C Gheorghies
,
I Crudu
,
C Teletin
,
C Spanu
钢铁研究学报(英文版)
A theoretical model adapted for studying steel continuous casting technology was proposed. The model based on system theory contained input/output, command, and control parameters. The process was divided into five stages, ie, tundish, mold, guiding system, guidingdrawing system, and guidingdrawingsoft reduction system. The model can be used to describe the physicochemical processes, thermal processes, chemical processes, and characteristics of the cast material according to the abovementioned stages. It can also be applied to other metallurgical technologies and even to other industries (chemistry, food, etc).
关键词:
steel;casting technology;system theory;modeling
C Gheorghies
,
S ConduracheBota
钢铁研究学报(英文版)
Measuring the thickness of steel plates during the hot rolling process is crucial for getting the necessary feedback to obtain the desired values at room temperature. The dilatation and the phase transformations that steel suffers during it's heating and subsequent cooling when rolled strongly influence the results of thickness measurements. The radiometric method provides the necessary means to make real-time and fully automatized measurements of steel thickness during rolling, if only the temperature correction is precisely known and taken into consideration. This article proves that the experimental results concerning the relative variation of steel thickness and of it's corresponding mass-thickness variation can be correctly explained by means of the theory of metal dilatation correlated with the theory of nuclear radiation absorption when passing through a metal or metallic alloy, such as steel.
关键词:
steel;hot rolling;dilatation;phase transformation;temperature correction;gamma rays;X-rays;attenuation
C Gheorghies
,
L Palaghian
,
S Baicean
,
M Buciumeanu
,
S Ciortan
钢铁研究学报(英文版)
The way to characterize the behaviour of a naval steel grade E36 subjected to the corrosive fatigue process is investigated. The tests were carried out by bending fatigue of plate specimens with thickness of 10 mm in the corrosive environment consisting of an aqueous solution of 35% of NaCl which is similar to seawater. Experimental results show that the principal mechanism of degradation of the superficial layer is based on the pit evolution, evidenced by electrochemical, micro and macro structural timely changes such as evolution of electrode potential, evolution of current density, polarization resistance, anodic and cathodic parameters, and dislocation density evolution.
关键词:
naval steel
,
fatigue
,
pitting corrosion
,
structure
