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Metals 2018, 8(8), 628; https://doi.org/10.3390/met8080628

Thickness Dependence of Toughness in Ultra-Heavy Low-Alloyed Steel Plate after Quenching and Tempering

1,2
,
1,2
and
1,*
1
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2
Baosteel Research Institute, Shanghai 201900, China
*
Author to whom correspondence should be addressed.
Received: 4 July 2018 / Revised: 3 August 2018 / Accepted: 3 August 2018 / Published: 10 August 2018
(This article belongs to the Special Issue 5th UK-China Steel Research Forum)
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Abstract

Due to the limitations of manufacturing techniques, inhomogeneous microstructures and properties along the thickness direction have been a big challenge for heavy and ultra-heavy plates of quenched and tempered low-alloyed steel. In this study, variation in microstructures and mechanical properties were investigated from the surface to the center of a 130 mm-thick ultra-heavy steel plate. Emphasis was made on toughness performance including impact toughness and crack resisting ability. It was found that the ultimate tensile strength at the plate surface, quarter and center thickness at room temperature are 715, 643 and 618 MPa, respectively. Meanwhile, the ductile-brittle transition temperature defined by fracture appearance for these three plate positions are −100, −30 and −15 °C, respectively. Moreover, the crack resisting ability represented by the nil-ductility temperature are −40, −25 and −10 °C for these three positions respectively. Investigation by field emission scanning electron microscopy (FE-SEM) and electron backscatter diffraction (EBSD) revealed that the plate surface features finer matrix grain and carbide precipitation, as well as greater frequency of high angle misorientation. These microstructural features contribute to enhancing deformability, retarding cleavage initiation and hindering crack propagation, leading to the pronounced increase in the energy for fracture propagation and the overall impact energy as compared to the other two plate positions. View Full-Text
Keywords: ultra-heavy steel plate; toughness; instrumented impact; fracture propagation; electron backscatter diffraction ultra-heavy steel plate; toughness; instrumented impact; fracture propagation; electron backscatter diffraction
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Liu, H.; Zhang, H.; Li, J. Thickness Dependence of Toughness in Ultra-Heavy Low-Alloyed Steel Plate after Quenching and Tempering. Metals 2018, 8, 628.

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