论文部分内容阅读
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。
The aging process of GH3044 alloy was studied by using pulse current. The evolution mechanism and mechanism of microstructure of alloy were studied. The mechanism of pulse current treatment to improve the corrosion resistance of alloy was also analyzed. The results show that the pulse current treatment can promote the elemental diffusion in the alloy and change the thermodynamic and kinetic conditions for the precipitation of M23C6 carbide in the grain boundary. The interfacial diffusion speed of alloying elements is significantly increased, and the interfacial diffusion rate is much higher than the diffusion rate. Pulse current treatment alloy grain boundary M23C6 carbide showed a typical discontinuous precipitation transition characteristics. After pulse current treatment, the mechanical properties of the alloy remain unchanged under the premise of intergranular corrosion resistance has been significantly improved.