Effects of stress gradient and temperature on mechanical properties of GH4169 superalloy
GH4169 alloy was obtained by a specific metallurgical process and tensile experiments were carried out at different temperature gradients of 550 ℃,650 ℃ and 750 ℃ and different stress levels of 590 MPa,690 MPa and 790 MPa.The mechanical properties of the alloy were obtained,which in turn provided guidance for the optimization of the smelting process.For the elevated temperature tensile test,with the increase of temperature the tensile strength of the steel decreases significantly,while the elong-ation and area shrinkage rate slightly increase,and no obvious change on the precipitation quantity and distribution of δ phase has been found,but the carbide precipitation phase decreases.During elevated temperature endurance test,at the given temperature with the increase of stress the time of permanent fracture decreases continuously.When the stress is given,with the increase of temperature the time of permanent fracture decreases sharply.Through this research the reason for the impoverishment of the y"phase is explained.
GH4169 alloytemperature stretchhigh temperature persistentmechanical propertiespre-cipitates
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