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]

Issue Section:
Technical Papers
Keywords:
carbon steel, hot rolling, grain size, deformation, hot working, thermomechanical treatment
Topics:
Carbon steel, Grain size, Hot rolling, Deformation, Engineering prototypes
1.
Ammerling
,
W. J.
,
1988
, “
Application of 3-roll Technology for Rolling Specialty Rod and Bar Products
,”
Iron and Steel Eng.
,
65
, pp.
22
–
27
.
2.
Sakurai, T., Yamanaka, E., Kondo, H., Takeda, R., Karino, A., and Kunita, N., 1995, “Development of 4-roll Size-Free Rolling Technology for Bar Mill Line,” July, SEAISI 39th Conference on Recent Development of Rolling and Following Process Technology and/or Application of Steel Products, pp. 59–70.
3.
Tokunaga
,
Y.
,
Mizuyama
,
Y.
,
Inoue
,
M.
, and
Yamada
,
M.
,
1984
, “
Occurrence of Coarse Grains in Hot-rolled Low Carbon Aluminum Killed Steel Sheets Coiled at High Temperature
,”
Tetsu to Hagane
,
70-15
, pp.
2136
–
2143
.
4.
Edwards
,
G. A.
, and
Pfeil
,
L. B.
,
1924
, “
The Production of Large Crystals by Annealing Strained Iron
,”
J. Iron Steel Inst., London
,
190
, pp.
129
–
147
.
5.
Neishi
,
Y.
,
Akiyama
,
M.
,
Inoue
,
Y.
, and
Kawakami
,
K.
,
1997
, “
Development of Control Rolling Process for Suppressing Grain Coarsening of Rod and Bar
,”
J. Jpn. Soc. Technol. Plast.
,
38
, pp.
637
–
641
.
6.
Neishi
,
Y.
,
Akiyama
,
M.
,
Kuroda
,
K.
,
Inoue
,
Y.
, and
Kawakami
,
K.
,
1998
, “
Determination of Hot Sizing Conditions for Bar Rolling to Suppress the Grain Coarsening Phenomenon
,”
Wire J. Intl.
, January,
31
, pp.
92
–
97
.
7.
Neishi
,
Y.
,
Akiyama
,
M.
, and
Kuroda
,
K.
,
1998
, “
Effect of Accumulated Equivalent Plastic Strain on Grain Coarsening Phenomenon in Multistage Hot Deformation Process
,”
J. Jpn. Soc. Technol. Plast.
,
39
, pp.
1134
–
1138
.
8.
Misaka
,
Y.
, and
Yoshimoto
,
T.
,
1966
, “
Formularization of Resistance to Deformation of Plain Carbon Steels at Elevated Temperature
,”
Tetsu to Hagane
,
52
, pp.
1584
–
1587
.
9.
Yanagimoto, J., Kiuchi, M., and Inoue, Y., 1993, “Characterization of Wire and Rod Rolling with Front and Back Tensions by Three Dimensional Rigid-Plastic Finite Element Method,” in Proceedings of 4th ICTP, pp. 764–769.
Copyright © 2000
 by ASME
You do not currently have access to this content.