Microstructural evolution and consequent strengthening through niobium-microalloying in a low carbon quenched and partitioned steel

2015 ◽  
Vol 641 ◽  
pp. 242-248 ◽  
Author(s):  
Jun Zhang ◽  
Hua Ding ◽  
R.D.K. Misra ◽  
Chao Wang
Keyword(s):  
Microstructural Evolution ◽  
Low Carbon ◽  
Niobium Microalloying

Microstructure and Mechanical Properties of a Low-Carbon Steel Treated by One-Step Quenching and Partitioning Process

2014 ◽  
Vol 1082 ◽  
pp. 202-207 ◽  
Author(s):  
Shu Yan ◽  
Xiang Hua Liu
Keyword(s):  
Mechanical Properties ◽  
Carbon Steel ◽  
Microstructural Evolution ◽  
Retained Austenite ◽  
Uniform Elongation ◽  
Low Carbon Steel ◽  
Total Elongation ◽  
Low Carbon ◽  
Quenching And Partitioning ◽  
Partitioning Time

A low carbon steel was treated by quenching and partitioning (Q&P) process, and a detailed characterization of the microstructural evolution and testing of mechanical properties were carried out. The resulted mechanical properties indicate that with the partitioning time increasing, the tensile strength decreases rapidly first and then remains stable, and the total elongation increases first then decreases. The investigated steel subjected to Q&P process exhibits excellent products of strength and elongation (17.8-20.6 GPa•%). The microstructural evolution of martensite matrix during the partitioning step was observed, and the morphology and content of retained austenite were characterized. The working hardening behavior of the samples was analyzed, and the retained austenite with higher carbon content contributes to the uniform elongation more effectively.

Hydrogen permeation behavior in relation to microstructural evolution of low carbon bainitic steel weldments

2016 ◽  
Vol 112 ◽  
pp. 180-193 ◽  
Author(s):  
Liangyun Lan ◽  
Xiangwei Kong ◽  
Zhiyong Hu ◽  
Chunlin Qiu ◽  
Dewen Zhao ◽  
...  
Keyword(s):  
Microstructural Evolution ◽  
Hydrogen Permeation ◽  
Bainitic Steel ◽  
Low Carbon

scholarly journals Effect of High Ti Contents on Austenite Microstructural Evolution During Hot Deformation in Low Carbon Nb Microalloyed Steels

Metals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 165 ◽  
Author(s):  
Leire García-Sesma ◽  
Beatriz López ◽  
Beatriz Pereda
Keyword(s):  
Microstructural Evolution ◽  
Hot Deformation ◽  
Solute Drag ◽  
Carbon Steels ◽  
Microalloyed Steels ◽  
Low Carbon ◽  
Grain Sizes ◽  
Austenite Recrystallization ◽  
Pancaked Austenite

This work has focused on the study of hot working behavior of Ti-Nb microalloyed steels with high Ti contents (> 0.05%). The role of Nb during the hot deformation of low carbon steels is well known: it mainly retards austenite recrystallization, leading to pancaked austenite microstructures before phase transformation and to refined room temperature microstructures. However, to design rolling schedules that result in properly conditioned austenite microstructures, it is necessary to develop models that take into account the effect of high Ti concentrations on the microstructural evolution of austenite. To that end, in this work torsion tests were performed to investigate the microstructural evolution during hot deformation of steels microalloyed with 0.03% Nb and different high Ti concentrations (0.05%, 0.1%, 0.15%). It was observed that the 0.1% and 0.15% Ti additions resulted in retarded softening kinetics at all the temperatures. This retardation can be mainly attributed to the solute drag effect exerted by Ti in solid solution. The precipitation state of the steels after reheating and after deformation was characterized and the applicability of existing microstructural evolution models was also evaluated. Determined recrystallization kinetics and recrystallized grain sizes reasonably agree with those predicted by equations previously developed for Nb-Ti microalloyed steels with lower Ti concentrations (<0.05%).

scholarly journals Microstructural evolution, recovery and recrystallization kinetics of isothermally annealed ultra low carbon steel

2020 ◽  
Vol 7 (1) ◽  
pp. 016554
Author(s):  
Siuli Dutta ◽  
Ashis K Panda ◽  
Amitava Mitra ◽  
Subrata Chatterjee ◽  
Rajat K Roy
Keyword(s):  
Carbon Steel ◽  
Microstructural Evolution ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Recrystallization Kinetics ◽  
Ultra Low Carbon Steel ◽  
Kinetics Of
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