Zr–0.85Sn–0.16Nb–0.37Fe–0.18Cr alloy samples prepared by low-temperature process (LTP) and high-temperature process (HTP) show different corrosion behaviors in 500 °C steam. The former exhibits uniform corrosion, while the latter exhibits nodular corrosion casually. The occurrence of nodular corrosion on HTP samples is attributed to the formation of local alloying elements depletion region in the Zr matrix. During hot rolling at 800 °C, transformation of zirconium from α-phase to β-phase happens locally. Alloying elements migrate to β-phase from its neighboring α-phase. The local β-phase dissolves in the subsequent cold rolling and final annealing, leaving the microstructure with agglomeration of precipitate particles and neighboring alloying elements depletion regions in Zr matrix. And the undesirable microstructure becomes the causation of nodular corrosion.

中文翻译：

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Zr-0.85Sn-0.16Nb-0.37Fe-0.18Cr合金在500℃蒸汽中高温加工引起的球状腐蚀

Zr–0.85Sn–0.16Nb–0​​.37Fe–0.18Cr 合金样品通过低温工艺 (LTP) 和高温工艺 (HTP) 制备，在 500 °C 蒸汽中表现出不同的腐蚀行为。前者表现出均匀腐蚀，而后者则表现出随意的节状腐蚀。HTP 样品发生球状腐蚀是由于在 Zr 基体中形成了局部合金元素耗尽区。在 800 °C 的热轧过程中，锆从 α 相到 β 相的转变发生在局部。合金元素从其相邻的 α 相迁移到 β 相。局部 β 相在随后的冷轧和最终退火中溶解，在 Zr 基体中留下沉淀颗粒和邻近合金元素耗尽区的聚集的显微组织。