This paper reports the degradation assessment of Super304H during the creep by using misorientation-derived parameters (EBSD). The results manifested that with increasing creep time, the change of misorientation parameters (i.e., Kernel Average Misorientation [KAM], grain reference orientation deviation [GROD], Grain Orientation Spread [GOS], and geometrically necessary dislocation [GND] density) of Super304H was significant. Meanwhile, the above parameters presented a non-monotonic variation trend, which decreased slightly at first and then increased at the later. In addition, the increase amplitude of GROD and GOS was larger than the KAM and GND density, which manifest that the GROD and GOS are more suited to the creep degradation assessment of Super304H.

中文翻译：

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使用取向差衍生参数（电子背散射衍射）对 Super304H 奥氏体钢进行蠕变退化评估

本文报告了 Super304H 在蠕变过程中使用错误取向衍生参数 (EBSD) 的退化评估。结果表明，随着蠕变时间的增加，Super304H的取向误差参数（即核平均取向误差[KAM]、晶粒参考取向偏差[GROD]、晶粒取向扩展[GOS]和几何必要位错[GND]密度）发生变化意义重大。同时，上述参数呈现非单调变化趋势，呈先小幅下降后上升的趋势。此外，GROD和GOS的增加幅度大于KAM和GND密度，这表明GROD和GOS更适合Super304H的蠕变退化评估。