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Title:: Study on the Evolution Behavior of Metallurgical Defects During Hot Working of GH4169 Alloy Disk Forgings

Author(s):: YANG Ruonan; XIE Mingzhao; XIE Jinli; BI Zhongnan; QIN Hailong; GAO Yangqin; 1. China University of Petroleum (Beijing), Beijing 102249, China 2. Beijing GAONA Materials & Technology Co., Ltd., Beijing 100081, China 3. Beijing Key Laboratory of Advanced High Temperature Materials, Central Iron and Steel Research Institute,Beijing 100081, China

Keywords:: GH4169 alloy; white spots; ultrasonic flaw detection; evolutionary behavior

CLC:

PACS:: TG132.3

DOI:: 10.7502/j.issn.1674-3962.202501022

DocumentCode:

Abstract:: The distribution characteristics and dimensions of metallurgical defects such as white spots are the key factors affecting the service stability of the wheel. In this study, white spots were preset in GH4169 alloy bars. Then the chemical composition and tissue morphology of the preset white spots were characterized by ultrasonic flaw detection and cutting sample observation, respectively. On this basis, the evolution law of metallurgical defects during thermal processing was investigated by combining with finite element simulation. The final study found no significant difference in the chemical composition of the white spots compared with the conventional GH4169 alloy bars/coils, and the main difference is focused on the content of Nb elements. The Nb element in the white spots is 4.5wt%, with a deviation of 1wt% from the standard value. In addition to this, the grain size of the white spots is 50 μm, significantly 5 times larger than that of the traditional tissue. White spots are most likely to occur at the core location of the bar. The probability of white spots arising at the outer edge is the smallest, only 7%. In the hot working process of disk forgings, the white spots in the core, 1/2R and outer edge of the bar are left to the hub, spoke and rim of the disk, respectively. The results of the study can provide scientific and experimental support for controlling the size of internal defects and predicting the location of defect transfer in disk forgings during actual production.

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Study on the Evolution Behavior of Metallurgical Defects During Hot Working of GH4169 Alloy Disk Forgings(PDF)

MATERIALS CHINA[ISSN:1674-3962/CN:61-1473/TG]

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