S.J. Yao
,
L.X. Du
,
X.H. Liu
,
G.D. Wang
金属学报(英文版)
Three warm-rolled ferrite/pearlite microstructures
were prepared by rolling at 500℃, and the austenitizing
characteristics were discussed in conjunction with deformation
during the heating stage. The results indicated that the final
austenite grain size was sensitive to the deformation direction of
the initial warm-rolled microstructure. The transient microstructure
at a given temperature was the most important influencing factor on
the austenitizing characteristic combined with deformation.
Moreover, the hot-rolled microstructure also had to be prepared in
an optimal state because of its direct effect on the warm-rolled
microstructure.
关键词:
Warm-rolled ferrite/pearlite
,
null
,
null
G.M. Cao
,
C.G. Li
,
Z.Y. Liu
,
D. Wu
,
G.D. Wang
,
X.H. Liu
金属学报(英文版)
Coupled turbulent flow, temperature fields of the twin-roll casting strip process were simulated by three-dimensional finite element method. Based on the heat balance calculation and using inverse methods between the simulations and real experiments, the relational models among casting speed, location, and coefficient of heat transfer between molten metal and rolls in different regions are given. In the simulation, the calculated surface temperatures are in good agreement with the measured values. An on-line model of kiss point is derived by simulations and the geometry of molten
pool, corresponding control strategy is also proposed.
关键词:
Twin-roll strip casting
,
null
D.S. Liu
,
G.D. Wang
,
X.H. Liu and G.Z. Cui(The State Key Laboratory of Rolling and Automation
,
Northeastern University
,
Shenyang 110006
,
China)
金属学报(英文版)
The influence of prior austenite deformed at different temperature on the subsequent continuous cooling bainitic transformation has been investigated in an C-Ma-Cr-Ni-Mo plastic die steel. The results show that the prior deformation in low temperature region of austenite retards significantly the bainitic transformation. For the same continuous cooling schedule, as austenite deformed at lower temperature, the quantity of the classical sheaf-like bainite becomes less. The present results show that severe deformation leads to mechanical stabilization of austenite and causes the difficulty of bainitic ferrite propagation into the austenite.
关键词:
plastic die steel
,
null
,
null
,
null
,
null
Y.C. Miao
,
X.M. Zhang
,
G.D. Wang
金属学报(英文版)
The position of the solidification completed temperature of twin roll stainless strip casting process is very important to the quality of the casting strip. In order to control this position, the solidification completed temperature should be known at first.The present paper first simulated dendritic microsegregation under conditions of twin roll stainless strip casting, and got the relationship between the temperature and solid fraction of the mush zone. The temperatures such as ZDT (equal to the solidification completed temperature) and LIT (liquid impenetrable temperature), et al., also were obtained. Then by using the turbulent model, the flow and thermal fields of the pool of the twin roll stainless strip casting, and the speed and temperature fields of different casting speeds were given and also explained. The results are coincident with the experimental result. Combined with the results of these two simulations. the appropriated casting speed was found.
关键词:
strip casting
,
null
,
null
,
null
,
null
J.X. Li
,
X.H. Liu
,
G.D. Wang
金属学报(英文版)
Two kinds of cold rolling experiments, single cold rolling and double cold rolling, werecarried out on one titanium stabilized interstitial free (IF) steel that has been warmrolled at ferrite temperature. The main aim was to investigate the evolution of rollingand annealing textures from the well known behavior observed under single cold rollingcondition to the less understood double cold rolling by using orientation distributionfunction (ODF). In the twice cold rolled samples, the annealing texture comprises onlyfirst round of rolling. Accordingly both the once cold rolled sample and the twice coldrolled sample with heavy reduction in the first round of rolling have much complextexture components. They are related to the formation of initial {111} subgrain andthe priority growth of stable {111} nucleus.
关键词:
double rolling
,
null
,
null
,
null
,
null
