Abstract
A ceramic-lined composite steel pipe (CLCSP) was fabricated with N80 steel tube as substrate by self-propagating high-temperature synthesis and centrifugal casting technique. The constituent phases and microstructure of the ceramic layer were analyzed, and the mechanical properties of CLCSP were measured, including hardness, crashing strength, compression-shear strength and tensile performance. The wear and corrosion behaviors between CLCSP and N80 steel tube were also compared. The results show that ceramic layer consists of columnar dendrites of Al2O3 and spinel-like structure FeAl2O4, CLCSP has a much higher hardness, squeezing deformation resistance, wear and corrosion resistance as compared with N80 steel tube.
Highlights
The self-propagating high-temperature synthesis in a centrifugal force field (Centrifugal SHS process) is a new technology for preparation of ceramic-lined composite steel pipes [1,2,3,4]
The top microstructure consists of long columnar dendrites of Al2O3 with an average width of about 7.1μm along the radial direction of the ceramic-lined composite steel pipe (CLCSP) and spinel-like structure FeAl2O4 distributed at dendrite boundaries (Fig. 6a)
The cooling rate is rather high during the centrifugal SHS process, a great amount of gas can not emit in time from the viscous Al2O3 melt before solidification of the ceramic layer, which is why a large number of pores are observed in the top region of the ceramic layer
Summary
The self-propagating high-temperature synthesis in a centrifugal force field (Centrifugal SHS process) is a new technology for preparation of ceramic-lined composite steel pipes [1,2,3,4]. A ceramic-lined composite steel pipe is produced with an Al2O3 ceramic layer and an intermediate Fe-rich layer on the inner surface of steel pipe This type of CLCSP has pronounced advantages, such as long life cycle, light weight, low cost, and high resistance to abrasion, corrosion, erosion, and heat, as compared with other surface techniques such as nitriding, electroless Ni-P coatings, boriding and hard Cr coatings [5,6,7,8]. In the present study, centrifugal-SHS ceramic-lined composite N80 steel tube was produced using thermit mixture of Fe2O3+Al, the microstructure and mechanical properties such as hardness, crushing strength and compression-shear strength was investigated. Upon the completion of the thermit reaction, the centrifuge apparatus was allowed to run for 10 more min until the prepared CLCSP cooled down
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