Transactions of Materials and Heat Treatment

Title：Forging process and microstructure control for alloy GH4169 stator blade with little allowance and small size

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ClassificationCode：TG316.3

year,vol(issue):pagenumber：2020,45(1):41-46

Abstract：

For the unqualified problem of grain structure for alloy GH4169 blade forgings, such as mixed grains and coarse grains, based on stator blade of a compressor with little allowance and small size, the forging process route was determined by analysis of forging structure, and the influences and evolution laws of deformation and forging temperature on microstructures were analyzed by twelve sets of experiments consisting of two kinds of billets, five different deformation amounts and four different forging temperatures. Meanwhile, the stability of selected holding time and forging times was analyzed, and the reasonable forging process parameters were obtained. The results show that the deformation amount of 35%-45% obtains uniform structure,but has less effect on grain size. The temperature is the major factor affecting on grain size. However, the grain growth of blade body is obvious when the temperature is over 1000 ℃, and the fine grain of blade body is obtained when the temperature is 990-1000 ℃. Furthermore, the structure is stable during pre-forging, and there is no obvious change in final forging, which means the grain structure is stable in the selected holding time. Thus, the superior comprehensive mechanical properties and fine grain structure of blade forgings are obtained with the deformation amount of 40% and the forging temperature of 990 ℃, which are higher than standard requirements.

Funds：

企业研发项目（KT16Y018-YIY）

作者简介：黄明星(1987-)，男，硕士，工程师 E-mail：78970650@qq.com

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