Hydrogen Embrittlement of Submicrocrystalline Ultra-Low Carbon Steel Produced by High-Pressure Torsion Straining
Hydrogen Embrittlement of Submicrocrystalline Ultra-Low Carbon Steel Produced by High-Pressure Torsion Straining
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DOI：
10.4028/www.scientific.net/amr.89-91.763
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发表时间：
2010-01
期刊：
影响因子：
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通讯作者：
Y. Todaka;Kazunobu Morisako;M. Kumagai;Y. Matsumoto;M. Umemoto
中科院分区：
文献类型：
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作者：
Y. Todaka;Kazunobu Morisako;M. Kumagai;Y. Matsumoto;M. Umemoto
研究了HPT变形亚微晶超低碳钢的拉伸性能和氢脆行为。通过在5GPa的压缩压力下以0.2rpm的旋转速度进行HPT应变，形成具有高位错密度的300nm厚和600nm长的细长晶粒。HPT处理的超低碳钢的工程拉伸强度为1.9GPa，其与马氏体时效高合金钢的值相似。伸长率随应变增加（在5至10圈时），是由于连续再结晶晶粒的存在而引起的应力集中的减少。HPT处理后的试样在氢气氛下连续旋转5圈后出现HE，拉伸强度达到1.9GPa。然而，通过低温退火的恢复过程，其HE被抑制，同时保持高强度。
The tensile property and hydrogen embrittlement (HE) behavior in the submicrocrystalline ultra-low carbon steel produced by HPT straining were investigated. Elongated grains with 300 nm thickness and 600 nm length with high dislocation density were formed by the HPT straining at a rotation-speed of 0.2 rpm under a compression pressure of 5 GPa. The engineering tensile strength of the HPT processed ultra-low carbon steel for > 5 turns was 1.9 GPa, which is similar to the value of maraging high-alloy steels. The elongation increased with strain (at 5 to 10 turns), is caused by the reduction of the stress concentration due to the existence of continuously recrystallized grains. HE occurred in the HPT processed specimen for 5 turns with high tensile strength of 1.9 GPa under hydrogen atmosphere. However, its HE was suppressed via recovery process by annealing at low temperature while maintaining the high strength.