Yielding Behavior and Its Effect on Uniform Elongation of Fine Grained IF Steel

被引：69

作者：

Gao, Si ^{[1
]}

Chen, Meichuan ^{[1
]}

Chen, Shuai ^{[1
]}

Kamikawa, Naoya ^{[2
]}

Shibata, Akinobu ^{[1
]}

Tsuji, Nobuhiro ^{[1
,3
]}

机构：

[1] Kyoto Univ, Dept Mat Sci & Engn, Kyoto 6068501, Japan

[2] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

[3] Kyoto Univ, ESISM, Kyoto 6068501, Japan

来源：

MATERIALS TRANSACTIONS | 2014年 / 55卷 / 01期

关键词：

yielding behavior; yield-drop; Hall-Petch relationship; uniform elongation; plastic instability; PLASTIC-DEFORMATION; FLOW; ARB;

D O I：

10.2320/matertrans.MA201317

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Interstitial free (IF) steel specimens with different mean grain sizes ranging from 0.4 to 12 mu m were fabricated by the accumulative roll bonding (ARE) process and subsequent annealing. Tensile tests at room temperature have revealed that by decreasing the mean grain size down to an ultra-fine range, the yielding behavior gradually changes from the continuous yielding to the discontinuous yielding, accompanying a yield drop phenomenon. It has been found that the yield stress of specimens having fine grain sizes shows extra-hardening, deviated from the original Hall-Petch relation for coarse-grained specimens in accordance with the discontinuous yielding. The Hall-Petch analysis also has indicated that the loss in the uniform elongation in the ultrafine grain size range is related to the appearance of the discontinuous yielding behavior.

引用

页码：73 / 77

页数：5

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