Hydrogen annealing was used to desulfurize Ni-superalloy PWA 1480 at multiple temperatures (T), times (t), and sample thickness (L). Initial sulfur (6 ppmw) was reduced to below 0.1 ppmw at the extremes. Residual sulfur, predicted by the thin slab diffusion solution, was in broad agreement with the published sulfur diffusivity (D_S,Ni) but did not contract onto one normalized Arrhenius curve. Divergences occurred for low temperature (1000 °C) or extreme values of the diffusion parameter, D_St/L², suggesting limitations.

中文翻译：

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高温合金氢退火脱硫的扩散极限

氢气退火用于在多个温度 ( T )、时间 ( t ) 和样品厚度 ( L )下对 Ni 高温合金 PWA 1480 进行脱硫。在极端情况下，初始硫 (6 ppmw) 降至 0.1 ppmw 以下。薄板扩散溶液预测的残余硫与已公布的硫扩散率（D _S，Ni）大致一致，但未收缩到一条归一化的阿伦尼乌斯曲线上。低温 (1000 °C) 或扩散参数D _S t/L ^{2 的}极值出现分歧，表明存在局限性。