摘要
利用脉冲电流对GH3044合金进行时效处理,研究了脉冲电流下合金显微组织的演化规律及机制,并对脉冲电流处理改善合金耐蚀性的机理进行了分析。结果表明,脉冲电流处理能够促进合金中的元素扩散,改变晶界M23C6型碳化物析出的热力学及动力学条件,显著提高合金元素的界面扩散速度,使其界面扩散速度远高于体扩散速度。脉冲电流处理后合金晶界M23C6型碳化物呈典型的不连续析出转变特征。经脉冲电流处理后,合金在力学性能基本保持不变的前提下,耐晶间腐蚀性能得到显著提高。
Electropulsing treatment(EPT) was performed on GH3044 alloy during aging. The evolution laws of the microstructure and mechanism of the alloy by EPT were investigated and the mechanisms of improvement of corrosion resistance of the alloy by EPT were also examined. The results show that EPT can promote the interface diffusion rate of the alloying element, which is higher than the body diffusion rate. It appears a discontinuous precipitation of M23C6 type carbides at the grain boundary in the alloy by EPT. As a result, the intergranular corrosion resistance of the alloy is improved by EPT with no degradation of its mechanical properties.
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2011年第S2期80-83,共4页
Journal of Iron and Steel Research
基金
国家重点基础研究发展计划(973)项目(2010CB631203)
国家自然科学基金项目(51001021)
国家教育部博士点专项基金项目(20100042120008
20100042110006)
关键词
脉冲电流处理
GH3044合金
电效应
不连续析出
晶间腐蚀
lectropulsing treatment
GH3044 alloy
electric effect
discontinuous precipitation
intergranular corrosion
