Experimental Study on Hot Crack in Fishbone Welding of a New Type Ni-Fe Based Superalloy

doi:10.3901/JME.260563

Abstract

Abstract: The hot crack sensitivity of a new type of the Ni-Fe based super alloy was tested by using a fishbone welding hot crack test method, and the microstructure and elemental composition of the hot crack tip were analysed, as well as the morphology and fracture morphology of the hot crack were characterized. The results show that the hot crack of the new Ni-Fe based super alloy belongs to the crystalline type hot crack, and the hot crack tendency is more sensitive to the welding heat input. In the case of ensuring the forming quality of the welding joint, the small welding heat input can effectively restrain the hot crack. For unfilled wire welding, when the energy of the welding line is large, the hot crack expands along the boundary of the intersection of the columnar dendrites on both sides, but with the decrease of the energy of the welding line, the central structure of the weld changes from columnar dendrites to equiaxial dendrites, and the crystal crack expands along the zigzag grain boundary of the equiaxial dendrites. Due to the obvious dendrite segregation in the weld structure, a residual liquid film with low melting point rich in P, Si, B and Ti elements is formed near the grain boundary at the end of crystallization, and under the action of welding tensile stress, the liquid film tears and cracks occur. In the process of wire filling welding, the dendrite segregation phenomenon of weld seam is more serious. When the welding line energy is large, the cylindrical dendrite in the center of weld is relatively developed, and the crystal crack mainly expands along the dendrite intersection boundary on both sides of the weld. With the decrease of the line energy, the weld center is mainly equiaxed dendrite, and the crystal crack changes from spreading along the grain to spreading along the interarm dendrite. At the end of solidification of weld pool, eutectic liquid film with low melting point will be formed between dendrite arms. Under the action of welding tensile stress, the liquid film will tear and form crystal crack.

Key words: welding hot crack, welding wire energy, thermal crack sensitivity, Ni-Fe based super alloy

CLC Number:

TG156

BAI Jiayu, WANG Zhiying, ZHU Bo, YU Zaisong, ZHANG Min, ZHANG Jianxun. Experimental Study on Hot Crack in Fishbone Welding of a New Type Ni-Fe Based Superalloy[J]. Journal of Mechanical Engineering, 2026, 62(12): 231-240.

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