Abstract
EH36 offshore engineering steels with varied yttrium-based rare earth content were prepared by trials in industrial production. The effects of yttrium-based rare earth on the inclusions and cryogenic temperature impact properties of EH36 offshore engineering steel were investigated by scanning electron microscopy, automatic statistics of inclusions, thermodynamic analysis and fracture morphology analysis. Yttrium-based rare earth could refine the inclusions and modify irregular Al2O3 and MnS inclusions into small, spherical, regular rare earth inclusions. The optimal impact properties were found in EH36 steel with 0.020 wt.% yttrium-based rare earth. Compared with 0RE steel, the RE-inclusions were within 3 μm (91.95% of total inclusions) in diameter and were spherical or quasi-spherical when dispersed in 200RE steel. Meanwhile, the cryogenic temperature impact properties significantly increased: 200RE steel impact properties were increased by 245.1% at −80 °C.
Highlights
Academic Editors: Marina Polyakova, With the continuous development of marine resources, China’s shipbuilding and offshore oil industry has ushered in a new period of rapid growth, which has an increasing demand for shipbuilding steel and offshore engineering steel
A number of scholars have shown that the addition of rare earth elements to the test steel can significantly improve the mechanical properties of materials [16,17,18,19,20]
The role of yttrium-based rare earth on inclusions and cryogenic temperature impact properties of EH36 offshore engineering steel were systematically analyzed by means of scanning electron microscopy (SEM), automatic statistics of inclusions and thermodynamic analysis, with the aim to develop excellent cryogenic temperature impact toughness in offshore engineering steel and to lay the foundations for broadening the application of rare earth in high-performance offshore engineering steels
Summary
Academic Editors: Marina Polyakova, With the continuous development of marine resources, China’s shipbuilding and offshore oil industry has ushered in a new period of rapid growth, which has an increasing demand for shipbuilding steel and offshore engineering steel. Remarkable cryogenic temperature impact toughness, strength, weldability, fatigue resistance, fine corrosion resistance, large thickness and large standardization are the development direction of offshore engineering steel [3,4,5]. Many published papers have shown that the addition of alloying elements (Zr, Ti, Mg, etc.) has been effective in improving the toughness for offshore engineering steel [7,8,9]. A number of scholars have shown that the addition of rare earth elements to the test steel can significantly improve the mechanical properties of materials [16,17,18,19,20]. Rare earth elements lanthanum and cerium have a remarkable effect on inhibiting the initial marine corrosion behavior of offshore engineering steel [27,28]. The role of yttrium-based rare earth on inclusions and cryogenic temperature impact properties of EH36 offshore engineering steel were systematically analyzed by means of scanning electron microscopy (SEM), automatic statistics of inclusions and thermodynamic analysis, with the aim to develop excellent cryogenic temperature impact toughness in offshore engineering steel and to lay the foundations for broadening the application of rare earth in high-performance offshore engineering steels
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