Backscattered electron microscopy technique enhancing stretch zone width imaging for initiation fracture toughness measurements

被引:8
作者
Tarpani, JR [1 ]
Bose, WW [1 ]
Spinelli, D [1 ]
机构
[1] Univ Sao Paulo, Engn Sch Sao Carlos, Mat Aeronaut & Automot Engn Dept, BR-13566590 Sao Carlos, SP, Brazil
基金
巴西圣保罗研究基金会;
关键词
Charpy impact testing; dynamic fracture toughness; quantitative fractography; stretch zone width; thermal embrittlement;
D O I
10.1016/j.matchar.2003.10.009
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Backscattered and secondary electron microscopy techniques have been compared in determining critical stretch zone widths (SZW(C)) formed in the original and thermally embrittled microstructures of a nuclear reactor pressure vessel steel tested under Charpy impact loading conditions. It has been shown that the former technique does improve fracture surface image quality, as compared to the widely used secondary electron imaging mode, and so accurate measurements of initiation fracture toughness have been achieved over the whole range of mechanical behavior studied. Hence, a Hall-Petch dependence of the SZWC on the representative cell size of the materials tested could be identified. (C) 2003 Elsevier Inc. All rights reserved.
引用
收藏
页码:159 / 170
页数:12
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