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板式换热器用 TIG 焊接 Zr-3 板材的组织演变、力学性能及醋酸中的腐蚀性能
Microstructure Evolution, Mechanical Properties, and Corrosion Performance inAcetic Acid of TIG-welded Zr-3 Plates for Plate Heat Exchangers
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- DOI:
- 作者:
- 王子贺 1，程 军 2，赵院婷 3，刘中亚 3，王泽鑫 1，贺一轩 2，陈靓瑜 1，芦 笙 1
WANG Zihe1, CHENG Jun2, ZHAO Yuanting3, LIU Zhongya3, WANG Zexin1,HE Yixuan2, CHEN Liangyu1, LU Shen
- 作者单位:
- 1. 江苏科技大学 材料科学与工程学院，江苏 镇江 212100；2. 西北工业大学 凝固技术全国重点实验室，陕西 西安710072；3. 江苏索普赛瑞装备制造有限公司，江苏 镇江 212002
1. School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, China;2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China; 3. JiangsuSupursery Equipment Manufacturing Co., Ltd., Zhenjiang 212002, China
- 关键词:
- Zr-3 板材；TIG 焊接；组织演变；力学性能；醋酸腐蚀；魏氏组织；电化学行为
Zr-3 plate; tungsten inert gas welding; microstructure evolution; mechanical properties; acetic acid corrosion;Widmanst?tten structure; electrochemical behavior
- 摘要:
- 为了推动国产 Zr-3 板材在醋酸板式换热器中的工程应用，针对极气体氩弧焊(tungsten inert gas welding,TIG)焊接接头的组织、力学性能及腐蚀性能关联性开展了系统研究。 通过光学显微镜(OM)和电子背散射衍射分析(EBSD)观察到，母材(base metal, BM)主要为 α-Zr 等轴晶，平均晶粒尺寸为 3.5 μm；焊缝(weld zone, WZ)则为 α-Zr 板条状魏氏体组织，晶粒尺寸为 5.1 μm，焊缝晶粒取向差(kernel average misorientation, KAM)为 0.37°低于母材的 0.51°。 室温拉伸及显微硬度测试结果表明，Zr-3 锆合金 TIG 焊接接头的抗拉强度较母材降低 2.2%，伸长率出现显著下降，降幅约 53.8%，而接头的显微硬度略高于母材。 电化学测试中发现，在不同浓度醋酸中，焊缝的腐蚀电流密度略高于母材，表明焊缝的腐蚀倾向稍高，但所有试样的腐蚀速率均满足工业要求。研究证明，TIG 焊接的 Zr-3 板材在醋酸工况下具有优良的综合性能。To promote the engineering application of domestic Zr-3 plates in acetic acid-based plate heat exchangers, asystematic study was conducted to investigate the correlation between the microstructural evolution law, mechanicalproperties, and acetic acid corrosion behavior of tungsten inert gas (TIG) welded joints. Microstructure characterization ofthe welded joints was performed using optical microscopy (OM) and electron backscatter diffraction (EBSD) techniques,and the results reveal that the base metal (BM) is composed primarily of uniformly fine equiaxed α-Zr grains with anaverage grain size of 3.5 μm. In contrast, the weld zone (WZ) has a lath-like Widmanstätten structure of α-Zr, with a grainsize of 5.1 μm. Moreover, the kernel average misorientation (KAM) value of the weld joint is 0.37°, which is lower thanthat of the base metal (0.51°). Room-temperature tensile and microhardness tests demonstrate that the tensile strength ofZr-3 zirconium alloy TIG-welded joints decreases by 2.2% relative to that of the base metal, whereas the elongation significantly decreases by approximately 53.8%. Moreover, the microhardness of the welded joints is slightly greater thanthat of the base metal. The corrosion behavior of the welded joints in acetic acid solutions was studied via potentiodynamicpolarization curves and electrochemical impedance spectroscopy. The results demonstrate that across different acetic acidconcentrations, the corrosion current density of the WZ is slightly higher than that of the BM, indicating a marginallygreater corrosion tendency of the WZ; nevertheless, all the samples meet the industrial corrosion requirements for plate heatexchangers under acetic acid service conditions. This study confirms that TIG-welded Zr-3 plate joints exhibit excellentcomprehensive mechanical properties and acetic acid corrosion resistance.