Effect of vanadium microalloying on hydrogen embrittlement susceptibility of medium Mn based hot stamping steel
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摘要: 利用慢应变速率拉伸、氢渗透以及氢显试验，结合SEM、TEM、EBSD分析，研究了0.12%钒对中锰热成形钢氢脆敏感性的影响。结果表明，钒微合金化对中锰热成形钢氢脆敏感性具有双重影响：一方面，钒不仅显著细化晶粒、析出了大量的纳米级含钒碳化物，使钢中的氢陷阱密度大幅增加，有效抑制了氢向铁素体/马氏体界面的富集，而且添加钒后长条状铁素体明显减少、小角度晶界占比增加，可进一步抑制裂纹的连续扩展，从而降低试验钢的氢脆敏感性；但另一方面，钒使钢中马氏体含量增加，会在一定程度上增加氢脆发生的风险。在常规的热成型工艺下，钒微合金化产生的有益作用更为显著，使含钒试验钢具备更优异的氢脆抗力。Abstract: The effect of adding 0.12% vanadium on hydrogen embrittlement susceptibility of medium Mn based hot stamping steel was studied by using slow strain rate tensile, hydrogen permeability and hydrogen microprinting experiments, combined with SEM, TEM, and EBSD analysis. The results show that vanadium microalloying on hydrogen embrittlement susceptibility has double effects. On the one hand, vanadium not only significantly refines grains and precipitates a large number of nano-scale vanadium-containing carbides in steel, which greatly increases the hydrogen trap density and effectively inhibites hydrogen enrichment to the ferrite/martensite interface. Moreover, the addition of vanadium reducing the long strip-shaped ferrite and increasing the proportion of small angle grain boundaries can further restrain the continuous crack propagation and decrease the hydrogen embrittlement susceptibility. But on the other hand, vanadium increases the martensite content, which increases the risk of hydrogen embrittlement to a certain extent. Under conventional hot forming process, the beneficial effect of vanadium microalloying is more significant, which makes the test steel containing vanadium has better hydrogen embrittlement resistance.
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图 3 试验钢中大小角度晶界分布
Figure 3. Distribution maps of grain boundary at large angle and small angle in test steels
图 4 试验钢中析出相形貌及EDS能谱分析
Figure 4. Morphology of precipitates and EDS energy spectrum of test steels
图 5 试验钢在未充氢及充氢条件下的工程应力-应变曲线
Figure 5. Engineering strain-stress curves of H-free and H-charged test steels
图 6 试验钢在充氢条件下拉伸断口宏观形貌与断口心部形貌
(a)无钒钢宏观断口形貌；(b)含钒钢宏观断口形貌；(c)无钒钢断口心部形貌；(d)含钒钢断口心部形貌
Figure 6. Macroscopic morphology (a, b) and center morphology (c, d) of tensile fracture in test steels with H-charging
图 7 试验钢在充氢条件下裂纹扩展形貌）
Figure 7. Crack propagation morphology of test steels with H-charging
图 8 银颗粒在组织中的分布(a)及银元素的EDS面分布(b)
Figure 8. Distribution of silver particles (a) and EDS distribution of silver element (b) in microstructure
表 1 试验钢的化学成分
Table 1. Chemical compositions of test steels
% 材料 C Si Mn Al Nb Ti V Fe 无钒钢 0.22 0.22 5.12 2.94 0.02 0.01 Bal 含钒钢 0.23 0.20 5.37 2.88 0.02 0.03 0.12 Bal 
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