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首页> 外文期刊>Materials Science and Engineering >Changes in mechanical properties following cyclic prestressing of martensitic steel containing vanadium carbide in presence of nondiffusible hydrogen
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Changes in mechanical properties following cyclic prestressing of martensitic steel containing vanadium carbide in presence of nondiffusible hydrogen

机译：在不可扩散氢的作用下，含碳化钒的马氏体钢在循环预应力后的力学性能变化

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摘要

Changes in the states of nondiffusible hydrogen and mechanical properties after cyclic prestressing in the presence of only nondiffusible hydrogen were examined for martensitic steel containing vanadium carbide. The relationship between the change in the state of nondiffusible hydrogen and mechanical properties was also investigated. The hydrogen desorption profile in the high-temperature range decreased and that in the low-temperature range increased with increasing stress amplitude during cyclic prestressing in the presence of only nondiffusible hydrogen. Thus, the application of cyclic prestressing changed the state of hydrogen from a stable to an unstable one because of vacancies and their clusters. Hydrogen embrittlement susceptibility after cyclic prestressing increased with increasing stress amplitude and number of prestressing cycles in the presence of only nondiffusible hydrogen. This relationship indicates that hydrogen embrittlement susceptibility increased with the increasing amount of hydrogen detrapped from trap sites of nondiffusible hydrogen during cyclic prestressing. These results revealed that nondiffusible hydrogen easily detrapped from vanadium carbide due to the application of cyclic prestress and probably interacted with vacancies and their clusters, thus increasing hydrogen embrittlement susceptibility. The change of nondiffusible hydrogen to diffusible hydrogen and accumulation of vacancies and their clusters during cyclic prestressing are concluded to be the dominant factors in hydrogen embrittlement after the application of cyclic prestress.
机译：对于含碳化钒的马氏体钢，研究了在仅存在不可扩散氢的情况下进行循环预应力后，不可扩散氢的状态和力学性能的变化。还研究了不可扩散氢的状态变化与机械性能之间的关系。在仅存在不可扩散氢的情况下，在循环预应力过程中，随着应力振幅的增加，高温范围内的氢解吸曲线减小，而低温范围内的氢解吸曲线增大。因此，由于空位及其簇，循环预应力的应用将氢的状态从稳定状态变为不稳定状态。在仅存在不可扩散氢的情况下，循环预应力后的氢脆敏感性随应力幅度和预应力循环次数的增加而增加。这种关系表明，在循环预应力过程中，随着从不可扩散氢的俘获位点释放出的氢数量的增加，氢脆敏感性也随之增加。这些结果表明，不可扩散的氢由于循环预应力的作用而容易从碳化钒中脱附，并可能与空位及其簇相互作用，从而增加了氢脆敏感性。循环预应力过程中不可扩散氢向扩散性氢的变化以及空位及其簇的积累被认为是施加循环预应力后氢脆的主要因素。

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