IntroductionRaise boring machines are among the key pieces of equipment used for mining in underground mines. As the core component of the machine, the drill pipe is subjected to significant pressure and friction, and is frequently eroded by dust and water during operation. The failure of drill pipe
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.
