Study On The Correlation Between Inconel601H Nickel-Based Alloy Microstructures And Welding Procedure

In this paper, the effects of welding parameters on the microstructures of Inconel601H Nickel-based super alloy were studied. In addition, the after heat treatment process of the workpiece after welded was explored simply. Firstly, Inconel601H workpiece were welded by Pulse-TIG welding with different process parameters; Secondly, the microstructures was examed by SEM and XRD et al; Thirdly, the welding parameters optimized; Finally, the evolution of the microstructure after hear treatment was studied.The main conclusions were shown as following: (1)The optimized welding parameters are: average current 228A, welding speed 200mm/min, base value of current 59A, peak current 300A, occupies empties 70%. (2)The microstructures of base metal are single-phase austenitic half-curled crystal, and the weld joint were mainly composed of strip austenitic and cellular branch crystal grains. Precipitation phase are mainly Ni₃(Al,Ti), Cr₂₃C₆ and TiC. For the welds, the content of these IMCS are more than that in the base metal. Same of the IMCS were concentrated near the cellular branch crystal in the welds. If the Welding line energy increased, the content of depositions will be increased. (3)Solution temperature had more influence on grain changes than solid solution time. After heat treatment, in the base of grains grew up more obviously. Weld within the cellular branch crystal grain boundary disappear, weld grain shorter coarsens, and overall uniformity degree tall. Moreover, in the base of precipitation phase quantity reduced gradually with the rise of solid solution temperature. When you get to the 1180℃, separation material basic back to dissolve finished, apart from big volume. The results of weld solution treatment were slightly different compared to the base material. After the weld heat treatment, as solution temperature and time rose, the total amount of precipitates size slightly larger, such as TiC. (4) After heat treatment, the hardness of weld and base metal relative to the initial value had certain decline. Weld hardness drop of small changes relative to the base metal. On the other side, as the temperature increases, the tensile strength decreased and elongation increased, varying greatly changed the size of dimple depth, showed a ductile fracture.