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| 焊接热输入对不同Nb含量AH36钢粗晶热影响区组织和力学性能的影响 |
| Effect of Welding Heat Input on Microstructure and Mechanical Properties of Coarse-grained Heat Affected Zone in AH36 Steel Containing Different Nb Contents |
| Received:May 10, 2024 |
| DOI：10.3969/j.issn.1674-6457.2025.01.016 |
| 中文关键词: Nb微合金化 粗晶热影响区 冲击韧性 针状铁素体 气电立焊 |
| 英文关键词: Nb microalloying coarse-grained heat affected zone impact toughness acicular ferrite electrogas welding |
| 基金项目:江苏省科技成果转化专项资金项目(BA2021040) |
| Author Name | Affiliation | | PAN Nan | Institute of Research of Iron and Steel, Shagang, Jiangsu Zhangjiagang 215625, China | | WANG Na | Institute of Research of Iron and Steel, Shagang, Jiangsu Zhangjiagang 215625, China | | ZHAO Fu | Institute of Research of Iron and Steel, Shagang, Jiangsu Zhangjiagang 215625, China | | ZHANG Yu | Institute of Research of Iron and Steel, Shagang, Jiangsu Zhangjiagang 215625, China |
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| 中文摘要: |
| 目的 研究大热输入条件下不同Nb含量AH36钢的焊接性能。方法 使用光学显微镜、场发射扫描电镜、透射电镜、维氏硬度仪和冲击试验机，研究了热输入对不同Nb含量AH36钢粗晶热影响区(CGHAZ)微观组织、维氏硬度和常温冲击韧性的影响。采用气电立焊试验评价了工业试制的AH36钢板的焊接性能。结果 随着热输入的增大，原奥氏体晶粒尺寸逐渐增大，侧板条铁素体含量与贝氏体含量逐渐下降，晶界铁素体不断粗化，硬度呈现下降趋势。当热输入为140 kJ/cm时，CGHAZ的常温冲击功高于热输入80 kJ/cm时的常温冲击功，但相近于热输入200 kJ/cm时的常温冲击功。在同等热输入下低Nb钢CGHAZ的贝氏体含量小于高Nb钢的。因此，低Nb钢CGHAZ的硬度低于高Nb钢硬度，常温冲击韧性优于高Nb钢的。气电立焊接头各区域的冲击功均满足船级社要求。结论 低Nb含量AH36钢的焊接性能优于高Nb含量AH36钢的。工业试制的AH36钢板具有良好的焊接性能。 |
| 英文摘要: |
| The work aims to investigate the weldability of AH36 steel containing different Nb contents under high heat input conditions. The effect of heat input on microstructure, hardness and impact toughness at room temperature of coarse-grained heat affected zone (CGHAZ) in AH36 steel with different Nb contents was investigated by optical microscopy, field emission scanning electron microscopy, transmission electron microscopy, vickers hardness tester and impact tester. The electrogas welding experiment was used to evaluate the weldability of AH36 steel plate produced industrially. With the increase of heat input, the prior austenite grain size increased, the content of ferrite side plate and bainite decreased, the grain boundary ferrite coarsened and the hardness tended to drop. The impact energy at room temperature of CGHAZ with heat input of 140 kJ/cm was higher than that of heat input of 80 kJ/cm, but close to that of 200 kJ/cm heat input. Under the same level of heat input, the bainite content of CGHAZ in steel with low Nb content was lower than that with high Nb content. Therefore, the hardness and impact toughness at room temperature of CGHAZ in steel with low Nb content were lower and better than that with high Nb content, respectively. The impact energy of each zone of welded joint produced by electrogas welding satisfied the requirements of classification society. The weldability of AH36 steel with low Nb content is higher than that with high Nb content. The AH36 steel plate produced industrially has good weldability. |
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