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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。
The impulse current treatment is applied to the aging process of a nickel base corrosion resistant alloy to study the influence law and mechanism of the impulse current on the microstructure and corrosion resistance of the alloy. The results show that after the pulse current treatment, the mechanical properties of the alloy remain unchanged under the premise of its resistance to intergranular corrosion has been significantly improved. Pulse current can significantly increase the interfacial diffusion rate of alloying elements, and the interfacial diffusion rate is much faster than the bulk diffusion rate. The M23C6 carbides present typical discontinuous precipitation transformation. Compared with the conventional aging treatment, the discontinuous precipitation transformation of the grain boundary carbides after the pulse current treatment significantly reduces the degree of depletion of the alloying elements at the grain boundaries. Under the premise of ensuring the mechanical properties of the alloy, the alloy resistance Intergranular corrosion ability.