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27-04-2023

Wide-Gap Repair of Mar-M247 Superalloy via Powder Metallurgy Route

Authors: Xiufang Gong, Yankang Yu, Tianjian Wang, Ye Liu, Lin Zhang, Zhenhuan Gao, Hou Ziyong, Xu Chen, Shuang He, Xuanhui Qu

Published in: Metals and Materials International | Issue 11/2023

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Abstract

Wide-gap defects repair of Mar-M247 superalloy was investigated by utilizing powder metallurgy. New interlayer alloy with relatively high content of B and Zr was designed based on the isothermal solidification principle. The interlayer alloy is characterized by relative low melting temperature (1100 °C), and the contact angle of interlayer on the Mar-M247 substrate is ~ 70º. Based on the thermodynamic calculation results, the mixture powders with 80 wt% substrate powder and 20 wt% interlayer alloy powder was used as a filler to repair the wide gap with width of 2 mm. After repaired at 1230 °C for 2 h, near-fully dense gap was obtained. MC-type carbides, MB2-type boride, M3B2-type boride and Ni5(Zr,Hf)-type intermetallic were observed in the liquid zone. After post-weld heat treatment, the block borides, chain carbides and eutectic are successfully removed, and the tensile strength of the bonding zone is close to that of the Mar-M247 superalloy.

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Literature
Metadata
Title
Wide-Gap Repair of Mar-M247 Superalloy via Powder Metallurgy Route
Authors
Xiufang Gong
Yankang Yu
Tianjian Wang
Ye Liu
Lin Zhang
Zhenhuan Gao
Hou Ziyong
Xu Chen
Shuang He
Xuanhui Qu
Publication date
27-04-2023
Publisher
The Korean Institute of Metals and Materials
Published in
Metals and Materials International / Issue 11/2023
Print ISSN: 1598-9623
Electronic ISSN: 2005-4149
DOI
https://doi.org/10.1007/s12540-023-01443-5

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