Creep failure of a solution-annealed 15-15Ti steel exposed to stagnant lead-bismuth eutectic at 550 and 600°C
Creep failure of a solution-annealed 15-15Ti steel exposed to stagnant lead-bismuth eutectic at 550 and 600°C
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固溶退火 15-15Ti 钢暴露于 550 和 600°C 停滞铅铋共晶中的蠕变失效
DOI：
10.1016/j.msea.2020.140230
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发表时间：
2020
期刊：
影响因子：
6.4
通讯作者：
Yuan Yin
中科院分区：
文献类型：
--
作者：
Xing Gong;Zhibin Yang;Yangbin Deng;Jun Xiao;Hao Wang;Zhiyang Yu;Yuan Yin
为了研究铅-铋共晶(LBE)对固溶处理的15-15Ti钢蠕变失效行为的影响，进行了550℃和600℃、300℃恒定载荷下的单轴蠕变断裂试验。结果表明，在550℃和600℃的LBE试验中，钢的二次蠕变速率分别是相同温度下空气中试验的56倍和6倍。LBE显著缩短了从一次蠕变到二次蠕变的转变时间。结果表明，15-15Ti与LBE接触后的蠕变寿命显著降低。蠕变性能的严重退化归因于均匀溶解腐蚀(元素浸出)，特别是局部晶间开裂。
Uniaxial creep-to-rupture tests at 550 and 600 °C under a constant load of 300 MPa have been performed to study the effect of lead-bismuth eutectic (LBE) on the creep failure behavior of a solution-annealed 15-15Ti steel. The results show that the secondary creep rate of the steel tested in LBE at 550 and 600 °C is 56 and 6 times higher than that tested in air at the same temperatures, respectively. The transition time from the primary creep to the secondary creep is largely shortened by LBE. As a consequence, the creep life of 15-15Ti in contact with LBE is reduced remarkably. The severe degradation of the creep performance is attributed to uniform dissolution corrosion (elemental leaching) and especially localized intergranular cracking.