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首页> 美国卫生研究院文献>Materials >Effect of Cementite on the Hydrogen Diffusion/Trap Characteristics of 2.25Cr-1Mo-0.25V Steel with and without Annealing
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Effect of Cementite on the Hydrogen Diffusion/Trap Characteristics of 2.25Cr-1Mo-0.25V Steel with and without Annealing

机译：渗碳对2.25Cr-1Mo-0.25V钢退火和不退火的氢扩散/俘获特性的影响

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Hydrogen embrittlement (HE) is a critical issue that affects the reliability of hydrogenation reactors. The hydrogen diffusivity/trap characteristics of 2.25Cr-1Mo-0.25V steel are important parameters mainly used to study the HE mechanism of steel alloys. In this work, the hydrogen diffusivity/trap characteristics of heat-treated (annealed) and untreated 2.25Cr-1Mo-0.25V steel were studied using an electrochemical permeation method. The microstructures of both 2.25Cr-1Mo-0.25V steels were investigated by metallurgical microscopy. The effect of cementite on the hydrogen diffusivity/trap mechanisms was studied using thermodynamics-based and Lennard–Jones potential theories. The results revealed that the cementite located at the grain boundaries and at the interfaces of lath ferrite served as a kind of hydrogen trap (i.e., an irreversible hydrogen trap). In addition, hydrogen was transported from ferrite to cementite via up-hill diffusion, thereby supporting the hypothesis of cementite acting as a hydrogen trap.
机译：氢脆（HE）是影响氢化反应器可靠性的关键问题。 2.25Cr-1Mo-0.25V钢的氢扩散/俘获特性是重要的参数，主要用于研究钢合金的HE机理。在这项工作中，使用电化学渗透方法研究了热处理（退火）和未处理的2.25Cr-1Mo-0.25V钢的氢扩散/捕集特性。通过冶金显微镜研究了两种2.25Cr-1Mo-0.25V钢的组织。使用基于热力学和伦纳德·琼斯势能理论研究了渗碳体对氢扩散/捕集机理的影响。结果表明，位于晶界和板条铁素体界面处的渗碳体起着一种氢陷阱的作用（即不可逆的氢陷阱）。另外，氢通过上坡扩散从铁素体传输到渗碳体，从而支持渗碳体充当氢阱的假说。

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