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Thermal aging embrittlement of W alloyed 9%Cr ferritic steels and its evaluation by electrochemical technique

机译：电化学技术的W合金9％Cr铁素质钢的热老化脆化及其评价

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摘要

Thermal aging embrittlement of newly developed W alloyed 9%Cr ferritic steel KA-STBA29/KA-STPA29 (ASME TO{sub}2/P92) has been investigated. In order to clarify the controlling factor of the embrittlement, Charpy impact tests and determination of precipitates have been carried out using materials aged under various conditions. The decrease in the upper and lower shelf energies and the increase in the fracture appearance transition temperature (FATP) due to thermal aging were caused by the precipitation and coarsening of Laves phase. The decrease in the impact toughness was found to be uniquely correlated with the increase in the area fraction of Laves phase. In order to develop a non-destructive technique for detection of the thermal aging embrittlement, changes in electrochemical properties of KA-STBA29/KA STPA29 due to thermal aging have been investigated. The electrochemical polarization technique has been applied to thermally aged materials. Experimental results on electrochemical polarization measurements revealed that the peak current density "I{sub}p" which appeared at a specific potential during potentiodynamic polarization measurements in 1N KOH solution linearly increased with the degree of embrittlement evaluated by the impact energy at 0°C. The increase in I{sub}p corresponded to the increase in selective dissolution of Laves phase. As a consequence, the degree of thermal aging embrittlement can be estimated by the electrochemical technique.
机译：新开发的W合金9％Cr铁素体钢KA-STBA29 / KA-STPA29（ASME至{} 2 / P92）的热老化脆化。为了阐明脆化的控制因子，使用各种条件下老化的材料进行夏比冲击试验和沉淀物的测定。由于疏浚阶段的沉淀和粗化引起了上部和下部质量和较低搁架能量和骨折外观过渡温度（FATP）的增加是由疏浚阶段的沉淀和粗化引起的。发现冲击韧性的降低与疏浚阶段的面积分数的增加是唯一的相关性。为了开发用于检测热老化脆化的非破坏性技术，研究了由于热老化而导致的KA-STBA29 / KA STPA29的电化学性质的变化。电化学偏振技术已应用于热老化材料。电化学偏振测量的实验结果表明，在1N KOH溶液中出现在特定电位的峰值电流密度“I {um} P”在1N KOH溶液中出现在1N KOH溶液中的特定电位线性增加，随着0℃的冲击能量评估的脆化程度。 I {Sub} P的增加对应于熔化液相色谱的选择性溶解。结果，可以通过电化学技术估算热老化脆化程度。

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