Influence of solution temperature on microstructure and high temperature creep properties of DZ125 nickel-base alloy

ABSTRACT

By performing solution treatment at various temperatures, creep property measurements, and microstructural observations, the influence of the solution temperature on the microstructure uniformity and high-temperature creep properties of the DZ125 nickel-based alloy were studied. The results showed that after the solution and aging treatment of the alloy under a relatively low temperature of 1230°C, microstructure inhomogeneities in the dendrite/inter-dendrite regions appeared, and the coarse g¢ phase and eutectic structure in the casted alloy were not removed. The processing and aging treatment of the alloy under a higher solution temperature of 1260°C caused the coarse g¢ phase and eutectic structure within the inter-dendritic area of the alloy to be eliminated, thus enabling the uniform distribution of the fine cubic g¢ phase with a high-volume fraction between the dendrite/inter-dendrite regions and the enhancement of the creep performance of the alloy.

KEYWORDS:

• DZ125 nickel-base alloy
• solution temperature
• creep
• deformation features
• creep damage

Disclosure statement

The authors declare that they have no known competing financial intereste or personal relationships that could hace appeared to influence the work reported in this paper.

Additional information

Funding

This work was supported by Science and Technology Foundation Project of Guizhou province (qiankehejichu [2020]1Y198, qiankehezhicheng[2019]2870), Science and Technology Project of Bijie City (bikehezi[2019]2), Characteristic Key Laboratory of University of Guizhou province (qianjiaoheKYzi[2019]053 and the Young science and technology talent development project of education department of guizhou province (KY[2019]163).