Modified forging method for removing coarse grains of GH901 high-temperature alloy disc-shaped forge piece

Abstract

The invention discloses a modified forging method for removing coarse grains of a GH901 high-temperature alloy disc-shaped forge piece. In order to obtain the alloy modified piece with fine grains, the alloy disc-shaped forge piece is machined, forged and shaped to form an annular piece, then the annular piece is heated, and subjected to modified forging and deformed to be formed by seven times offiring, and the deformations of the longitudinal sections of the annular piece are as follows: after first firing, the deformation is 15-20%, after second to fourth firing, the deformation is 10-15%,after fifth to sixth firing, the deformation is 30-35%, and after seventh firing, the deformation is 40-45%. The final heating temperature of the annular piece in the furnace is 1090+ / -10 DEG C, andthe final forging temperature of the forge piece during forging is 950+ / -10 DEG C based on 0.25-0.35min / mm of thickness of the forge piece during insulation. The method is mainly applied to modified forging of the GH901 high-temperature alloy disc-shaped forge piece with coarse grains, and provides proper heat processing process parameters for forging the alloy forge piece with fine grains.

Description

technical field [0001] The invention relates to a forging method, in particular to a modified forging method for removing coarse grains of a GH901 superalloy disc-shaped forging. Background technique [0002] The high-temperature alloy with the brand name GH901 is an austenitic age-hardening alloy based on Fe-43Ni-12Cr and adding strengthening elements such as titanium, aluminum and molybdenum. The aero-engine disc forgings produced by this alloy, such as high-pressure compressor disc forgings, are sensitive to thermal processing parameters in terms of structure and performance, and the forgings have special requirements for metal streamlines. Improper selection of forging methods and process parameters can easily make forgings Coarse grains are produced, resulting in uneven structure and unqualified performance, and the forgings are scrapped. Scrap forgings can only be treated as scrap, which will not only waste the precious alloy material, is not conducive to the recyclin...

AI Technical Summary

Problems solved by technology

The aero-engine disc forgings produced by this alloy, such as high-pressure compressor disc forgings, are sensitive to thermal processing parameters due to their structure and performance, and the special requirements of forgings on metal streamlines. Improper selection of forging methods and process parameters can easily make forgings Coarse grains are produced, resulting in uneven structure and unqualified performance, and the forgings are scrapped

Generally, scrap forgings can only be treated as scrap, which will not only waste the precious alloy material, is not conducive to the recycling of rare metal resources, but also will cause greater economic losses to the manufacturer

[0003] The article "Forging Process Improvement of GH901 Alloy Turbine Shaft" (Tan Haibo et al., "Forging Technology", Volume 32, No. 6, Page 40-42, December 2007) discloses a forging process of GH901 alloy turbine shaft. Process In order to obtain forgings with uniform grains, the method of "changing forging → elongation → heading" is used to forge stepped shaft forgings. This method does not disclose specific process steps and is only applicable to shaft forgings. It is not mentioned how to remove the coarse grains by forging after the shaft forgings produce coarse grains.

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