Microstructure and property of flash welded joint of FeCrAl alloy tube
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摘要: 采用闪光焊对FeCrAl合金进行对接接头焊接，通过扫描电子显微镜及能谱仪等手段研究了焊接接头的显微组织特征、不同区域氧化物颗粒的分布情况及力学性能. 结果表明，闪光焊焊接FeCrAl合金所得焊接接头显微组织主要为等轴晶，在焊缝和热影响区氧化物未出现明显聚集及向晶界偏聚的现象，且在晶内和晶界都可以呈现弥散分布的特征；焊接接头抗拉强度值达到594 MPa，为母材强度的90.5%；接头断裂在焊缝区，整体呈现脆性断裂模式；焊缝晶粒的粗化导致焊缝区硬度降低，最终引起焊接接头出现软化.Abstract: The butt joints of FeCrAl alloy were welded by flash light welding. The microstructure, distribution of oxide particles and mechanical properties of the welded joints were investigated by scanning electron microscope and energy dispersive spectrometer. The results show that: the microstructure of FeCrAl alloy welded by flash light welding is mainly equiaxed grain. No obvious oxides are aggregated and segregated in the grain boundary of weld metal and heat-affected zone. Most oxides are dispersed in the grain and grain boundary. The tensile strength of the welded joint reaches 594 MPa, which is 90.5% of the strength of the base metal. The joint is fractured in the weld zone and presents the brittle fracture mode as a whole. The grain coarsening of the weld metal makes the hardness decrease, which leads to the softening of the welded joint.
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Keywords:
- FeCrAl alloy /
- flash light welding /
- nanoscale oxide particles /
- tensile properties
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图 2 母材组织及晶界析出相
Figure 2. Microstructure of base metal and precipitated phase at grain boundary. (a) microstructure of the base metal; (b) distribution of oxides in the base metal; (c) distribution of oxides in the base metal grain boundary; (d) types of oxides and grain boundary precipitate in the base metal
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图 4 焊缝金属和热影响区的微观组织
Figure 4. Microstructure of weld metal and heat affected zone. (a) microstructure of the weld metal; (b) microstructure of the upper heat affected zone; (c) microstructure of the middle heat affected zone
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图 5 母材、焊缝及热影响区的晶粒尺寸
Figure 5. Grain sizes of base metal, weld metal and heat affected zone
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图 6 焊缝及热影响区氧化物的分布
Figure 6. Distribution of oxides in weld metal and heat affected zone. (a) weld metal; (b) upper heat-affected zone; (c) middle heat-affected zone
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图 8 焊接接头拉伸断裂位置及断口侧面
Figure 8. Tensile fracture location and fracture side surface of the welded joint. (a) tensile fracture location; (b) fracture side surface
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图 9 焊接接头的拉伸断口
Figure 9. Tensile fracture surface of the welded joint. (a) cleavage fracture surface; (b) crack initiation origin; (c) magnification of crack initiation origin
表 1 FeCrAl合金管材的主要化学成分(质量分数, %)
Table 1 Main chemical compositions of FeCrAl alloy tube base material
C Si Cr Al Ni Y Hf Ti Zr Fe 0.028 0.29 20 ~ 23 4 ~ 5 0.11 0.16 0.06 0.009 0.06 余量 
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表 2 闪光焊FeCrAl合金管材的焊接工艺参数
Table 2 Welding parameters of FeCrAl alloy tube by flash welding
焊接电流
I/A顶锻留量
Su/mm闪光时间
t/s顶锻时间
t0/s550 15 10 7
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表 3 图2d中氧化物颗粒的化学成分(质量分数, %)
Table 3 Chemical compositions of oxide particles in Fig. 2d
位置 Fe Cr Al Hf Zr 1 44 16.7 3.5 13.5 8.7 2 66.1 22.2 5.1 0 0.7 3 44.0 40.3 3.4 0.5 0.3 4 63.2 23.0 5.8 0 0 位置 Y Ti O 可能氧化物及
析出相类型1 1.1 0.8 1.1 Y-M-O 2 0.5 0.1 2.5 Y2O3 3 0.2 0 3.9 富Cr析出相 4 0 0.1 2.3 —
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