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

机译：W合金化9％Cr铁素体钢的热时效脆化及其电化学技术评估

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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℃. 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：研究了新开发的W合金9％Cr铁素体钢KA-STBA29 / KA-STPA29（ASME TO {sub} 2 / P92）的热时效脆化。为了弄清脆性的控制因素，已经使用在各种条件下老化的材料进行了夏比冲击试验和沉淀的确定。拉夫斯相的析出和粗化导致了由于热老化而引起的上，下层架能量的降低以及断裂外观转变温度（FATP）的增加。发现冲击韧性的降低与拉夫斯相的面积分数的增加唯一相关。为了开发用于检测热老化脆化的非破坏性技术，已经研究了由于热老化引起的KA-STBA29 / KA STPA29的电化学性质的变化。电化学极化技术已经应用于热老化的材料。电化学极化测量的实验结果表明，在1N KOH溶液中，在电位动力学极化测量期间出现在特定电势下的峰值电流密度“ I {sub} p”随在0℃时的冲击能评估的脆化程度呈线性增加。 I p的增加对应于Laves相的选择性溶解的增加。结果，可以通过电化学技术估计热老化脆化程度。

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