Microstructure, mechanical properties and corrosion resistance of the Ni-based alloy NS1402 TIG welded joints
-
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。
-
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
-
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 
下载: 导出CSV
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
下载: 导出CSV
-
[1] Zhang Shulang, Zhang Hongbin. Incoloy825 corrosion resistant alloy[J]. Special Steel Technology, 2005,10(3):64-66. (张菽浪, 张红斌. Incoloy 825耐蚀合金[J]. 特钢技术, 2005,10(3):64-66.Zhang Shulang, Zhang Hongbin. Incoloy825 corrosion resistant alloy[J]. Special Steel Technology, 2005, 10（3）: 64-66. [2] Yao Caiyan, Zhang Linxian. Research on welding process of incoloy alloy 825 iron-nickel-based alloy[J]. Welding Technology, 2002,31(6):19-20. (姚彩艳, 张林贤. Incoloy Alloy 825铁镍基合金的焊接工艺研究[J]. 焊接技术, 2002,31(6):19-20. doi: 10.3969/j.issn.1002-025X.2002.06.009Yao Caiyan, Zhang Linxian. Research on welding process of incoloy alloy 825 iron-nickel-based alloy[J]. Welding Technology, 2002, 31（6）: 19-20. doi: 10.3969/j.issn.1002-025X.2002.06.009 [3] Xiong Yong, Cheng Fasong, Li Yongbin, et al. Failure analysis of a GH4033 nickel-based alloy bond ring of an aero-engine[J]. Mechanical Engineering Materials, 2019,43(9):78-82. (熊勇, 程法嵩, 李永斌, 等. 某航空发动机GH4033镍基合金结合环的失效分析[J]. 机械工程材料, 2019,43(9):78-82. doi: 10.11973/jxgccl201909015Xiong Yong, Cheng Fasong, Li Yongbin, et al. Failure analysis of a GH4033 nickel-based alloy bond ring of an aero-engine[J]. Mechanical Engineering Materials, 2019, 43（9）: 78-82. doi: 10.11973/jxgccl201909015 [4] Kim P S, Choi S Y, Kim Y S, et al. A study on the weldability of Incoloy 825 alloys and STS316L alloys[J]. Advanced Materials Research, 2015,1110:118-124. doi: 10.4028/www.scientific.net/AMR.1110.118 [5] Nagaraj B, Ramana V V. Empirical modelling and investigations of process parameters on a super alloy[J]. Materials Today : Proceedings, 2019, 19: 213-217. [6] Wang Tao, Zheng Zhentai, Dong Tianshun, et al. Effect of pulsed TIG welding process parameters on the grain size of Inconel601H nickel-based alloy welds[J]. Journal of Welding, 2015,36(4):109-112. (王涛, 郑振太, 董天顺, 等. 脉冲TIG焊接工艺参数对Inconel601H镍基合金焊缝晶粒大小的影响[J]. 焊接学报, 2015,36(4):109-112.Wang Tao, Zheng Zhentai, Dong Tianshun, et al. Effect of pulsed TIG welding process parameters on the grain size of Inconel601H nickel-based alloy welds[J]. Journal of Welding, 2015, 36（4）: 109-112. [7] Hu Xianjun, Hong Huimin, Zhang Ke, et al. Microstructure and properties of Incoloy 825 alloy after solid solution at different temperatures[J]. Mechanical Engineering Materials, 2017,41(8):23-26. (胡显军, 洪慧敏, 张珂, 等. 不同温度固溶后Incoloy825合金的显微组织与性能[J]. 机械工程材料, 2017,41(8):23-26. doi: 10.11973/jxgccl201708005Hu Xianjun, Hong Huimin, Zhang Ke, et al. Microstructure and properties of Incoloy 825 alloy after solid solution at different temperatures[J]. Mechanical Engineering Materials, 2017, 41（8）: 23-26. doi: 10.11973/jxgccl201708005 [8] Al-Saadi M, Sandberg F, Kasarav A, et al. Microstructure characterisation in alloy 825[J]. Procedia Manufacturing, 2018,15:1626-1634. doi: 10.1016/j.promfg.2018.07.294 [9] Sayyar N, Shamanian M, Niroumand B, et al. EBSD observations of microstructural features and mechanical assessment of Incoloy 825 alloy/AISI 321 stainless steel dissimilar welds[J]. Journal of Manufacturing Processes, 2020,60:86-95. doi: 10.1016/j.jmapro.2020.10.042 [10] Lang Yuping, Zhang Guoxin, Fang Yi, et al. Heat distortion behavior, mechanical and intergranular corrosion properties of NS1402 alloy[J]. Special Steel Technology, 2013, 19(1): 11-15. (郎宇平, 张国信, 方轶, 等. NS1402合金的热变形行为、力学和晶间腐蚀性能[J] 特钢技术, 2013, 19(1): 11-15.Lang Yuping, Zhang Guoxin, Fang Yi, et al. Heat distortion behavior, mechanical and intergranular corrosion properties of NS1402 alloy[J]. Special Steel Technology, 2013, 19(1): 11-15. -
计量
- 文章访问数: 193
- HTML全文浏览量: 80
- PDF下载量: 18
- 被引次数: 0
