Microstructure, mechanical properties and corrosion resistance of the Ni-based alloy NS1402 TIG welded joints
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摘要: 采用TIG焊接方式，以镍基焊丝ERNiFeCr-1作为填充材料对国产镍基合金NS1402进行焊接性研究，并与国外Incoloy825合金进行对比，分析其接头的显微组织和力学性能。同时对比了普通低合金钢焊丝ER50-6对国内外两种合金的焊接性的影响，并研究其接头的耐腐蚀性能。结果表明，镍基合金NS1402接头成型良好，焊缝区组织由大片等轴晶和少量柱状晶组成；拉伸试样从NS1402焊缝处断裂，焊缝接头抗拉强度达到570 MPa，达到母材抗拉强度的89.1%，NS1402的强度及延伸率均略低于进口825合金；对接头拉伸后的断口形貌进行观察和分析，发现镍基合金NS1402焊接接头断口类型为延性断裂，接头断口韧窝的尺寸较小、数量偏多；镍基焊丝ERNiFeCr-1接头的耐腐蚀性能优于普通ER50-6焊丝接头，腐蚀试验结果表明，国产镍基合金NS1402接头耐腐蚀性能与国外Incoloy825接头相当。
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关键词:
- 镍基合金NS1402 /
- TIG焊接 /
- 力学性能 /
- 耐蚀性能
Abstract: The weldability of domestic nickel-based alloy NS1402 by TIG welding with nickel-based wire ERNiFeCr-1 as the filler material was studied. The microstructures and mechanical properties of the joints were analyzed compared with the foreign Incoloy825 alloy. At the same time, the effect of common low alloy steel wire ER50-6 on the weldability of the two alloys at home and abroad was compared, and the corrosion resistance of the joints was investigated. The results show that the nickel-based alloy NS1402 joints are well formed, and the weld zone consists of a large area of equiaxial crystals and a small number of columnar crystals. Tensile specimens are broken at the NS1402 welding seam, and the welded joints have a tensile strength of 570 MPa, which is 89.1% of the tensile strength of base metal. The strength and elongation of NS1402 are slightly lower than that of the imported 825 alloy. The fracture morphology of the joints after tensile testing is observed and analyzed. It is found that the fracture morphology of nickel-based alloy NS1402 welded joint exhibits ductile fracture, with a higher number of small-sized dimples on the fracture joints. The corrosion resistance of nickel-based wire ERNiFeCr-1 joint is better than the common ER50-6 wire joints. The corrosion test results show that the corrosion resistance of the domestic nickel-based alloy NS1402 joints and foreign Incoloy825 joints is comparable.-
Key words:
- nickel-based alloy NS1402 /
- TIG welding /
- mechanical property /
- corrosion resistance
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图 3 NS1402焊缝底部截面微观组织
（a）焊缝底部左侧；（b）焊缝底部中心；（c）焊缝底部右侧
Figure 3. Microstructures of the bottom section of NS1402 weld seam
图 4 NS1402焊缝中心截面微观组织
（a）焊缝中心上部；（b）焊缝中心中部；（c）焊缝中心底部
Figure 4. Microstructures of the central section of NS1402 weld seams
图 5 NS1402焊缝熔合线截面微观组织
（a）焊缝熔合线上部；（b）焊缝熔合线中部；（c）焊缝熔合线底部
Figure 5. Microstructures of the cross section of NS1402 weld seams fusion line
图 6 Incoloy825焊缝底部截面微观组织
（a）焊缝底部左侧；（b）焊缝底部中心；（c）焊缝底部右侧
Figure 6. Microstructures of the bottom section of Incoloy 825 weld seams
图 7 Incoloy825焊缝中心截面微观组织
（a）焊缝中心上部；（b）焊缝中心中部；（c）焊缝中心底部
Figure 7. Microstructures of the center section of Incoloy825 weld seams
图 8 Incoloy825焊缝熔合线截面微观组织
（a）焊缝熔合线上部；（b）焊缝熔合线中部；（c）焊缝熔合线底部
Figure 8. Microstructures of the cross section of Incoloy825 weld seam fusion line
图 9 焊接件拉伸试样选区示意
Figure 9. Schematic diagram of the selecting areas for tensile specimens of welded parts
图 10 焊接件拉伸试样
（a）NS1402焊接拉伸试样；（b）Incoloy825焊接拉伸试样；（c）NS1402拉断后试样；（d）Incoloy825拉断后试样
Figure 10. Tensile specimens of welded parts
图 12 接头断口形貌
Figure 12. Fractography of the joint
镍基合金NS1402焊接接头:（a）×200；（b）×500；（c）×1500；镍基合金Incoloy825焊接接头：（d）×200；（e）×500；（f）×1500
图 14 接头宏观腐蚀形貌
（a）ER50-6焊丝NS1402接头；（b）ER50-6焊丝Incoloy825接头；（c）ERNiFeCr-1焊丝NS1402接头；（d）ERNiFeCr-1焊丝Incoloy825接头
Figure 14. Macroscopic corrosion profiles of joints
图 15 焊缝晶界腐蚀形貌
（a）ER50-6焊丝NS1402接头；（b）ER50-6焊丝Incoloy825接头； （c）ERNiFeCr-1焊丝NS1402接头；（d）ERNiFeCr-1焊丝Incoloy825接头
Figure 15. Morphology of grain boundary corrosion in weld seams
表 1 母材及焊丝化学成分
Table 1. Chemical compositions of the base material and welding wires
% 材料 C Cr Fe Mn Ni Mo Al P S NS1402 0.05 19.5~23.5 余量 1.0 38~46 2.5~3.5 0.2 0.03 0.03 Incoloy825 0.05 19.5~23.5 余量 1.0 38~46 2.5~3.5 0.2 0.03 0.03 ERNiFeCr-1 0.03 20.89 31.16 0.53 40.01 3.23 0.14 0.02 0.01 
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表 2 接头晶间腐蚀结果
Table 2. Results of intergranular corrosion of joints
焊丝 母材 腐蚀前/g 腐蚀后/g 差值/g 腐蚀率/% ER50-6 NS1402
Incoloy82513.344
13.47212.288
12.6471.056
0.8257.91
6.12ERNiFeCr-1 NS1402
Incoloy82544.906
43.00744.902
43.0020.004
0.0050.0089 0.0116
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