scholarly journals Effects of initial austenite grain size on microstructure evolution of medium carbon steel

2017 ◽  
Author(s):  
Yunli Feng ◽  
Dajian Zhang ◽  
Mingzhi Zhang ◽  
Jie Li ◽  
Jiangli Ning
Keyword(s):  
Grain Size ◽  
Carbon Steel ◽  
Microstructure Evolution ◽  
Medium Carbon Steel ◽  
Austenite Grain Size ◽  
Medium Carbon ◽  
Austenite Grain

Effect of Different Strain on Microstructure Evolution of Medium Carbon Steel

2013 ◽  
Vol 652-654 ◽  
pp. 923-928 ◽  
Author(s):  
Peng Tian ◽  
Zhi Yong Zhong ◽  
Wei Jun Hui ◽  
Rui Guo Bai ◽  
Xing Li Zhang
Keyword(s):  
Carbon Steel ◽  
Microstructure Evolution ◽  
Simulation Experiment ◽  
Volume Fraction ◽  
True Strain ◽  
Medium Carbon Steel ◽  
Controlled Cooling ◽  
Medium Carbon ◽  
The Right ◽  
Equilibrium Content

Uniaxial hot compression simulation experiment at 700°C with different true strain was carried out to study the microstructure evolution of medium carbon steel, the predominant mechanism on the cementite softening has been explored, the experimental results show that the volume fraction of deformation induced ferrite (DIF) increased with increasing true strain and even exceeds the equilibrium content. With the increase of DIF, more and more carbon atoms congregated in the boundaries such as the interface of DIF and the interphase of DIF/deformation austenite. Carbon congregation provides the right carbon content and the optimized microstructure for divorced decomposition during the process of controlled cooling. Therefore spherical or rod-like cementite and degenerated pearlite can be obtained.

Experimentally Based Study on the Effect of Initial Grain Size for Characterization of the Grain Coarsening Phenomenon During Hot Rolling of a Medium Carbon Steel

1999 ◽  
Vol 122 (1) ◽  
pp. 109-116 ◽  
Author(s):  
Yutaka Neishi ◽  
Masayoshi Akiyama ◽  
Kouichi Kuroda
Keyword(s):  
Grain Size ◽  
Carbon Steel ◽  
Hot Rolling ◽  
Hot Deformation ◽  
Medium Carbon Steel ◽  
Grain Coarsening ◽  
Medium Carbon ◽  
Light Reduction ◽  
Fine Grain ◽  
New Criterion

Laboratory experiments using a hot deformation simulator were carried out to clarify the effect of initial grain size on the grain coarsening phenomenon in hot metal working with light reduction. As an example of medium carbon steel, AISI1045 was adopted and specimens of various grain sizes were prepared by changing the thermo-mechanical histories. They were subjected to a hot deformation testing by the simulator. The threshold grain size to cause the grain coarsening phenomenon was then determined and a criterion was presented to ensure a fine grain after hot rolling. The validity of the new criterion was checked through hot rolling of bars by a prototype mill in a laboratory. [S1087-1357(00)00801-7]

The Influence of Increased Cr Content and Austenite Grain Size on the Kinetics of Phase Transformations when Cooling Hypo-Eutectoid Steel

2006 ◽  
Vol 258-260 ◽  
pp. 421-426
Author(s):  
Ignacy Wierszyłłowski
Keyword(s):  
Activation Energy ◽  
Grain Size ◽  
Carbon Steel ◽  
Phase Transformations ◽  
Austenite Phase ◽  
Eutectoid Steel ◽  
Austenite Grain Size ◽  
Cr Content ◽  
Austenite Grain ◽  
Kinetics Of

The paper presents the influence of the grain size and a little higher Cr content on the kinetics of austenite phase transformations during continuous cooling of hypo-eutectoid steel. The kinetics of austenite phase transformations during continuous cooling were determined by means of analysis of the dilatometric curves and structure investigations. The influence of the austenite grain size and the higher Cr content was analysed in two hypoeutectoid steels containing about 0.4% C. One of them had, Cr content higher, by about 1%. In both steels, the austenite grain size was changing insignificantly up to the austenitising temperature of about 950fl. Above that temperature, the austenite grain size in carbon steel grew much quicker than that in the steel with Cr addition. The austenite grain in the Cr enriched steel was smaller than that in carbon steel and, in spite of that, the duration of cooled austenite transformations were several times longer. This means that the phase transformations are much more strongly influenced by the addition of chromium slowing down carbon diffusion in austenite, than by the austenite grain size. For each phase transformation in the examined steels, the activation energy of the transformation has been determined. The activation energy of all the phase transformations varied slightly with the increase of austenitising temperature. On the basis of the obtained results, curves of true isothermal transformations have been developed for the beginning of the phase transformations in both steels, related to infinitely quick cooling down to the transformation temperature.

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