Influence of Microstructure on Ultrasonic Attenuation of Forged GH907 Alloy Ring for Aero Engine Turbine Casing

doi:10.11901/1005.3093.2023.173

Chinese Journal of Materials Research

2024, Vol. 38

Issue (1): 14-22 DOI: 10.11901/1005.3093.2023.173

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Influence of Microstructure on Ultrasonic Attenuation of Forged GH907 Alloy Ring for Aero Engine Turbine Casing

LV Tao¹^,², LIU Fang¹, LIU Chang¹, DONG Dexiu³, ZHANG Weihong¹, CAI Guixi¹(

)

1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
3 AECC Shenyang Liming Aero-Engine Co., Ltd., Shenyang 110043, China

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LV Tao, LIU Fang, LIU Chang, DONG Dexiu, ZHANG Weihong, CAI Guixi. Influence of Microstructure on Ultrasonic Attenuation of Forged GH907 Alloy Ring for Aero Engine Turbine Casing. Chinese Journal of Materials Research, 2024, 38(1): 14-22.

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Abstract

Aiming at the matter of unqualified ultrasonic inspection results of the forged GH907 alloy ring used for aero engine turbine casing, the influence of the microstructure on the ultrasonic attenuation of the forged alloy ring is quantitatively assessed by means of ultrasonic testing and microstructure observation, and the cause of the bottom wave loss observed in ultrasonic testing is elucidated. The results show that the shape of the large attenuated area in the ultrasonic bottom wave amplitude image was consistent with that of the black grain area observed in the macrostructure of GH907 alloy, and the average grain size of the black grain area was larger than that of the non-black grain area, and there were a large number of ε phase with the morphology of Widmannsttten structure. The precipitation of a large number of ε phase can increase ultrasonic attenuation by nearly 40%. It is believed that the forging process should be optimized from the following three aspects: grain refinement, controlling the uniformity of grain size and inhibiting excessive precipitation of ε phase, so that to improve the qualification rate of the forged rings.

Key words: measuring and analysis for materials GH907 alloy casing forged ring ultrasonic testing non-uniform microstructure

Received: 13 March 2023

ZTFLH:

TG115.28

Corresponding Authors: CAI Guixi, Tel: 13709823129, E-mail: gxcai@imr.ac.cn

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	LV Tao
	LIU Fang
	LIU Chang
	DONG Dexiu
	ZHANG Weihong
	CAI Guixi

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https://www.cjmr.org/EN/10.11901/1005.3093.2023.173 OR https://www.cjmr.org/EN/Y2024/V38/I1/14

Table 1 Chemical compositions of GH907 alloy (mass fraction, %)

Fig.1 Inspection model and A-scan waveform diagram of GH907 alloy forged ring with immersion ultrasonic testing

Fig.2 Ultrasonic scanning results of GH907 alloy forged ring (a) defect amplitude imaging; (b) bottom wave amplitude imaging; (c) location amplitude distribution curve

Fig.3 Schematic diagram of specimen cutting and numbering for block samples

Fig.4 Bottom wave amplitude imaging of GH907 alloy forged ring test block

Fig.5 Macrostructures of the longitudinal section of GH907 alloy test block

Fig.6 GH907 alloy test block longitudinal section of bottom wave amplitude imaging

Fig.7 Microstructures of non-black grain area and black grain area (a) A1; (b) C1; (c) C4; (d) B4； (e) B5； (f) B6

Fig.8 Relationship between attenuation coefficients and average grain diameter of blocks in non-black grain area

Fig.9 Effect of grain size and uniformity of distribution on ultrasonic attenuation

Fig.10 SEM images of microstructures of GH907 alloy (a) non-black grain area; (b) black grain area

Fig.11 Structure of GH907 alloy before and after solution treatment (a) Macrostructures before solution treatment; (b) Microstructures before solution treatment; (c) SEM images before solution treatment; (d) Macrostructures after solution treatment; (e) Microstructures after solution treatment; (f) SEM images after solution treatment

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