Transactions of Materials and Heat Treatment

Title：Investigation on the hot forging process of alloy 617 A-USC steam turbine rotors at 700 ℃

Authors： Zhu Huaishen Nie Yihong Bai Yaguan Cao Zhiyuan Li Mengnie Jiang Ping

Unit： China First Heavy Industries Tianjin Heavy Industries Research & Development Co. Ltd.

KeyWords： advanced-ultra-super-critical (A-USC) Ni-based alloy 617 forging process dynamic recrystallization mechanical properties

ClassificationCode：TG316

year,vol(issue):pagenumber：2016,41(9):7-12

Abstract：

A-USC steam turbine rotor made of alloy 617 is produced, and its forging grain size cannot be

refined by heat treatment because of the large distortion resistance. Therefore, reasonable

forging process parameters must be obtained in order to meet the inherence quality requirement

of the forgings. The initial forging temperature 1180-1200 ℃ and the final forging

temperature 950-1000 ℃of alloy 617 were confirmed by experimental study of forging

performance, dynamic recrystallization and grain growth behavior for alloy 617. Based on the

above process, the ESR ingot of alloy 617 was successfully forged by hydraulic press without

crack on the surface and with a uniform internal structure. Its forging mechanics capability

can fully meet the requirement, and the effectiveness of forging parameters is verified.

Funds：

国家能源应用技术研究及工程示范项目(NY20150101-1)

朱怀沈(1985-)，男，硕士，工程师

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