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首页> 外文期刊>Materials Science Research International >Thermal Aging Embrittlement of Tungsten-Alloyed 9%Cr Ferritic Steels and Electrochemical Evaluation
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Thermal Aging Embrittlement of Tungsten-Alloyed 9%Cr Ferritic Steels and Electrochemical Evaluation

机译：钨合金9％Cr铁素体钢的热时效脆化及电化学评价

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摘要

Thermal aging embrittlement of newly developed W-alloyed 9%Cr ferritic steel KA-STBA29/KA-STPA29 (ASME T92/P92) was investigated. In order to clarify the controlling factor of embrittlement, Charpy impact tests were carried out, and characterization of precipitates was determined through use of materials that had been aged under various conditions. Drops in the upper and lower shelf energies and an increase in the fracture appearance transition temperature (FATT) induced by pre-aging were found to be closely associated with an increase in the amount of precipitates, such as the M_(23)C_6 type carbide and the Laves phase. As the result, the drop in impact toughness was found to be uniquely correlated with an increase in the area fraction of the Laves phase. In order to develop a nondestructive procedure for detecting thermal aging embrittlement, the changes in electrochemical properties of KA-STBA29/KA STPA29 induced by pre-aging have been investigated, and the electrochemical polarization technique has been applied to the pre-aged materials. Experimental results on electrochemical polarization measurements revealed that the peak current density "I_p" which appears at a specific potential during potentiodynamic polarization curve measurements in 1N-KOH solution increases linearly with the degree of embrittlement as evaluated by impact absorbed energy at 0℃. This increase in I_p was correlated with an increase in selective dissolution volume of the Laves phase. Consequently, the Charpy impact absorbed energy, along with the degree of thermal aging embrittlement, can be nondestructively 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 T92 / P92）的热时效脆化。为了弄清脆性的控制因素，进行了夏比冲击试验，并通过使用在各种条件下老化的材料来确定沉淀物的特性。发现由预时效引起的上，下层架能量的下降以及断裂外观转变温度（FATT）的增加与析出物的增加密切相关，例如M_（23）C_6型碳化物和Laves相。结果，发现冲击韧性的下降与拉夫斯相的面积分数的增加唯一相关。为了开发一种无损检测热老化脆性的方法，研究了通过预时效引起的KA-STBA29 / KA STPA29电化学性能的变化，并将电化学极化技术应用于预时效材料。电化学极化测量的实验结果表明，在1N-KOH溶液中进行电位动力学极化曲线测量时，在特定电势下出现的峰值电流密度“ I_p”随脆化程度线性增加，该脆化程度通过0℃的冲击吸收能评估。 I_p的增加与Laves相的选择性溶出量增加相关。因此，可以通过电化学技术无损地估计夏比冲击吸收的能量以及热老化脆化的程度。

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