, retained austenite fraction, microstructure, macro-hardness, and impact toughness were investigated. The results showed that the effect of carbon partitioning time on the hard phase of the wear-resistant alloy was not significant. However, the carbon partitioning time greatly affected the microstructure and the mechanical properties of alloys, such as retained austenite, hardness, and impact toughness, and there was also a strong correlation with the Mn content. When the Mn content was lower (2.51 wt%), the retained austenite content increased with the carbon partitioning time, which resulted in decreased hardness and increased impact toughness. However, when the Mn content was higher (4.52 wt%), the opposite results occurred. This study provided an application of the Q&P technology in a VCp-reinforced wear-resistant alloy.

scholarly journals Hot Straining and Quenching and Partitioning of a TRIP-Assisted Steel: Microstructural Characterization and Mechanical Properties

2018 ◽  
Vol 941 ◽  
pp. 704-710
Author(s):  
Edwan Anderson Ariza ◽  
Jonathan Poplawsky ◽  
Wei Guo ◽  
André Paulo Tschiptschin
Keyword(s):  
Mechanical Properties ◽  
High Strength Steels ◽  
High Strength ◽  
Microstructural Characterization ◽  
Atom Probe ◽  
Carbon Partitioning ◽  
Carbon Accumulation ◽  
Processing Route ◽  
Carbide Formation ◽  
Quenching And Partitioning

Advanced high strength steels (AHSS), with yield strengths over 300 MPa and tensile strengths exceeding 600 MPa, are becoming more noticeable in vehicle manufacturing. A novel processing route of a TRIP-assisted steel was developed. Characterization and modelling techniques were used to establish correlations between processing, microstructure and mechanical properties. Quenching and partitioning (Q&P) and a novel process of hot straining (HS) and Q&P (HSQ&P) treatments have been applied to a TRIP-assisted steel in a Gleeble ®3S50 thermo-mechanical simulator. The heat treatments involved intercritical annealing at 800 oC and a two-step Q&P heat treatment with a partitioning time of 100 s at 400 oC. The effects of high-temperature isothermal deformation on the carbon enrichment of austenite, carbide formation and the strain-induced transformation to ferrite (SIT) mechanism were investigated. Carbon partitioning from supersaturated martensite into austenite and carbide precipitation were confirmed by means of atom probe tomography (APT). Austenite carbon enrichment was clearly observed in all specimens, and in the HSQ&P samples it was slightly greater than in Q&P, suggesting an additional carbon partitioning to austenite from ferrite formed by the SIT phenomenon. By APT, the carbon accumulation at austenite/martensite interface was clearly observed. The newly developed combined process is promising as the transformation induced plasticity can contribute to the formability and energy absorption, contributing to fill the gap of the third generation of high-strength steels.

Influence of the Partitioning Treatment on the Mechanical Properties of a 0.3C-1.5Si-3.5Mn Q&P Steel

2014 ◽  
Vol 922 ◽  
pp. 224-229 ◽  
Author(s):  
Farideh Hajy Akbary ◽  
Maria Jesus Santofimia ◽  
Jilt Sietsma
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Room Temperature ◽  
Uniform Elongation ◽  
Carbon Partitioning ◽  
Promising Method ◽  
Isothermal Treatment ◽  
Quenching And Partitioning ◽  
Concurrent Processes ◽  
Superior Mechanical Properties

The Quenching and Partitioning (Q&P) process is a promising method for developing steels with superior mechanical properties. This process includes quenching an austenitic microstructure to form a controlled fraction of martensite, an isothermal treatment (partitioning step) aiming for the partitioning of carbon from martensite to austenite and a final quench to room temperature. This paper analyses the concurrent processes of carbon partitioning and martensite tempering during the partitioning step of a 0.3C-1.5Si-3.5Mn (wt.%) Q&P steel. The influence of the martensite tempering and the carbon partitioning on the tensile strength as well as on the uniform and post-uniform elongation of the developed Q&P microstructures is investigated.

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