Microstructure and Mechanical Properties of an Ultrahigh-Strength 40SiMnNiCr Steel during the One-Step Quenching and Partitioning Process

2010 ◽  
Vol 41 (5) ◽  
pp. 1284-1300 ◽  
Author(s):  
H.Y. Li ◽  
X.W. Lu ◽  
W.J. Li ◽  
X.J. Jin
Keyword(s):  
Mechanical Properties ◽  
Quenching And Partitioning ◽  
Ultrahigh Strength ◽  
Microstructure And Mechanical Properties ◽  
One Step ◽  
The One ◽  
Step Quenching ◽  
Quenching And Partitioning Process

Dilatometer Analysis of the One Step Quenching and Partitioning Process in a 1.5%Si Steel

2014 ◽  
Vol 783-786 ◽  
pp. 880-885
Author(s):  
David Martin ◽  
Johan Eliasson ◽  
Bengt Brolund ◽  
Ylva Granbom
Keyword(s):  
Phase Transformation ◽  
X Ray Diffraction ◽  
Quenching And Partitioning ◽  
X Ray ◽  
Final Microstructure ◽  
Different Temperatures ◽  
One Step ◽  
The One ◽  
Step Quenching ◽  
Quenching And Partitioning Process

A one step quenching and partitioning process was applied to a 0.2%C-2.0%Mn-0.5%Cr-1.5%Si steel by quenching austenitised samples to several different temperatures below the experimentallydetermined martensite start temperature of 397 °C and isothermally partitioning them beforequenching to room temperature using a quenching deformation dilatometer. These treatmentsyielded predominantly martensitic microstructures containing 5.6 vol.% to 7.5 vol.% retained austenite,as measured by x-ray diffraction. In each treatment, strong dilation was recorded during isothermalpartitioning, with little indication of phase transformation during subsequent cooling to room temperature.This behaviour lends weight to the idea that an isothermal phase transformation occurred duringpartitioning, and that the final microstructure is a mixture of athermally and isothermally formed constituents.These results also suggest that the final microstructure of this steel is mostly formed beforeand during partitioning.

Mechanical Properties of a High Si and Mn Steel Heat Treated by One-Step Quenching and Partitioning

Metallurgist ◽  
2015 ◽  
Vol 59 (1-2) ◽  
pp. 90-96 ◽  
Author(s):  
Hamid Reza Ghazvinloo ◽  
Abbas Honarbakhsh-Raouf ◽  
Ali Reza Kiani Rashid
Keyword(s):  
Mechanical Properties ◽  
Quenching And Partitioning ◽  
Heat Treated ◽  
One Step ◽  
Mn Steel ◽  
Step Quenching ◽  
Steel Heat

scholarly journals Effect of V Addition on Microstructure and Mechanical Properties in C–Mn–Si Steels after Quenching and Partitioning Processes

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1306
Author(s):  
Gong-Ting Zhang ◽  
Na-Qiong Zhu ◽  
Bo-Wei Sun ◽  
Zheng-Zhi Zhao ◽  
Zhi-Wang Zheng ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Retained Austenite ◽  
Volume Fraction ◽  
Quenching And Partitioning ◽  
Microstructure Observation ◽  
Microstructure And Mechanical Properties ◽  
Transmission Electron ◽  
Work Hardening Rate ◽  
One Step ◽  
Partitioning Time

Three C-Si-Mn Q&P steels with different V addition after one-step and two-step quenching and partitioning (Q&P) processes were investigated by means of optical microstructure observation, X-ray diffraction (XRD) measurement, transmission electron microscopy (TEM) characterization and particle size distribution (PSD) analysis. The effect of V addition on strength and ductility of the steels was elucidated by comparative analysis on the microstructure and mechanical properties as functions of partitioning time and temperature. For one-step Q&P treatment, the mechanical properties were mainly controlled by the tempering behavior of martensite during partitioning. V addition was helpful to mitigate the deterioration of mechanical properties by precipitation strengthening and grain refinement strengthening. For two-step Q&P treatment, the satisfying plasticity was attributed to the transformation-induced plasticity (TRIP) effect of retained austenite maintaining the high work hardening rate at high strain regime. The higher volume fraction of retained austenite with high stability resulted from the refined microstructure and the promoted carbon partitioning for the steel with 0.16 wt% V addition. However, the carbon consumption due to the formation of VC carbides led to the strength reduction of tempered martensite.

scholarly journals The Effect of Quenching and Partitioning (Q&P) Heat Treatment on the Microstructure and Mechanical Properties of High Boron Steel

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1556
Author(s):  
Zhao Li ◽  
Run Wu ◽  
Mingwei Li ◽  
Song-Sheng Zeng ◽  
Yu Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Volume Fraction ◽  
Martensitic Steel ◽  
Boron Steel ◽  
Quenching And Partitioning ◽  
Effect Mechanism ◽  
Microstructure And Mechanical Properties ◽  
High Boron ◽  
Cast Condition

High boron steel is prone to brittle failure due to the boride distributed in it with net-like or fishbone morphology, which limit its applications. The Quenching and Partitioning (Q&P) heat treatment is a promising process to produce martensitic steel with excellent mechanical properties, especially high toughness by increasing the volume fraction of retained austensite (RA) in the martensitic matrix. In this work, the Q&P heat treatment is used to improve the inherent defect of insufficient toughness of high boron steel, and the effect mechanism of this process on microstructure transformation and the change of mechanical properties of the steel has also been investigated. The high boron steel as-casted is composed of martensite, retained austensite (RA) and eutectic borides. A proper quenching and partitioning heat treatment leads to a significant change of the microstructure and mechanical properties of the steel. The net-like and fishbone-like boride is partially broken and spheroidized. The volume fraction of RA increases from 10% in the as-cast condition to 19%, and its morphology also changes from blocky to film-like. Although the macro-hardness has slightly reduced, the toughness is significantly increased up to 7.5 J·cm−2, and the wear resistance is also improved.

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