ZHAO De-wen
,
ZHANG Shun-hu
,
LI Can-ming
,
SONG Hong-yu
,
WANG Guo-dong
钢铁研究学报(英文版)
The dual-stream function velocity field is reduced in order to analyze two-dimensional plate broadside rolling in roughing. The strain rate vector inner product and integral mean value theorem, as well as co-line vector inner product are used respectively in plastic deformation power, friction losses and shear power. A theoretical solution of roll torque and separating force for the rolling is obtained and the calculated results by the solution are compared with those measured in broadside rolling on-line. It shows that both the force and torque calculated are higher than those of measured, but the maximum relative error between them is no more than 11%.
关键词:
broadside rolling
,
roll separating force
,
strain rate vector
,
inner product
,
analytical solution
SUN Wei-hua
,
WANG Guo-dong
钢铁研究学报(英文版)
Static and dynamic continuous cooling transformation (CCT) on 610MPa HSLA Steel Plate for 150,000 m3 Oil Storage Tank Construction were carried out on a MMS200 thermo-mechanical simulation system. It has found that with cooling rate increases pre-eutectoid ferrite, pearlite, granular bainite and lathing bainite will appear in the transformed microstructure. In comparison with static CCT, the transforming points of acicular ferrite, granular bainite and lathing bainite in the dynamic CCT curve shift to the left proving an increased acicular ferrite and bainite transformation area.
关键词:
steel plate for oil storage;microstructure transformation;CCT-curve;non-quenching and tempering
ZHOU Guo-ping
,
LIU Zhen-yu
,
YU Shi-chuan
,
CHEN Jun
,
QIU Yi-qing
,
WANG Guo-dong
钢铁研究学报(英文版)
The formation of phosphorous surface inverse segregation (SIS) in twin-roll cast strips of low-carbon steels was studied. High phosphorous strips were fabricated by using a pilot twin-roll strip caster and a melt/substrate contacting apparatus, respectively. Solidification structures of strips were observed and analyzed, and phosphorus distributions along longitudinal sections of strips were investigated and discussed. The results showed that solidification structures of all strips were columnar grains, either integrated or coarse in the strip made by the melt/substrate contacting apparatus or damaged in some degree in cast strips; and that during cast strip solidification, enrichment of phosphorus occurred between columnar grains, and the average phosphorus concentration near the surface in the strip with 015% of phosphorus was measured to be about 027% which was obviously higher than that in the bulk.
关键词:
strip casting
,
phosphorus enrichment
,
inverse segregation
,
steel
,
solidification
