Effects of returns on composition, microstructure and mechanical properties of GH4169 superalloy

• Published in: China foundry Vol. 14; no. 4; pp. 244 - 250
• Main Authors: Pu, Yong-liang, Kou, Sheng-zhong, Zhang, Zhi-dong, Dong, Tian-wen, Guo, Xiao-fan, Qu, Hong-xia
• Format: Journal Article
• Language: English
• Published: Singapore Springer Singapore 01.07.2017; State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China%State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China; Key Laboratory of Non-ferrous Metal Alloys and Processing of the Ministry of Education, Lanzhou University of Technology, Lanzhou 730050,China; Foundry Journal Agency
• Subjects: Engineering; Machines; Manufacturing; Materials Engineering; Metallic Materials; Processes; Research & Development; superalloy; returns proportion; composition; microstructure; mechanical properties; microstructure; composition; 5; returns proportion; TG146.1; mechanical properties; superalloy
• ISSN: 1672-6421; 2365-9459; 1672-6421
• DOI: 10.1007/s41230-017-5125-3

To recycle the returned alloy effectively, effects of returns proportion on alloy composition, microstructure and compression properties of superalloy GH4169 were studied by means of scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and thermal-mechanical simulator. The results show that returns addition has no significant effect on the main alloy elements content and the principle precipitates, but increases the volume fraction of Al 2 O 3 inclusions, resulting in the increase of oxygen level of GH4169 alloy. Returns addition does not change the elastic and plastic deformation process at room temperature or at 1,150 °C, but high returns proportion GH4169 alloy shows improved compression strength and yield strength. The alloy with 100% returns shows a maximum compression strength 1,153.45 MPa at room temperature, while the alloy with 80% returns has a maximum value 69.3 MPa at 1,150 °C. Returns addition increases fluctuation range and reduces the stability of yield strength and compression strength of GH4169 alloy at room temperature. It is noted that the volume fraction and the size of Al 2 O 3 , and the fraction of Laves phase reach their maximum values in the GH4169 alloy with 60% returns, which exhibits maximum yield strength of 516.65 MPa at room temperature and 62.17 MPa at 1,150 °C.