INTERFACE CONTROL FOR RESISTANCE TO INTERGRANULAR CRACKING

被引：158
作者：
AUST, KT
ERB, U
PALUMBO, G
机构：
[1] QUEENS UNIV,DEPT MAT & MET ENGN,KINGSTON K7L 3N6,ON,CANADA
[2] ONTARIO HYDRO,DEPT MET RES,TORONTO M8Z 5S4,ON,CANADA
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1994年 / 176卷 / 1-2期
基金：
加拿大自然科学与工程研究理事会;
关键词：
D O I：
10.1016/0921-5093(94)90995-4
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Theoretical and experimental results are presented, with the primary objective of improving the resistance of conventional polycrystalline alloys to intergranular degradation phenomena, through the application of grain boundary design and control. Geometric considerations are discussed, which show that, as a consequence of both energetic and crystallographic constraints associated with twinning, a grain boundary character distribution (GBCD), consisting entirely of low Sigma grain boundaries, is attainable. A geometric model of crack propagation through active intergranular paths is used to evaluate the potential effects of Sigma grain boundary fraction and grain size on intergranular cracking. The effect of the GBCD on intergranular stress corrosion cracking and intergranular corrosion in a nickel-based alloy 600 (Ni-16Cr-9Fe) is determined. Important factors in achieving microstructural optimization of alloy 600 are presented. These results provide direct experimental support for the model of intergranular crack propagation, and demonstrate the importance of grain boundary structure control for enhancing the resistance of a material to inter,oranular degradation.
引用
收藏
页码：329 / 334
页数：6
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