Hydrogen induced fast fracture
Journal of the Mechanics and Physics of Solids(2020)
摘要
One of the recurring anomalies in the hydrogen induced fracture of high strength steels is the apparent disconnect between their toughness and uniaxial tensile strength in identical hydrogen environments. Here we propose, supported by detailed atomistic and continuum calculations, that unlike macroscopic toughness, hydrogen-mediated tensile failure is a result of a fast-fracture mechanism. Specifically, we show that failure originates from the fast propagation of cleavage cracks that initiate from cavities that form around inclusions such as carbide particles. The failure process occurs in two stages. In stage-A, hydrides rapidly form around the roots of stressed notches on the cavity surfaces with hydrogen fed from the hydrogen gas within the cavity. These hydrides promote cleavage fracture with the cracks propagating at> 100 m s− 1 until the hydrogen gas in the cavity is exhausted. Predictions of this hydrogen …
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关键词
Hydrogen embrittlement,Embedded Atom Model,Fast-fracture
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