Study on hydrogen embrittlement sensitivity of vanadium microalloyed martensite-bainite steel
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摘要: 借助扫描电镜、透射电镜等手段对比研究了无钒和含钒（0.15%）马氏体-贝氏体钢的氢脆敏感性。试验结果表明：钒元素的添加会细化马氏体-贝氏体钢中的原奥氏体组织，并且会增加钢中马氏体相的占比，经回火后钢中钒元素会以碳化物的形式析出，使钢的氢脆敏感性降低。这主要是由于试验钢经钒微合金化后，增加了原奥氏体晶界及碳化物/基体界面等作为氢陷阱的数量，氢捕获位点增加，使氢原子在钢中的扩散系数明显降低，氢原子分布更加分散。Abstract: The hydrogen embrittlement sensitivity of vanadium-free and vanadium-containing (0.15%) martensite-bainite steel was studied utilizing a scanning electron microscope and transmission electron microscope. The test results show that adding vanadium will refine the prior austenite structure in martensite-bainite steel and increase the proportion of the martensite phase in the steel. After tempering, vanadium will precipitate carbide, reducing hydrogen embrittlement sensitivity in the steel. The above phenomenon is mainly because after vanadium microalloying, the test steel will increase the number of prior austenite grain boundary and carbide/matrix interface as hydrogen traps and the concentration sites of hydrogen capture, significantly reducing the diffusion coefficient of hydrogen atoms in the steel, and make the distribution of hydrogen atoms more dispersed.
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图 3 试验钢的EBSD相分布
Figure 3. EBSD phase distribution diagrams of tested steels (martensite in red and bainite in blue)
图 4 试验钢的TEM组织：(a) 1#;(b) 2#及EDS图谱(c)
Figure 4. TEM structures (a: 1#; b: 2#) and EDS spectrum (c) of tested steel
图 5 试验钢在未充氢和充氢条件下应力-应变曲线
Figure 5. Stress-strain curves of tested steel under the conditions of hydrogen-free and hydrogen charging
图 6 试验钢的氢渗透曲线（a）及氢扩散参数（b）
Figure 6. Hydrogen permeation curves (a) and hydrogen diffusion parameters (b) of tested steels
表 1 试验钢的设计成分
Table 1. Chemical compositions of ultra-low bainitic pipeline steel
% 试样 C Mn Si Cr Mo V Ti 1# 0.4 0.3 0.3 1.0 1.2 0 0.005 2# 0.4 0.3 0.3 1.0 1.2 0.15 0.005 
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