Fretting behavior of oxide scale formed on ferritic/martensitic steel after pre-exposure to lead-bismuth eutectic
Fretting behavior of oxide scale formed on ferritic/martensitic steel after pre-exposure to lead-bismuth eutectic
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DOI：
10.1016/j.triboint.2023.108507
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发表时间：
2023-04
影响因子：
6.2
通讯作者：
X. Mi;Xue-chao Zheng;Qi Sun;Juan Du;Yixiong Zhang;Yu Qin;L. Chai;Minhao Zhu
中科院分区：
文献类型：
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作者：
X. Mi;Xue-chao Zheng;Qi Sun;Juan Du;Yixiong Zhang;Yu Qin;L. Chai;Minhao Zhu
采用多种表征方法联合研究了铁素体/马氏体钢（T91）在500 ℃铅铋共晶（LBE）预暴露后氧化膜的微观结构和微动行为。结果表明，氧化膜主要由疏松的磁铁矿层和相对致密的铁铬尖晶石层组成，其间有LBE填充的孔洞。与原始材料相比，氧化膜本身具有较弱的抗微动性能。特别是靠近磨痕的氧化皮在微动过程中，在剪切应力和法向应力的联合作用下，更倾向于以脆性破坏的形式逐层剥落。这种现象可能与尖晶石/基体界面上的微裂纹和LBE填充的孔洞导致氧化膜稳定性降低有关。在此基础上，提出了一种可能的氧化膜微动损伤模型。
The microstructure and fretting behavior of oxide scales formed on ferritic/martensitic steel (T91) after pre-exposure to lead-bismuth eutectic (LBE) at 500 ℃ have been investigated by jointly utilizing multiple characterization methods. The results reveal that the oxide scales are mainly composed of a loose magnetite layer and a relatively dense Fe-Cr spinel layer with some LBE-filled holes located between them. Compared to as-received material, the oxide scales themselves possess weaker fretting resistance. In particular, the oxide scales close to the wear track prefer to desquamate layer by layer in the form of brittle failure under combined shear and normal stress during fretting. Such phenomenon may be related to the reduction of oxide scale stability caused by the microcracks located on the spinel/substrate interface and the LBE-filled holes. Accordingly, a possible damage model of oxide scales during fretting was proposed and discussed.