Microstructure of a boron containing high purity nickel-based alloy 640

被引:31
|
作者
Thuvander, M
Stiller, K [1 ]
机构
[1] Chalmers Univ Technol, Dept Expt Phys, SE-41296 Gothenburg, Sweden
[2] Univ Gothenburg, SE-41296 Gothenburg, Sweden
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2000年 / 281卷 / 1-2期
关键词
nickel alloy; precipitation; grain boundary; secondary ion mass spectroscopy; atom probe analysis; transmission electron microscopy; carbide; boride;
D O I
10.1016/S0921-5093(99)00741-8
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
A high purity model alloy with major composition Ni-30Cr-10Fe-0.024C-0.006B (wt.%), corresponding to the commercial Alloy 690. was investigated using secondary ion mass spectroscopy, atom probe analysis and transmission electron microscopy in combination with energy dispersive X-ray analysis and electron energy loss spectroscopy. Solution annealing at 1200 degrees C for 20 min put most carbon and boron into solution, but some intergranular borides and carbides, probably formed during quenching, were observed. Heat treatment at 700 degrees C for 1 and 100 h resulted in substantial intergranular precipitation of Cr23C6 and Cr2B. The influence of boron on the precipitation process in Alloy 690 is discussed and compared with precipitation in Alloy 600. (C) 2000 Elsevier Science S.A. Ail rights reserved.
引用
收藏
页码:96 / 103
页数:8
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