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| Effect of welding process on microstructure and properties of heat affected zone of marine steel |
| ZHU Li-guang1,2,3, MA Chen-yu1,2, WANG Qi1,2, ZHENG Ya-xu1,2, XIAO Peng-cheng3, GUO Zhi-hong1,2 |
1. School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, Hebei, China;
2. Hebei Key Laboratory of Hebei Materials Near-net Forming Technology, Shijiazhuang 050018, Hebei, China;
3. College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, Hebei, China |
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Abstract The third generation oxide metallurgy technology with Mg treatment is adopted to produce 70 mm thick EH420 marine steel through hot metal pretreatment→converter→LF refining→VD refining→CC→TMCP process. In order to study the effect of "welding pass" and "line energy" on the microstructure and properties of heat affected zone (HAZ),thick plates were welded with large line energy. The welding processes were three wire submerged arc two pass welding with 170 kJ/cm line energy and three wire submerged arc single pass welding with 250 kJ/cm line energy. The results show that compared with the upper surface of 170 kJ/cm,the original austenite grain size at 170 kJ/cm T/4 increases from 58.60 μm to 75.22 μm due to "two pass welding". The number of M-A components is close,but the average size of island M-A components increases from 0.96 μm to 1.26 μm,and the average size of strip M-A components increases from 1.89 μm to 2.44 μm. The impact toughness at low temperature is deteriorated,and the average impact energy at -40 ℃ is reduced from 205 J to 156 J. Compared with the 170 kJ/cm upper surface,the original austenite grain size on the 250 kJ/cm upper surface increased from 58.60 μm to 74.75 μm due to the "increase of linear energy". The number of M-A components decreased,but the size of M-A components increased significantly. The average size of island M-A components increased from 0.96 μm to 1.52 μm,and the average size of strip M-A components increased from 1.89 μm to 2.87 μm,which worsened the low-temperature impact toughness,and the average impact energy at -40 ℃ decreased from 205 J to 187 J. After high line energy welding,there are composite inclusions in the coarse-grained region with MgO as the core and Ti(N,C) attached to the periphery. These inclusions can induce the precipitation of acicular ferrite (IAF),which is helpful to improve the impact toughness. Compared with 170 kJ/cm T/4,the size of M-A components on the upper surface of 250 kJ/cm is similar,but the number remains low,so the impact toughness on the upper surface of 250 kJ/cm is higher. Compared with multi pass welding,appropriately increasing the linear energy and reducing the welding passes can not only improve the impact toughness,but also improve the welding efficiency.
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Received: 25 July 2022
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2023, Vol. 58 
