AISI 4130钢氢疲劳损伤的高能x射线衍射和小角散射测量

IF 4.8 Q2 ENERGY & FUELS
M.J. Connolly , J-S. Park , J. Almer , M.L. Martin , R. Amaro , P.E. Bradley , D. Lauria , A.J. Slifka
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引用次数: 3

摘要

准确的寿命预测对于重新利用现有的氢气输送管道以及开发最小程度受氢气寿命退化影响的新型钢材至关重要。最终,寿命预测模型评估材料在一个典型的使用周期内所遭受的损伤量,以及材料在失效之前所能承受的累积损伤。然而,并非所有的损伤过程都是相同的,材料在惰性环境中与在氢环境中相比,机械载荷转化为损伤的方式也不相同。例如,在三种主要的氢脆机制(氢增强脱粘(HEDE)、氢增强局部塑性(HELP)和纳米空穴聚结(NVC))中,氢分别增强了晶粒分离、位错产生/移动和空穴聚结的表现。要充分了解损伤模式,需要能够同时探测所有三种机制的测量方法。本文研究了钢在氢介质中疲劳过程中的高能x射线衍射(HEXRD)和小角x射线散射(SAXS)。HEXRD测量探针应变和位错密度;SAXS测量探测纳米孔的产生和聚并。我们将讨论钢在空气和氢气中疲劳损伤模式的差异,以及这些差异在寿命预测中的作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
High energy X-ray diffraction and small-angle scattering measurements of hydrogen fatigue damage in AISI 4130 steel

Accurate lifetime predictions are critical for repurposing existing pipelines for hydrogen transmission as well as for developing novel steels which are minimally susceptible to lifetime degradation by hydrogen. Ultimately, lifetime prediction models assess the amount of damage a material undergoes during a typical service cycle and the cumulative damage a material can withstand prior to failure. However, not all damage processes are equal, and neither is the manner in which mechanical loading translates to damage the same when materials are in inert environments compared to in hydrogen environments. For example, in the three leading proposed mechanisms of hydrogen embrittlement (Hydrogen-Enhanced Decohesion (HEDE), the Hydrogen-Enhanced Localized Plasticity (HELP), and the Nano-Void Coalescence (NVC)), hydrogen is proposed to enhance the manifestation of grain separation, dislocation generation/movement, and void coalescence, respectively. A full understanding of the damage modes requires a measurement capable of probing all three mechanisms at once. Here we present simultaneous High Energy X-ray Diffraction (HEXRD) and Small-Angle X-ray Scattering (SAXS) during fatiguing of steel in hydrogen. HEXRD measurements probe strain and dislocation density; SAXS measurements probe nano-pore generation and coalescence. We will discuss the differences in damage modes between steels fatigued in air and in hydrogen and the role these difference play in lifetime predictions.

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CiteScore
7.50
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