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Effect of Mo Content on Carbides at GBs and High-Temperature Tensile Properties of Inconel617 Alloy
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Yuxuan Liu1, 3, Meiqiong Ou2, 3, Jing Ma4, Ming Gao2, 3, Lingzhi Chen4, Xianchao Hao2, 3, Yingche Ma2, 3
Rare Metal Materials and Engineering | 2026, 55(7) : 1816 - 1822
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Rare Metal Materials and Engineering | 2026, 55(7): 1816-1822
Effect of Mo Content on Carbides at GBs and High-Temperature Tensile Properties of Inconel617 Alloy
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Yuxuan Liu1, 3, Meiqiong Ou2, 3, Jing Ma4, Ming Gao2, 3, Lingzhi Chen4, Xianchao Hao2, 3, Yingche Ma2, 3
Affiliations
  • 1.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
  • 2.CAS Key Laboratory of Nuclear Materials and Safety Assessment, Chinese Academy of Sciences, Shenyang 110016, China
  • 3.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
  • 4.China Nuclear Power Engineering Co., Ltd, Beijing 100840, China
Published: 2026-07-10 doi: 10.12442/j.issn.1002-185X.20250132
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Inconel617 alloy has significant application potential in Generation IV nuclear energy systems. The effects of Mo content on carbide precipitation at grain boundaries (GBs) and high-temperature tensile properties of Inconel617 alloy were studied by mechanical testing and advanced techniques such as scanning electron microscope, transmission electron microscope, and electron backscatter diffractometer. The results show that there are only fine granular M23C6 carbide at GBs when the Mo content ranges from 8wt% to 9wt%. However, as Mo content increases from 9.3wt% to 9.6wt%, massive M23C6 and M6C carbides could be predominantly observed at GBs. As Mo content increases from 8.0wt% to 9.6wt%, the elongation increases initially and then decreases, and the alloys with the Mo content of 8.5wt%-9.3wt% achieve optimal strength-ductility balance. The fractographic analysis reveals that the precipitation of granular M23C6 at GBs effectively strengthens grain boundaries, resulting in the transgranular fracture features on the high-temperature tensile fracture surface. When massive M23C6 and M6C carbides precipitate at GBs, the initiation of intergranular crack is promoted and the intergranular fracture features are observed on the high-temperature tensile fracture surface. The Mo content of Inconel617 alloy for high-temperature components in Generation IV nuclear systems cannot exceed 9.3wt% and it should be controlled with in the range of 8.5wt%-9wt%

Inconel617 alloy  /  Mo content  /  M23C6 carbide  /  M6C carbide  /  high-temperature tensile property
Yuxuan Liu, Meiqiong Ou, Jing Ma, Ming Gao, Lingzhi Chen, Xianchao Hao, Yingche Ma. Effect of Mo Content on Carbides at GBs and High-Temperature Tensile Properties of Inconel617 Alloy[J]. Rare Metal Materials and Engineering, 2026 , 55 (7) : 1816 -1822 . DOI: 10.12442/j.issn.1002-185X.20250132
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Article Info
doi: 10.12442/j.issn.1002-185X.20250132
  • Receive Date：2025-07-05
  • Online Date：2026-07-29
  • Published：2026-07-10
Article Data
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  • Received：2025-07-05
Affiliations
    1.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
    2.CAS Key Laboratory of Nuclear Materials and Safety Assessment, Chinese Academy of Sciences, Shenyang 110016, China
    3.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
    4.China Nuclear Power Engineering Co., Ltd, Beijing 100840, China

Corresponding:

Gao Ming, Researcher, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, P. R. China, Tel: 0086-24-23971986, E-mail:
Ma Jing, Researcher, China Nuclear Power Engineering Co., Ltd, Beijing 100840, P. R. China, Tel: 0086-10-88022805, E-mail:
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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