摘要
用电化学氢渗透技术测量了两组钢（低碳锰钢和低碳锰钛钢）中氢在２０－８０℃的扩散系数，实验结果表明，钢中的夹杂物（ＭｎＳ），第二相［（Ｆｅ，Ｍｎ）Ｃ３，Ｔｉ（Ｃ，Ｎ）］，形变位错对氢的扩散产生明显影响。由Ｏｒｉａｎｉ模型估算出其对氢的捕获能分别是：（Ｆｅ，Ｍｎ）Ｃ３△Ｅｘ＝１８８５０Ｊ／ｍｏｌ；ＭｎＳ夹杂物△Ｅｘ＝２０４９０Ｊ／ｍｏｌ；Ｔｉ（Ｃ，Ｎ）（弥散型，冷轧钢中）△Ｅｘ＝２８３４０Ｊ／ｍｏｌ，Ｔｉ（Ｃ，Ｎ）（粗化后退火钢中）△Ｅｘ＝２７０７０Ｊ／ｍｏｌ，位错（冷轧钢中）△Ｅｘ＝２５９９０Ｊ／ｍｏｌ。根据测量结果，对低碳低合金钢中ＭｎＳ夹杂物和强碳化物形成元素Ｔｉ对其抗氢脆能力的影响进行了讨论。
The diffusion coefficient of hydrogen in two group steels(how-carbon Mn and Mn-Ti steels) was measured by the electrochemical hydrogen permeation technique at temperatures from 20 ℃to 80 ℃. The experimental results showed that inclusions(MnS), second phase and deformed dislocations in the steels had remarkably effect on the diffusion of hydrogen. The hydrogen trapping energies analysed by the Oriani Model were (Fe,Mn) C3 △Ex=18 850 J/mol,MnS type inclusions, △Ex=20 490 J/mol, deformed dislocation (in cold-worked steels),△Ex=25 990 J/mol, Ti(C,N) (in the annealed steels),△Ex=27070 J/mol, Ti(C,N) (in the cold-worked steels) △Ex=28 340 J/mol. According to the measuring results, effects of MnS type inclusions and Titatium elements on the resistence of the hydrogen-induced brittle of steels were discussed.
出处
《江西科学》
1995年第3期130-137,共8页
Jiangxi Science
关键词
合金钢
氢扩散
夹杂物
硫化锰
Low-alloy steel, Hydrogen diffusion, MnS inclusion, Ti(C,N)
