Effect of Different Cooling Paths on the Microstructure and Properties of a Plain Carbon Steel

2013 ◽  
Vol 762 ◽  
pp. 171-175
Author(s):  
Jin Guo ◽  
Shui Ping Hu ◽  
Zhen Li Mi ◽  
Dong Bin Zhang
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Carbon Steel ◽  
Hot Rolling ◽  
Plain Carbon Steel ◽  
Controlled Cooling ◽  
Microstructure And Properties ◽  
Ultra Fast Cooling ◽  
Cooling Method ◽  
Fast Cooling

The effect of different cooling paths on the microstructure and properties of a plain carbon steel was carefully investigated by thermal simulation, hot rolling, tensile tests and quantitative metallography. Experimental results indicate that the more rapid the cooling rate is, the smaller the average ferritic grain size is and the higher the mechanical properties are. Both ultra fast cooling method and ultra fast cooling+accelerated controlled cooling method could refine grain size and improve mechanical properties. Without any alloy addition, using the ultra fast cooling immediately after hot rolling process, the yield strength of the plain carbon steel could reach 360 MPa and the elongation is 32%.

Plain Carbon Strip Q235 Grain Growth in Reheating Progress

2012 ◽  
Vol 528 ◽  
pp. 172-175
Author(s):  
Chun Li Mo ◽  
Shou Peng Du ◽  
Xu Ming Guo ◽  
Lie Shan Cui
Keyword(s):  
Grain Size ◽  
Carbon Steel ◽  
Grain Growth ◽  
Hot Rolling ◽  
Physical Simulation ◽  
Rolling Process ◽  
Plain Carbon Steel ◽  
Kinetics Equation ◽  
Reheat Furnace ◽  
Hot Rolling Process

Before hot rolling the ingot of plain carbon steel Q235 should be heated to austenite temperature to decrease distortion resistance. The grain size will affect the following hot rolling process. In this paper, the behaviour of Q235 grain growth in reheat furnace was studied with the method of physical simulation. To achieve the equation of grain growth in heating progress, the samples was carried out in different peak temperature and holding time at the Gleeble1500. With the kinetics equation grain size can be calculated and the results provide a basis for the setting of progress parameter during reheating of ingot.

Effect of Cooling Paths on Microstructure and Mechanical Properties of Vanadium Bearing Microalloyed Steel

2013 ◽  
Vol 749 ◽  
pp. 243-249
Author(s):  
Jun Chen ◽  
Xiang Wei Chen ◽  
Shuai Tang ◽  
Zhen Yu Liu ◽  
Guo Dong Wang
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Microalloyed Steel ◽  
Final Temperature ◽  
N Value ◽  
Ultra Fast Cooling ◽  
Microstructure And Mechanical Properties ◽  
Cooling Effects ◽  
Fast Cooling ◽  
Ferrite Grain Size

Based on ultra fast cooling, effects of cooling paths on microstructure and mechanical properties of vanadium bearing microalloyed steel were investigated by the observation of optical microscope and scanning electron microscope and the testing of mechanical properties, moreover, the work-hardening exponent was determined based on stress-strain curves. The results show that using ultra fast cooling can effectively refine ferrite grain size and the ferrite grain size is decreased as the final temperature of ultra fast cooling is decreased. In addition, the microstructure and mechanical properties can be controlled by cooling paths. The ferrite-perlite microstructure with lower strength and higher n-value of approx. 0.2 and the ferrite-bainite microstructure with higher strength and lower n-value of approx. 0.16 can be gained at the higher and lower final temperature of ultra fast cooling, respectively. And the yield ratio are all lower than 0.85.

scholarly journals Effect of hot rolling history and cooling rate on the phase transformation of plain carbon steel

2017 ◽  
Vol 55 (04) ◽  
pp. 229-236
Author(s):  
I. SCHINDLER ◽  
S. RUSZ ◽  
P. OPĚLA ◽  
J. RUSZ ◽  
Z. SOLOWSKI ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Carbon Steel ◽  
Cooling Rate ◽  
Hot Rolling ◽  
Plain Carbon Steel ◽  
Effect Of Hot Rolling

In-Situ Laser Ultrasound Measurements of Austenitic Grain Growth in Plain Carbon Steel

2021 ◽  
Author(s):  
Christian Kerschbaummayr ◽  
Martin Ryzy ◽  
Bernhard Reitinger ◽  
Mike Hettich ◽  
Jan Džugan ◽  
...  
Keyword(s):  
Grain Size ◽  
Carbon Steel ◽  
Grain Growth ◽  
Plain Carbon Steel ◽  
Ex Situ ◽  
Ultrasound Measurement ◽  
Laser Ultrasound ◽  
Austenite Grain Size ◽  
Ultrasound Measurements

Abstract The macroscopic mechanical properties like yield-strength, ductility or hardness play an important role during the steel production and the design of new steel grades. The austenite grain size is an important parameter, which influences the final microstructure and the properties of a material. When developing grain growth evolution models, typically many samples have to be treated thermally and micrographs have to be prepared ex-situ. To reduce the time expenditure of this procedure we carried out in-situ laser ultrasound measurements of austenitic grain growth in plain carbon steel (AISI 1045). A thermomechanical simulator of the type Linseis L78/RITA has been upgraded with a laser ultrasound measurement system, which enables the continuous and contactless determination of the austenite mean grain size during a thermal cycle. In this work we will show the calibration workflow and grain size results by a new attenuation model for plain carbon steel. In-situ laser ultrasound measurement data is compared with several micrographs defined at supporting points along a specified temperature program to corroborate the findings.

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