Effect of tempering temperature on microstructure and mechanical properties of nanostructured bainitic steel

Author(s):  
Xubiao Wang ◽  
Changbo Liu ◽  
Yuman Qin ◽  
Yanguo Li ◽  
Zhinan Yang ◽  
...  
2019 ◽  
Vol 14 ◽  
pp. 729-737 ◽  
Author(s):  
P Ponguru Senthil ◽  
K Sudhakara Rao ◽  
Hillol Kumar Nandi ◽  
Vajinder Singh ◽  
Suraj Kumar ◽  
...  

2018 ◽  
Vol 941 ◽  
pp. 329-333 ◽  
Author(s):  
Jiang Ying Meng ◽  
Lei Jie Zhao ◽  
Fan Huang ◽  
Fu Cheng Zhang ◽  
Li He Qian

In the present study, the effects of ausforming on the bainitic transformation, microstructure and mechanical properties of a low-carbon rich-silicon carbide-free bainitic steel have been investigated. Results show that prior ausforming shortens both the incubation period and finishing time of bainitic transformation during isothermal treatment at a temperature slightly above the Mspoint. The thicknesses of bainitic ferrite laths are reduced appreciably by ausforming; however, ausforming increases the amount of large blocks of retained austenite/martenisite and decreases the volume fraction of retained austenite. And accordingly, ausforming gives rise to significant increases in both yield and tensile strengths, but causes noticeable decreases in ductility and impact toughness.


2012 ◽  
Vol 562-564 ◽  
pp. 39-42
Author(s):  
Hang Su ◽  
Xi Qing Zhao ◽  
Tao Pan ◽  
Xiao Rong Lei ◽  
Qing Feng Wang

Microstructure and mechanical properties in QT-Treated 9Ni steel were investigated. The detail microstructures were observed by optical microscope (OM) and transmission electron microscope (TEM). The volume fraction of austenite was estimated by XRD. Tensile test at room temperature and Charpy-V-Notch (CVN) impact test at -196°C were carried out. The results showed that the microstructure of QT-treated 9%Ni steel was composed of tempered martensite and reversed austenite. The brittle cementite was absorbed gradually by the increasing reversed austenite as the tempering temperature increased. The optimum tempering temperature range was 560°C~580°C. The reversed austenite could improve the cryogenic toughness of 9Ni steel through the combination of the scavenging effect and the TRIP effect.


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