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Influence of Ca treatment on particle–microstructure relationship in heat-affected zone of shipbuilding steel with Zr–Ti deoxidation after high-heat-input welding
Journal of Iron and Steel Research International ( IF 3.1 ) Pub Date : 2022-05-23 , DOI: 10.1007/s42243-022-00791-7
Hong-bo Liu , Ju Kang , Xiu-juan Zhao , Cai-dong Zhang , Zhang-guo Lin , Hong-yong Yao , Zhi-qiang Tian , Zhan-li Liu , Jie Li , Chao Li

The effects of Ca treatment on the particle, microstructure, and toughness of heat-affected zone (HAZ) of shipbuilding steel with Zr–Ti deoxidation after high-heat-input welding were investigated. The simulated welding at a high-heat-input welding of 200 kJ/cm was carried out using Gleeble-3800 welding simulation. Then, particle characteristics were characterized using an Aztec-Feature automatic particle analysis system. Additionally, an in-situ observation experiment was performed to study the relationships between particle and microstructure by high-temperature confocal laser scanning microscopy (HT-CLSM). The results indicated that the average HAZ toughness at −40 °C was increased from 183 to 290 J by adding 0.0026 wt.% Ca. Meanwhile, the formation of acicular ferrite ratio was increased from 49.34% to 60.28% due to the addition of Ca. The scanning electron microscopy results clearly showed that CaO–Al2O3–TiOx–ZrO2–MnS particles could act as effective nucleation sites for the formation of acicular ferrite, which has been verified by the observation of the particle–microstructure relationship under HT-CLSM. Furthermore, particle characterization results show that the cumulative frequency of particles with the size of 1–3 μm was 33.2% in HAZ of Zr–Ti shipbuilding steel but 66.2% in HAZ of Zr–Ti–Ca shipbuilding steel.



中文翻译:

Ca处理对高线输入焊后Zr-Ti脱氧造船钢热影响区颗粒-显微组织关系的影响

研究了Ca处理对Zr-Ti脱氧造船钢高线输入焊接后热影响区(HAZ)的颗粒、组织和韧性的影响。使用 Gleeble-3800 焊接模拟进行了 200 kJ/cm 高热输入焊接的模拟​​焊接。然后,使用 Aztec-Feature 自动粒子分析系统表征粒子特性。此外,通过高温共聚焦激光扫描显微镜(HT-CLSM)进行了原位观察实验,以研究颗粒与微观结构之间的关系。结果表明,通过添加 0.0026 wt.% Ca,-40 °C 下的平均 HAZ 韧性从 183 J 增加到 290 J。同时,由于Ca的添加,针状铁素体的形成率从49.34%提高到60.28%。2 O 3 -TiO x -ZrO 2 -MnS 颗粒可以作为针状铁素体形成的有效成核位点,这一点已通过在 HT-CLSM 下观察颗粒-微观结构关系得到验证。此外,颗粒表征结果表明,尺寸为 1-3 μm 的颗粒在 Zr-Ti 造船钢 HAZ 中的累积频率为 33.2%,而在 Zr-Ti-Ca 造船钢 HAZ 中为 66.2%。

更新日期:2022-05-24
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