Effect of semifinished rolled product cooling rate during controlled rolling on the condition of microalloyed steel hot-worked austenite, final microstructure, and mechanical properties. Part 2. Study of the effect of semifinished rolled product cooling rate on ferrite-bainite structure formation*

Metallurgist ◽  
2012 ◽  
Vol 56 (1-2) ◽  
pp. 137-146
Author(s):  
Yu. D. Morozov ◽  
I. F. Pemov ◽  
E. A. Goli-Oglu ◽  
D. V. Nizhelsky
Keyword(s):  
Mechanical Properties ◽  
Cooling Rate ◽  
Structure Formation ◽  
Rolled Product ◽  
Microalloyed Steel ◽  
Controlled Rolling ◽  
Microstructure And Mechanical Properties ◽  
Bainite Structure ◽  
Final Microstructure

Effect of Coiling Temperature on Microstructure and Mechanical Properties of a Nb-V Microalloyed Steel

2010 ◽  
Vol 638-642 ◽  
pp. 3350-3355 ◽  
Author(s):  
M. Olasolo ◽  
P. Uranga ◽  
J.M. Rodriguez-Ibabe ◽  
B. López
Keyword(s):  
Mechanical Properties ◽  
Microalloyed Steel ◽  
Tensile Tests ◽  
Controlled Rolling ◽  
Accelerated Cooling ◽  
Coiling Temperature ◽  
Slow Cooling ◽  
Microstructure And Mechanical Properties ◽  
Hardness Peak ◽  
Tubular Specimens

The effect of coiling temperature on the microstructure and mechanical properties of a Nb-V microalloyed steel was investigated. Controlled rolling followed by accelerated cooling and coiling was simulated by means of both, uniaxial compression, using a quenching and deformation dilatometer, and torsion. Specimens were reheated at 1250º for 5-10 min, then deformed at 1150°C, =0.3, and subsequently at 900°C, =0.4, followed by rapid cooling to a temperature between 450 and 700°C where coiling was simulated by holding the specimen for one hour at the selected temperature followed by a slow cooling to room temperature. Mechanical characterization was performed by means of hardness measurements and tensile tests, using tubular specimens machined from the torsion samples. It was found that decreasing the coiling temperature the ferrite-pearlite microstructure changed to ferrite-bainite, with a hardness peak reached for coiling at 600°C-650°C.

scholarly journals Effects of the Nanostructured Fe-V-Nb Modificators on the Microstructure and Mechanical Properties of Si-Mn Steel

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Tiebao Wang ◽  
Chunxiang Cui ◽  
Kuo Jia ◽  
Lichen Zhao
Keyword(s):  
Mechanical Properties ◽  
Microalloyed Steel ◽  
Fracture Morphology ◽  
Rapid Quenching ◽  
Tem Analysis ◽  
Nanoscale Particles ◽  
Microstructure And Mechanical Properties ◽  
Nucleation Sites ◽  
Mn Steel ◽  
Better Than

The nanostructured Fe-V-Nb master alloy was prepared in vacuum rapid quenching furnace and then was added in the steel melts as modificators before casting. Next, the effects of the nanostructured Fe-V-Nb modificators on the microstructure and mechanical properties of the steel were studied. The results show that the grain size of the steel has been effectively refined, which is mainly because the dispersed nanoscale particles can produce more nucleation sites during the solidification of the liquid steel. Tensile properties and fracture morphology reveal that the yield strength and toughness of the steel modified by nanostructured Fe-V-Nb modificators are better than that of the microalloyed steel. TEM analysis shows that vanadium and niobium in the modificators exist in the form of (V, Nb) C which effectively increases the nucleation rate and leads to better mechanical properties of the steel.

scholarly journals Effect of Cooling Rate and Ti Addition on the Microstructure and Mechanical Properties in As-cast Condition of Hypereutectic High Chromium Cast Irons

2012 ◽  
Vol 52 (12) ◽  
pp. 2210-2219 ◽  
Author(s):  
Qiang Liu ◽  
Hongwei Zhang ◽  
Qiang Wang ◽  
Xiangkui Zhou ◽  
P^|^auml;r G. J^|^ouml;nsson ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cooling Rate ◽  
Cast Irons ◽  
High Chromium ◽  
Microstructure And Mechanical Properties ◽  
Cast Condition ◽  
Ti Addition
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