Recrystallization and grain growth behavior of rolled tungsten under VDE-like short pulse high heat flux loads
Recrystallization and grain growth behavior of rolled tungsten under VDE-like short pulse high heat flux loads
复制标题
类VDE短脉冲高热流负荷下轧制钨的再结晶和晶粒长大行为
DOI：
10.1016/j.jnucmat.2012.04.022
复制
发表时间：
2013-02
影响因子：
3.1
通讯作者：
Liu, W.
中科院分区：
文献类型：
--
作者：
Yuan, Y.;Greuner, H.;Boeswirth, B.;Krieger, K.;Luo, G. -N.;Xu, H. Y.;Fu, B. Q.;Li, M.;Liu, W.
在IPP-GARCHING的GLADIS高热流密度(HHF)试验装置上，对中心热流密度为23 mW/m2的轧制中性束分别施加了0.5、1.0和1.5s的短脉冲热载荷。当脉冲宽度达到1.0s时，绝热加载3 mm厚的样品可以观察到快速再结晶。随着脉冲长度的增加，再结晶后的晶粒明显长大。研究了再结晶温度和再结晶晶粒度随温度的变化规律。结果表明，在外加热负荷条件下，W级钢的再结晶温度约为2480℃，比常规再结晶温度高出近1150℃，且再结晶组织细小。发现平均晶粒度的对数(Lnd)与最高表面温度(1/tmax)的倒数成线性关系，由此推算出在短脉冲HHF载荷下Tmax为1.5s的温度范围内，晶粒长大的激活能为4.1 eV。这为预测短脉冲HHF载荷下的结构演化提供了有效的线索。
Short pulse heat loads expected for vertical displacement events (VDEs) in ITER were applied in the high heat flux (HHF) test facility GLADIS at IPP-Garching onto samples of rolled W. Pulsed neutral beams with the central heat flux of 23MW/m2were applied for 0.5, 1.0 and 1.5s, respectively. Rapid recrystallization of the adiabatically loaded 3mm thick samples was observed when the pulse duration was up to 1.0s. Grains grew markedly following recrystallization with increasing pulse length. The recrystallization temperature and temperature dependence of the recrystallized grain size were also investigated. The results showed that the recrystallization temperature of the W grade was around 2480°C under the applied heat loading condition, which was nearly 1150°C higher than the conventional recrystallization temperature, and the grains were much finer. A linear relationship between the logarithm of average grain size (ln d) and the inverse of maximum surface temperature (1/Tmax) was found and accordingly the activation energy for grain growth in temperature evolution up to Tmaxin 1.5s of the short pulse HHF load was deduced to be 4.1eV. This provided an effective clue to predict the structure evolution under short pulse HHF loads.
登录
查看更多内容
DOI：
10.1007/bf00805552
发表时间：
1983-11
期刊：
Soviet Powder Metallurgy and Metal Ceramics
影响因子：
--
作者：
A. Babak
通讯作者：
A. Babak
DOI：
10.1016/j.ijrmhm.2010.03.001
发表时间：
2010-11
影响因子：
3.6
作者：
G. Pintsuk;I. Uytdenhouwen
通讯作者：
G. Pintsuk;I. Uytdenhouwen
DOI：
10.1016/j.ijrmhm.2005.10.012
发表时间：
2006-07
影响因子：
3.6
作者：
C. Denissen;J. Liebe;M. V. Rijswick
通讯作者：
C. Denissen;J. Liebe;M. V. Rijswick
影响因子：
1.7
作者：
T. Tanabe;M. Akiba;Y. Ueda;K. Ohya;M. Wada;V. Philipps
通讯作者：
T. Tanabe;M. Akiba;Y. Ueda;K. Ohya;M. Wada;V. Philipps
DOI：
10.1007/978-0-387-92897-5_100470
发表时间：
1991
期刊：
--
影响因子：
--
作者：
S. Suresh
通讯作者：
S. Suresh