GH4169 alloy is a solid solution aging strengthened nickel based deformation high-temperature alloy with γ 'and γ' 'as the main strengthening phases. This alloy has multiple types of elements, high degree of alloying, and good comprehensive properties such as high strength and good plasticity.
Ultra large support roller forgings are prone to ultrasonic testing failure due to incomplete forging and compaction of the core. This time, the composite forging main deformation process of "upsetting WHF method for elongation+upsetting FM method for elongation" is adopted to achieve forging looseness and porosity, improve stress and inclusion distribution in the core of the steel ingot, and prevent the formation of new crack sources.
Slow cooling after forging will result in coarse structure and the appearance of network carbides, while high-temperature normalizing can improve the segregation of network carbides and materials. Therefore, efforts can be made to improve the annealed structure through two aspects: appropriate rapid cooling after forging, high-temperature normalizing, and finally spheroidization annealing.
