The Effect of Stress on Bainite Transformation, Microstructure, and Properties of a Low‐Carbon Bainitic Steel

2019 ◽  
Vol 90 (10) ◽  
pp. 1900159 ◽  
Author(s):  
Man Liu ◽  
Guang Xu ◽  
Junyu Tian ◽  
Qing Yuan ◽  
Mingxing Zhou ◽  
...  
Keyword(s):  
Bainitic Steel ◽  
Low Carbon ◽  
Bainite Transformation ◽  
Microstructure And Properties

scholarly journals Effect of Austempering below and above Ms on the Microstructure and Wear Performance of a Low-Carbon Bainitic Steel

Metals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 104
Author(s):  
Zhirui Wei ◽  
Haijiang Hu ◽  
Man Liu ◽  
Junyu Tian ◽  
Guang Xu
Keyword(s):  
Impact Toughness ◽  
Low Carbon Steel ◽  
Total Elongation ◽  
Bainitic Steel ◽  
Low Carbon ◽  
Bainite Transformation ◽  
Wear Performance ◽  
Isothermal Temperature ◽  
Considerable Impact ◽  
Fresh Martensite

The microstructure and wear performance of a low-carbon steel treated by austempering below and above martensite start temperature (Ms) were investigated. The results show that the bainite, fresh martensite (FM) and retained austenite (RA) were observed in samples austempered above Ms. Except for the three above phases, the athermal martensite (AM) was also observed in samples austempered below Ms. The bainite transformation was accelerated and finer bainite was obtained due to the AM formation in samples austempered below Ms. In addition, the strength and hardness were improved with the decrease of the isothermal temperature and time, whereas the total elongation decreased with the increasing isothermal time and the decreasing isothermal temperature. Moreover, the materials austempered below Ms exhibited better wear performance than the ones treated above Ms, which is attributed to the improved impact toughness by the finer bainite and the enhanced hardness by AM. The best wear resistance was obtained in the samples austempered at 300 °C below Ms for 200 s, due to the highest hardness and considerable impact toughness.

Effect of Hot Deformation and Cooling Rate on Phase Transformations in Low Carbon HN5MVNb Bainitic Steel

2007 ◽  
Vol 539-543 ◽  
pp. 4620-4625 ◽  
Author(s):  
Andrzej Kazimierz Lis ◽  
Jadwiga Lis
Keyword(s):  
Cooling Rate ◽  
Local Equilibrium ◽  
Bainitic Steel ◽  
Low Carbon ◽  
Transformation Mechanism ◽  
Bainite Transformation ◽  
Equilibrium Conditions ◽  
Cooling Rates ◽  
Kinetics Of ◽  
Transformation Processes

Deformations at temperatures 900 °C, 860 °C, 810 °C and 780 °C in the consecutive amounts 24%, 20%, 19% and 18.5% were applied to low carbon HN5MVNb bainitic steel using hot compression testing in dilatometer Bähr 805 followed by continuous cooling. The results show clearly that the kinetics of the austenite decomposition were depended on local equilibrium conditions between recovery, recrystallization and phase transformation processes for a given cooling rate. Bainite transformation was accelerated when sample was cooled after deformation at cooling rate 60 °C/s. At lower cooling rates than 5 °C/s down to 0.5 °C/s, bainite transformation was postpone when comparing its kinetics with those for non deformed steel. The bainitic transformation cannot be fitted to a single transformation mechanism owing to the formation of carbides. Different behavior was observed for austenite to ferrite transformation. Usually it was accelerated with consecutive deformations of the steel for all cooling rates used in experiments.

Influence of Relaxation Process on the Microstructure and Properties of Low Carbon Bainitic Steel

2003 ◽  
Vol 426-432 ◽  
pp. 1439-1444 ◽  
Author(s):  
Cheng Jia Shang ◽  
Shan Wu Yang ◽  
Xue Min Wang ◽  
Hui Bin Wu ◽  
Xin Lai He
Keyword(s):  
Relaxation Process ◽  
Bainitic Steel ◽  
Low Carbon ◽  
Microstructure And Properties

The Influence of Ti/N Ratio on the Effective Boron and Mechanical Properties of Low Carbon Boron Alloyed Bainitic Steel

2014 ◽  
Vol 496-500 ◽  
pp. 392-395 ◽  
Author(s):  
Tao Zhang ◽  
Hua Xing Hou ◽  
Jun Ping Chen
Keyword(s):  
Mechanical Properties ◽  
Steel Plate ◽  
Steel Plates ◽  
Bainitic Steel ◽  
Low Carbon ◽  
Obvious Effect ◽  
Ti Content

The influence of Ti/N ratio on the effective boron and mechanical properties was investigated by analyzing data from low carbon boron alloyed bainitic steel plates. The result shows Ti/N ratio varies with effective boron value. Less than 50% effective boron was obtained when Ti/N ratio is below 3.3, nearly 90% effective boron is obtained when ratio Ti/N is more than 4; Adding enough Titanium is an effective and economic way to improve qualified ratio of bainitic steel plate. The Ti content between 0.010% and 0.030% does not have obvious effect on the toughness of the bainitic steel;

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