Effect of titanium content on hydrogen embrittlement behavior of bainite/martensite dual-phase steel
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摘要: 冶炼了三种不同钛含量（0、0.9%和1.8%）的贝氏体-马氏体双相钢，通过热处理调整试样中贝氏体含量使其保持相同的强度水平，借助电化学充氢和慢应变速率拉伸试验手段研究了贝氏体含量对贝氏体-马氏体双相钢抗氢脆行为的影响。试验结果表明，钛含量为1.8%的试验钢中具有最高的贝氏体含量和最优异的抗氢脆性能，这主要归因于渗碳体-铁素体界面位错等不可逆陷阱对氢原子的俘获作用。为了提高贝氏体-马氏体双相钢的抗氢脆能力，可增加贝氏体组织中细小渗碳体颗粒的数量，为塑性变形过程中氢的迁移提供更多的不可逆氢陷阱。Abstract: Three kinds of bainite/martensite dual-phase steels with different titanium content (0, 0.9, and 1.8 wt%) were smelted in this paper. The bainite content in the samples was changed by heat treatment to maintain the same strength level. The effect of bainite content on the hydrogen embrittlement resistance of bainite/martensite dual-phase steel was studied by electrochemical hydrogen charging and a slow strain rate tensile test. The results show that the test steel with a titanium content of 1.8 wt% has the highest bainite content and the best resistance to hydrogen embrittlement, mainly due to the capture of hydrogen atoms by irreversible traps such as cementite ferrite interface dislocations. In order to improve the hydrogen embrittlement resistance of bainite/martensite dual-phase steel, the number of fine cementite particles in the bainite structure can be increased, which provides more irreversible hydrogen traps for hydrogen migration during plastic deformation.
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Key words:
- dual-phase steel /
- titanium content /
- hydrogen trap /
- hydrogen embrittlement behavior
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图 2 试样经热处理后的原奥氏体晶界形貌
Figure 2. Grain boundary morphology of original austenite after heat treatment
(a) 1# ；(b) 2# (；c) 3#
图 4 试样的SEM显微组织及局部放大
Figure 4. SEM micrographs and the magnified images of samples
(a) 1# ；(b) 2# ；(c) 3#
图 5 试样的氢渗透曲线 (a) 及氢扩散速率、氢浓度 (b)
Figure 5. Hydrogen permeation curve (a) , hydrogen diffusion rate and hydrogen concentration (b) of the samples
图 6 充氢试样的氢解吸曲线
Figure 6. Hydrogen desorption curve of hydrogen filled sample:(a) before stretching,(b) after stretching
图 7 试样断裂强度随充氢电流密度的变化
Figure 7. Variation of fracture strength of sample with hydrogen charging current density
图 8 充氢电流密度10 A/m2条件下充氢试样的断口形貌
Figure 8. Fracture surface morphology of hydrogen charged specimens with hydrogen charging density 10 A/m2
(a) 1# ；(b) 2# ；(c) 3#
表 1 试验钢的主要化学成分
Table 1. Main chemical compositions of tested steels
% 编号 C Si Mn Cr V Mo Ti 1# 0.403 0.102 0.413 1.02 0.108 0.601 0.003 2# 0.398 0.100 0.406 1.01 0.107 0.596 0.902 3# 0.405 0.107 0.407 1.02 0.110 0.599 1.82 
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