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众所周知,某些金属材料吸收氢将导致塑性急剧下降,并可在较低的应力作甩下产生滞后脆性断裂。几十年来,尽管已提出几十种理论来解释产生氢脆的原因,如氢压理论、弱键理论、降低表面能理论、位错传输氢理论、氢致滞后塑性变形理论及氢化物理论等,但却没有一个得到普遍接受。本文从弹性力学及金属物理基本原理出发,提出了氢致滞后开裂的原因是氢促进位错合成这一新的氢脆机理。
It is well-known that the absorption of hydrogen by certain metallic materials leads to a drastic drop in plasticity and can produce a lag brittle fracture at lower stresses. For decades, dozens of theories have been proposed to explain the causes of hydrogen embrittlement such as hydrogen pressure theory, weak bond theory, surface energy reduction theory, dislocation transport hydrogen theory, hydrogen induced hysteresis plastic deformation theory and hydride theory , But none of them is universally accepted. In this paper, starting from the basic principles of elasticity and metal physics, a new hydrogen embrittlement mechanism by which hydrogen promotes dislocation synthesis is proposed.