Microstructure and Properties of 10 mm Thick C-276 Alloy Plates by K-TIG Welding
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摘要: 采用Keyhole TIG(K-TIG)焊接工艺对10 mm厚C-276哈氏合金进行单面焊双面成形。焊缝截面无气孔、未熔合、裂纹等缺陷;焊缝区组织主要为细长的柱状晶,并伴随少量的析出物。采用ASTM G28A法进行晶间腐蚀试验,焊缝的平均腐蚀速率为4.418 mm/a,耐晶间腐蚀性能良好。接头的平均抗拉强度为735.5 MPa,断裂位置在母材处;拉伸断口分布大量的细密等轴韧窝,为典型的韧性断裂,接头韧性优良;在α=180°、d=4t的条件下进行侧弯试验,未发现裂纹产生。母材、热影响区及焊缝的硬度值差别不大,接头硬度的一致性良好。Abstract: The keyhole TIG (K-TIG) welding process is adopted to realize the single side welding and double side forming of 10 mm thick C-276 alloy plate. The weld cross section has no defects such as porosity, incomplete fusion and crack. The structure of the weld zone is mainly elongated columnar crystal and equiaxed crystal, and a small amount of precipitates are distributed at the grain boundary. The intergranular corrosion test is carried out by ASTM G28A method. The results show that the average corrosion rate of the weld is 4.418 mm/a, and its intergranular corrosion resistance of the weld is good. The average tensile strength of the joint is 735.5 MPa, and the fracture position is in the base metal. A large number of the fine equiaxial dimples are distributed on the tensile fracture surface, which is typical ductile fracture, and the joint has good toughness. No cracks are found by side bending test. The hardness values of the base metal, heat affected zone and weld seam of the joint have little difference, and the hardness of the joint is in good consistence.
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Key words:
- C-276 alloy /
- K-TIG welding /
- microstructure /
- intergranular corrosion /
- mechanical property /
- hardnes
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