Effect of Ferrite on the Precipitation of σ Phase in Cast Austenitic Stainless Steel Used for Primary Coolant Pipes of Nuclear Power Plants
Effect of Ferrite on the Precipitation of σ Phase in Cast Austenitic Stainless Steel Used for Primary Coolant Pipes of Nuclear Power Plants
复制标题
铁素体对核电站一次冷却剂管道用铸造奥氏体不锈钢α相析出的影响
DOI：
10.1590/1980-5373-mr-2017-0209
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发表时间：
2017-09
期刊：
影响因子：
--
通讯作者：
Na Li
中科院分区：
文献类型：
--
作者：
Yongqiang Wang;Na Li
采用等温热处理、光学显微镜（OM）、透射电镜（TEM）和电子探针显微分析（EPMA）等方法研究了Z3 CN 20. 09 M铸造奥氏体不锈钢（卡斯）中铁素体相对σ相析出的影响。讨论了铁素体的不同形态和体积分数对σ相形成机制的影响。随着时效时间的延长，不同组织试样中σ相的析出量均增加，但析出速率有显著差异。粗大铁素体和弥散细小铁素体的试样中σ相的形成最慢。铁素体中Cr含量最低和试样中α/γ界面最少是σ析出最慢的主要原因，它们分别不利于相变动力学和热力学。而窄长铁素体组织中σ相的形成速度最快，这是由于铁素体中存在较多的α/γ界面和较高的Cr含量，有利于σ相的优先形核和形成热力学。
The effect of ferrite phase on the precipitation of σ phase in a Z3CN20.09M cast austenitic stainless steel (CASS) used for primary coolant pipes of pressurized water reactor (PWR) nuclear power plants was investigated by using isothermal heat-treatment, optical microscopy (OM), transmission electron microscopy (TEM) and electron probe microanalysis (EPMA) techniques. The influence of different morphologies and volume fractions of ferrite in the σ phase formation mechanism was discussed. The amount of σ phase precipitated in all specimens with different microstructures increased with increasing of aging time, however, the precipitation rate is significant different. The formation of σ phase in specimens with the coarsest ferrite and the dispersively smallest ferrite is slowest. The lowest level Cr content in ferrite and fewest α/γ interfaces in specimen are the main reasons for the slowest σ precipitation due to they are unfavorable for the kinetics and thermodynamics of phase transformation respectively. By contraries, the fastest formation of σ phase takes place in specimens with narrow and long ferrite due to the most α/γ interfaces and higher Cr content in ferrite which are beneficial for preferential nucleation and formation thermodynamics of σ phase.
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影响因子：
3
作者：
K. W. Wong;C. Shek;Wenjun Zhang;J. Lai
通讯作者：
K. W. Wong;C. Shek;Wenjun Zhang;J. Lai
DOI：
10.1016/j.calphad.2003.08.002
发表时间：
2003-06
影响因子：
2.4
作者：
T. Sourmail;H. Bhadeshia
通讯作者：
T. Sourmail;H. Bhadeshia
影响因子：
3.1
作者：
Yongsun Yi;T. Shoji
通讯作者：
Yongsun Yi;T. Shoji
影响因子：
9.9
作者：
H. Ezuber;A. El-Houd;F. Elshawesh
通讯作者：
H. Ezuber;A. El-Houd;F. Elshawesh
影响因子：
1.7
作者：
Xue, Fei;Wang, Zhao-Xi;Ti, Wenxin
通讯作者：
Ti, Wenxin