Hydrogen Embrittlement in Al-added Twinning-induced Plasticity Steels Evaluated by Tensile Tests during Hydrogen Charging
Hydrogen Embrittlement in Al-added Twinning-induced Plasticity Steels Evaluated by Tensile Tests during Hydrogen Charging
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DOI：
10.2355/isijinternational.52.2283
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发表时间：
2012-12
影响因子：
1.8
通讯作者：
M. Koyama;E. Akiyama;K. Tsuzaki
中科院分区：
文献类型：
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作者：
M. Koyama;E. Akiyama;K. Tsuzaki
Fe-18 Mn-0.6C-1.5Al钢在阴极充氢拉伸变形过程中发生氢脆。断裂方式为准解理断裂。扩散氢含量与断裂应力的关系与铁素体和无铝马氏体钢相似，均服从幂律关系。在相同的电流密度下，铝的加入并不影响马氏体钢氢脆性能的劣化程度。然而，在相同的环境中，添加Al的钢显示出氢进入的抑制和更大的总伸长率相比，那些的无Al的铁素体钢，虽然Al的添加降低了断裂应力。较大的延伸率是铝提高杯形试样氢脆性能的原因之一。
Hydrogen embrittlement of a Fe–18Mn–0.6C–1.5Al steel was observed in tensile deformation during cathodic hydrogen charging. The fracture mode was quasi-cleavage fracture. The relationship between diffusible hydrogen content and fracture stress was arranged by the power law like that for ferritic and Al-free TWIP steels. The Al addition did not affect the magnitude of the degradation of hydrogen embrittlement property at the same current density in TWIP steels. However, the Al-added steel showed a suppression of hydrogen entry and a larger total elongation in comparison to those of the Al-free TWIP steel in the same environment, although the Al addition decreased fracture stress. The larger elongation is one of the reasons for why the Al addition improves the hydrogen embrittlement property of cup specimens.