Evaluation of grain boundary effect on strength of Fe-C low alloy martensitic steels by nanoindentation technique

被引：15
作者：
Li, JX [1 ]
Ohmura, T
Tsuzaki, K
机构：
[1] Univ Sci & Technol Beijing, Dept Mat Phys, Beijing 100083, Peoples R China
[2] Natl Inst Mat Sci, Steel Res Ctr, Tsukuba, Ibaraki 3050047, Japan
来源：
MATERIALS TRANSACTIONS | 2005年 / 46卷 / 06期
关键词：
nanoindentation; iron-carbon low alloy steel; tempered martensite; Hall-Petch plot; grain boundary; locking parameter; carbide;
D O I：
10.2320/matertrans.46.1301
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The grain boundary effect on the strength was evaluated through nanoindentation technique for Fe-0.4C-Cr-Mo steels that were produced by the ausform-tempered (AF) and conventional quench-tempered (QT) processes. A semiquantitative Hall-Petch plot was made to determine the locking parameter k for the two alloys using nanohardness, micro-Vickers hardness, and grain size. The k value for the QT sample is significantly larger than that for the AF sample and is attributed to the film-like carbides on the grain boundaries of the QT sample. The lower k value of the AF sample is one of the factors for the improved delayed fracture property in the AF compared to that of the QT sample.
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页码：1301 / 1305
页数：5
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