Hydrogen embrittlement of manganese-aluminum bainitic steels
首发时间:2011-09-07
Abstract:The hydrogen embrittlement characteristics of a Mn-Al bainitic steel for railway crossings were studied by means of the slow strain rate test (SSRT), the delayed fracture test and X-ray diffraction (XRD) analysis. The binding energies and hydrogen diffusion barriers of an iron unit cell were tested separately with Al, Si and H, and were evaluated by the first principle calculation. The results showed that the hydrogen embrittlement decreased greatly with increased Al content. Microstructure examinations indicated that the content of retained austenite increased with increased Al content, which was as irreversible hydrogen traps and was not sensitive to hydrogen embrittlement. It is found that the characteristics of hydrogen embrittlement identified by SSRT and the delayed fracture test were different. From the first principle calculation, the binding energy of the iron lattice containing aluminum decreased less as compared to those of the cell containing silicon, but the diffusion barriers increased significantly.
keywords: hydrogen embrittlement bainitic steel railway crossing
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Mn-Al贝氏体钢的氢脆特性
摘要:本文通过慢应变速率拉伸试验和X射线分析研究了铁路辙叉用锰铝贝氏体钢的氢脆敏感性,用第一性原理方法计算了分别含有Al,Si,H的铁晶包的结合能及氢扩散势垒。结果表明:随着铝含量的增加,贝氏体钢的氢脆显著降低,作为深陷阱的对氢脆不敏感的残余奥氏体含量增加;由慢应变速率拉伸方法及延迟断裂方法测试的氢脆敏感性不同。从第一性原理计算结果可以看出,含有铝的铁晶包比含硅的晶包的结合能降低较少,但是氢的扩散势垒显著增加。
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