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Microstructural Characterization and Mechanical Properties across Thickness of Ultra‐Heavy Steel Plate
Author(s) -
Zhou Tao,
Yu Hao,
Wang Shaoyang
Publication year - 2017
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.201700132
Subject(s) - materials science , martensite , tempering , austenite , toughness , lath , microstructure , metallurgy , quenching (fluorescence) , composite material , ductility (earth science) , ferrite (magnet) , heat treating , physics , creep , quantum mechanics , fluorescence
The microstructural homogeneity across thickness and the interior toughness are significant factors challenging the development of ultra‐heavy steel plate (above 200 mm) limited by the thermal transfer capacity of material and the loading capacity of mill. A complete understanding of the relationship between processing, structure, and property is essential for the optimization of alloying and heat treatment of ultra‐heavy steel plate. Hence, in the present work, the authors focus on the microstructural evolution and resultant mechanical properties across the thickness of ultra‐heavy steel plate under three potential heat treatment technologies, including quenching and tempering, double quenching and tempering, and intercritical quenching and tempering. The results show that the refined signal‐phase lath martensite microstructure after double quenching technology can improve toughness stability, while dual‐phase intercritical ferrite‐martensite microstructure resulted from intercritical quenching technology achieves excellent toughness stability and ductility, and a potential optimal combination of strength and toughness for ultra‐heavy steel plate. However, limited cooling capacity of the interior leads to the formation of massive coarse martensite/austenite constituents with high carbon concentration, which significantly deteriorate the toughness. Thus, the control or suppression of coarse martensite/austenite constituents is critical for optimization of low‐alloyed ultra‐heavy steel plate.