Search

Your search keyword '"CAI Kai-ke"' showing total 6 results
Start Over Author "CAI Kai-ke"
6 results on '"CAI Kai-ke"'

1. Evolution mechanisms of MgO-Al2O3 in non-oriented silicon steel

Author

SUN Yan-hui, ZHAO Yong, CAI Kai-ke, SUN Sai-yang, MA Zhi-fei, and FANG Zhong-qiang

Subjects
steelmaking, silicon steel, inclusions, spinels, calcium treatment, modification, Mining engineering. Metallurgy, TN1-997, Environmental engineering, TA170-171
Abstract

The evolution mechanisms of MgO-Al2O3 in the process of calcium treatment in non-oriented silicon steel were studied by laboratory experiments, with focus on the evolution process in the early and middle of calcium treatment. A small amount of MgO-Al2O3 surrounded by AlN was occasionally detected besides many pure spinels before calcium treatment. CaS or CaO formed as a tran-sient inclusion in the MgO-Al2O3 surface 1.5 min after calcium treatment. The composition from the inner part to outer part of inclu-sions was MgO-Al2O3, CaO-MgO-Al2O3 and CaO-Al2O3 in order 4.5 min after calcium treatment. 10 min after calcium treatment, unreacted MgO-Al2O3 spinels disappeared, and simultaneously CaO-MgO-Al2O3 and CaO-Al2O3 inclusions became homogeneous in composition. The phase stability diagrams of Al2O3/MgO-Al2O3/MgO and MgO-Al2O3/xCaO·yAl2O3 were calculated using thermo-dynamic data. The result showed that it was difficult to modify MgO-Al2O3 spinels with very high aluminum content. In combination with the scanning electron microscopy images, energy-dispersive spectra and element mappings of typical inclusions, the evolution route of an inclusion was described as MgO or Al2O3→MgO-Al2O3→CaO-MgO-Al2O3→CaO-Al2O3, and the alumina content occa-sionally showed a sudden increase besides a common decrease in the middle part of the product.

Published
2015
Full Text
View/download PDF

5. A STUDY ON JERKY FLOW BEHAVIOUR OF STEELS AT LOW STRAIN RATES

Author

Zhang Yan, Cai Kai-ke, Wu Na, and Dang Zijiou

Subjects
Materials science, Strain (chemistry), Flow (psychology), Ultimate tensile strength, Metallurgy, Atmospheric temperature range, Composite material
Abstract

The tensile flow of 5140 steel has been investigated in the temperature rang 1000 to 1350 °C and at stain rates varying from 4×10 -2 /s to 10×10 - 4 /s. The types of jerky flow were A+B, B, and C observed at different conditions, and peak in peak curves emerged. The mechanism of serrated flow phenomena is dynamic recrystall ization which is mainly operating in this temperature range and at certain strain rates.

Published
1992
Full Text
View/download PDF

6. Failure mode and hot ductility of Ti-bearing steel in the brittle zone

Author

Zeng, Ya-Nan, Sun, Yan-Hui, Cai, Kai-Ke, Ma, Zhi-Fei, Xi-Ai, Zeng, Ya-Nan, Sun, Yan-Hui, Cai, Kai-Ke, Ma, Zhi-Fei, and Xi-Ai

Abstract

The hot ductility of Ti-bearing steel was studied by theoretical calculation and a thermal simulation experiment. Meanwhile, microsegregation and precipitates were analyzed. The results showed that the S, P and O elements were enriched at the grain boundaries, while the hot ductility was deteriorated by inclusions of (Fe, Mn, Si, Al)(S,O) in the interdendritic region. At a temperature of 1300 °C, large TiN particles have little effect on the hot ductility. In the temperature range from 1000 °C to 900 °C, the Reduction of Area (R.A) declined rapidly from 81.77% to 31.77%, with the size of particles decreasing from 5 to 20 nm and quantity increasing from 1.2 inds/μm2to 354 inds/μm2, respectively. In the temperature range from 900 °C to 850 °C, R.Adecreased from 31.77% to 30.12% with the ferric films gradually thickening. The critical stress, 63.58 MPa, was equal to tensile strength at 912 °C. Intergranular fracture occurred easily with higher critical stress below 912 °C.

Published
2013
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results