Effect of electropulsing treatment on corrosion behavior of nickel base corrosion-resistant alloy  

脉冲电流处理对一种镍基耐蚀合金腐蚀行为的影响(英文)

作　　者：刘杨[1] 王磊[1] 刘红艳[1] 张北江[2] 赵光普[2] 

机构地区：[1]东北大学材料各向异性与织构教育部重点实验室,沈阳110819 [2]钢铁研究总院高温材料研究所,北京100081

出　　处：《Transactions of Nonferrous Metals Society of China》2011年第9期1970-1975,共6页中国有色金属学报（英文版）

基　　金：Project(2010CB631203)supported by National Basic Research Program of China;Project(51001021)supported by the National Natural Science Foundation of China;Projects(20100042120008,20100042110006)supported by the PhD Programs Foundation of Ministry of Education of China

摘　　要：Electropulsing treatment（EPT） was performed on a nickel base corrosion resistant alloy during aging.The effect of EPT on the microstructure and corrosion resistance of the alloy and the mechanisms were investigated.The results show that the intergranular corrosion resistance can be improved substantially without the degradation of mechanical properties of the alloy by EPT.The EPT has an effect of enhancing the interface diffusion rate of the alloying element,which is higher than the body diffusion rate.And thus discontinuous precipitation of M23C6 type carbides appears at the grain boundary in the alloy by EPT,which decreases the depletion extent of the alloying elements at the grain boundary substantially.As a result,the intergranular corrosion resistance of the alloy can be improved by the EPT without any degradation of mechanical properties.将脉冲电流处理应用于一种镍基耐蚀合金的时效过程,研究脉冲电流对合金显微组织及耐蚀性的影响规律及机理。结果表明,脉冲电流处理后,合金在力学性能基本保持不变的前提下,其耐晶间腐蚀性能得到显著提高。脉冲电流能够显著提高合金元素的界面扩散速度,其界面扩散速度远快于体扩散速度,晶界M23C6型碳化物呈典型的不连续析出转变特征。与常规时效处理相比,脉冲电流处理后晶界碳化物的不连续析出转变,使晶界位置的合金元素的贫化程度大幅度降低,在保证合金力学性能的前提下,显著改善合金的耐晶间腐蚀能力。

关 键 词：nickel base alloy ELECTROPULSING discontinuous precipitation intergranular corrosion 

分 类 号：TG133.4[一般工业技术—材料科学与工程]