Influence of Ca treatment on particle-microstructure relationship in heat-affected zone of shipbuilding steel with Zr-Ti deoxidation after high-heat-input welding  

作　　者：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 

机构地区：[1]Technology Research Institute,HBIS Group,Shijiazhuang 050023,Hebei,China [2]Beijing Key Laboratory of Pipeline Critical Technology and Equipment for Deepwater Oil and Gas Development,Beijing Institute of Petrochemical Technology,Beijing 102617,China [3]Department of Material Engineering,Hebei Vocational University of Industry and Technology,Shijiazhuang 050091,Hebei,China [4]HBIS Company Limited,Shijiazhuang 050023,Hebei,China [5]School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China [6]HBIS Group Shisteel Company,Shijiazhuang 050031,Hebei,China

出　　处：《Journal of Iron and Steel Research International》2022年第8期1291-1298,共8页

基　　金：supported by the Open Project Program of Bejing Key Laboratory of Pipeline Critical Technology and Equipment forDeepwater Oil&Gas Development(Grant No.BIPT2019001);the Natural Science Foundation of Hebei Province(Grant No.E2021318004)。

摘　　要：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 ℃ 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-Al_(2)O_(3)-TiOx-ZrO_(2)-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 lm was 33.2% in HAZ of Zr-Ti shipbuilding steel but 66.2% in HAZ of Zr-Ti-Ca shipbuilding steel.

关 键 词：Shipbuilding steel Heat-affected zone Impact toughness MICROSTRUCTURE Particle characterization 

分 类 号：TG142[一般工业技术—材料科学与工程]