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Microstructure of Nb‐Bearing Pipeline Steel with Improved Property Applying Ultrafast Cooling Process
Author(s) -
Yao ShengJie,
Du LinXiu,
Wang GuoDong
Publication year - 2014
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201200125
Subject(s) - materials science , pearlite , microstructure , ferrite (magnet) , metallurgy , ductility (earth science) , ultrashort pulse , dislocation , composite material , austenite , optics , creep , laser , physics
X70 pipe line steel with high mechanical strength and high ductility can be achieved through hot rolling and ultrafast cooling process at a low cost. A large amount of nano‐sized precipitates and dislocations are identified near the surface layer of the steel applying ultrafast cooling, which contribute immeasurably to the improvement of mechanical properties. In addition, high cooling rate decreases the mean distance of pearlite laminae, and massive ferrite grains characterized by curved grain boundaries and high dislocation density are also transformed as one of the typical microstructures in the samples applying ultrafast cooling process.