孙超谭军应诗浩李聪彭倩赵素琼
金属学报
研究了N18锆合金(Zr--1Sn--0.3Nb--0.3Fe--0.1Cr)发生氢致延迟开裂(DHC)临界最大开裂温度(Tc)和临界最小止裂温度(Th)随氢含量的变化规律; 同时对裂纹尖端偏聚氢含量及静水应力和发生DHC的临界氢含量进行了理论分析, 建立理论模型对临界温度进行理论计算. 结果表明: N18合金发生氢致延迟开裂的临界温度介于相同氢含量下溶解固溶温度与析出固溶温度之间, 且最大开裂温度小于最小止裂温度, 计算的临界温度值与实验值相当吻合, 因此该理论模型能够真实反映N18锆合金的氢致延迟开裂的物理过程.
关键词:
N18锆合金
,
delayed hydride cracking
,
critical temperature
VR. SoBolo.N. Mazurenkoand A.A. Drozd(Institute of Solid State and Semiconductor Physics
,
ASB P. Brovka Str.
,
17
,
Minsk 220072
,
Belarus)
金属学报(英文版)
Galvanomagnetic properties of metals at boiling point of liquid helium and some prob-lems relating to Joule heating in cylinder conductors are investigated by the method of voltage current characteristics. Radial current under an external coaxial magnetic field is used to get high magnetoresistance of conductor. High level of magnetore-sistance in this geometry offers the possibility to investigate a wide range of heat generation. The stabilization of voltage observed in definite current range is discussed in terms of analysis of heat aspects of problem when a heat genemtion function and heat elimination they are regarded at helium temperuture. An electric temperature ordering of system is proposed as a factor responsible for voltage stabilization when the presence of more heated and less heated sections along conductor radius is connected with negativity of derivative of heat elimination function with respect to temperature between first and second boiling crisis.
关键词:
galvanomagnetic property
,
null
,
null
,
null
