Hydrogen trapping models in steel
Hydrogen trapping models in steel
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DOI：
10.1007/s11663-000-0032-0
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发表时间：
2000-12-01
影响因子：
3
通讯作者：
Bakker, A
中科院分区：
文献类型：
--
作者：
Krom, AHM;Bakker, A
本文介绍了氢在钢中的作用。俘获增加了氢的溶解度，降低了扩散系数。陷阱的特点在于它们的性质，例如：可逆或不可逆，饱和或不饱和。位错核是饱和可逆圈闭，而空洞和裂纹是不饱和可逆圈闭。建立了一个基于饱和可逆圈闭的圈闭模型，该模型与McNabb和Foster的圈闭模型略有不同。在均衡状态下，圈闭模型与Oriani圈闭模型相对应。Kumnick和Johnson通过实验发现，陷阱密度随着塑性应变的增加而增加。利用他们的陷阱数据表明，当应变率使用标准拉伸试验时，可以假设晶格点和陷阱点之间的氢平衡。
This article describes the role of hydrogen trapping in steel. Trapping increases the solubility of hydrogen and decreases the diffusivity. Traps are characterized by their nature, i:e., reversible or irreversible, saturable or unsaturable. A dislocation core is a saturable, reversible trap, while voids and crack are unsaturable, reversible traps. A trap model based on saturable, reversible traps is developed, which is slightly different from the trap model of McNabb and Foster. In equilibrium, the trap model corresponds to Oriani's trap model. Kumnick and Johnson found experimentally that the trap density increases as the plastic strain increases. Using their trap data, it is shown that equilibrium between hydrogen in lattice sites and trap sites can be assumed when strain rates are used as in standard tensile tests.