刘杨,王磊,冯飞,胥国华,张北江,赵光普

• 1:东北大学材料各向异性与织构教育部重点实验室
• 2:钢铁研究总院高温材料研究所

摘要(Abstract)：

对一种镍基高温合金进行电场和脉冲电流处理,研究了电效应对合金组织及腐蚀行为的影响。结果表明,在保证力学性能基本不变的前提下,合金的抗晶间腐蚀能力均得到改善。电场作用下,合金中退火孪晶比例增加,使得大量原始大角度晶界被低能晶界取代,连续分布的原始大角度晶界被分割,降低了晶界Cr、Mo等合金元素的贫化程度,从而导致沿晶腐蚀沟的形成与生长被抑制。而脉冲电流对抗腐蚀性能的贡献,主要是由于电效应能够促进合金元素的扩散(尤其是界面扩散速度),使M23C6型碳化物在晶界处呈不连续析出,从而大幅度降低了大角度晶界处合金元素的贫化现象。因此,在保证力学性能不变的前提下,合金的抗晶间腐蚀能力得到大幅度提高。

关键词(KeyWords)： 电场处理;脉冲电流处理;镍基高温合金;电效应;晶间腐蚀

Abstract:

Keywords:

基金项目(Foundation): China Ministry of Science and Technology under Contract(2010CB631203);; National Natural Science Foundation of China(51001021,51171039);; Fundamental Research Funds for the Central Universities(N110410004)

作者(Author): 刘杨,王磊,冯飞,胥国华,张北江,赵光普

DOI: 10.13289/j.issn.1009-6264.2012.s2.008

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