Effects of boron addition on the microstructure and creep properties of a Ni-Fe-based superalloy weld metal alloy

被引：2
|
作者：
Xie, Wencai [1 ,2 ]
Wu, Dong [1 ]
Lu, Shanping [1 ]
机构：
[1] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
[2] Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
来源：
MATERIALS RESEARCH EXPRESS | 2022年 / 9卷 / 02期
基金：
中国国家自然科学基金;
关键词：
superalloy; weld metal; creep; boron; M23(C; B)6; MECHANICAL-PROPERTIES; WELDABILITY; PERFORMANCE; STABILITY; DUCTILITY; STRENGTH;
D O I：
10.1088/2053-1591/ac5078
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The role of boron in the creep properties and grain boundary characteristics in a new Ni-Fe-based weld metal suitable for advanced ultra-supercritical (A-USC) coal-fired power plant applications has been investigated. Ni-Fe-based filler wires without boron and boron-doped (50 ppm wt% boron) were prepared for this study. Boron-doped weld metals exhibited longer rupture lives and lower steady creep rates during the creep rupture tests at 750 degrees C / 380 MPa and 750 degrees C / 210 MPa. This study explains the improvement mechanism of boron on creep resistance from the perspective of the effect of boron on M23C6. Boron increased the nucleation rate of M23C6 and participated in the formation of M-23(C, B)(6) type boron-carbides. After creep deformation, boron still existed stably in the M-23(C, B)(6). The higher density of discrete M23C6 particles due to boron addition could restrain grain boundary crack propagation and grain boundary sliding, and thereby improve the creep fracture resistance of the GH984G weld metal at 750 degrees C / (380/ 210 MPa).
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页数：12
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