Next Article in Journal
Modeling and Simulation of the Static Recrystallization of 5754 Aluminium Alloy by Cellular Automaton
Next Article in Special Issue
Formation Analysis of Edge Cracks of 33MnCrTiB Fork Steel
Previous Article in Journal
Microstructure and Texture Inhomogeneity after Large Non-Monotonic Simple Shear Strains: Achievements of Tensile Properties
Previous Article in Special Issue
Surface Characterization and Secondary Electron Emission Properties of Alumina Containing MgO Film on Ag-Mg-Al Alloy
Article

Research on Influential Mechanism of HAZ Impact Toughness for Shipbuilding Steel with Mg Addition

College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, China
*
Author to whom correspondence should be addressed.
Metals 2018, 8(8), 584; https://doi.org/10.3390/met8080584
Received: 30 June 2018 / Revised: 24 July 2018 / Accepted: 24 July 2018 / Published: 26 July 2018
(This article belongs to the Special Issue 5th UK-China Steel Research Forum)
The welding performance of shipbuilding steel under large heat input could be improved greatly by the addition of Mg to the steel, but the impact toughness of the heat affect zone (HAZ) is not stable. According to the three different thickness steel plates obtained in the industrial experiment, the large heat input welding was carried out by different heat input, and the impact toughness analysis, impact fracture analysis, metallographic microstructure analysis and inclusions analysis were carried out. The results showed that, the HAZ of three kinds of thickness plates induced much intragranular acicular ferrite (IAF); with Mg addition, the inclusion dimension had been reduced effectively, and the IAF-induced ability of the inclusions had also been improved. The difference of HAZ impact toughness with different welding heat input and different impact temperature is significant; considering the influence of welding heat input and metallographic microstructure on the impact toughness of HAZ, the welding heat load had a far greater effect than the metallographic microstructure on ductile–brittle transition temperature. At the same time, if the original metallographic microstructure of steel was coarse, the pinning effect of the inclusions would be reduced significantly, and the microstructure of HAZ would be coarsened and the impact toughness of HAZ would be decreased, so there is a certain matching relationship between the metallographic microstructure and the inclusion dimension. View Full-Text
Keywords: oxide metallurgy; impact toughness; metallographic structure; inclusion; ductile–brittle transition temperature oxide metallurgy; impact toughness; metallographic structure; inclusion; ductile–brittle transition temperature
Show Figures

Figure 1

MDPI and ACS Style

Li, H.-r.; Sun, L.-g.; Zhu, L.-g.; Liu, Y.-s.; Li, Y.-g. Research on Influential Mechanism of HAZ Impact Toughness for Shipbuilding Steel with Mg Addition. Metals 2018, 8, 584. https://doi.org/10.3390/met8080584

AMA Style

Li H-r, Sun L-g, Zhu L-g, Liu Y-s, Li Y-g. Research on Influential Mechanism of HAZ Impact Toughness for Shipbuilding Steel with Mg Addition. Metals. 2018; 8(8):584. https://doi.org/10.3390/met8080584

Chicago/Turabian Style

Li, Hui-rong, Li-gen Sun, Li-guang Zhu, Yun-song Liu, and Yun-gang Li. 2018. "Research on Influential Mechanism of HAZ Impact Toughness for Shipbuilding Steel with Mg Addition" Metals 8, no. 8: 584. https://doi.org/10.3390/met8080584

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop