Cui Qiaoqi, Wu Junsheng, Xie Donghan, Wu Xiaoguang, Huang Yunhua, Li Xiaogang
Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China.
Ningbo Institute of Material Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, China.
Materials (Basel). 2017 Jun 28;10(7):721. doi: 10.3390/ma10070721.
In this paper, the effects of dispersed 3~10 nm NbC precipitates on hydrogen diffusion in X80 pipeline steel were investigated by means of high resolution transmission electron microscopy (HRTEM), electrochemical hydrogen permeation, and thermal desorption spectroscopy (TDS). The relationship between hydrogen diffusion and temperature was determined for Nb-free X80 and 0.055 wt% Nb X80 steel. The temperature dividing reversible and irreversible traps was measured, and the quantity of hydrogen captured by different traps was calculated. Three types of hydrogen trap were designed and applied in the test, and the results revealed that irreversible hydrogen traps formed by nanosized and coherent NbC precipitates markedly hindered hydrogen diffusion, and prolonged breakthrough time in Nb-bearing X80 steel.
本文通过高分辨率透射电子显微镜（HRTEM）、电化学氢渗透和热脱附光谱（TDS）研究了3~10 nm弥散分布的NbC析出相对X80管线钢中氢扩散的影响。测定了不含Nb的X80钢和含0.055 wt% Nb的X80钢中氢扩散与温度的关系。测量了区分可逆陷阱和不可逆陷阱的温度，并计算了不同陷阱捕获的氢量。试验中设计并应用了三种类型的氢陷阱，结果表明，纳米尺寸且共格的NbC析出物形成的不可逆氢陷阱显著阻碍了氢扩散，并延长了含Nb的X80钢中的穿透时间。
