电脉冲处理对FeMnSiCrNiNbC合金NbC析出及记忆效应的影响

Influence of Electropulsing Treatment on the Shape Memory Effect and Precipitation of NbC in Fe-Mn-Si-Cr-Ni-Nb-C Alloy

摘要:

研究了电脉冲处理对FeMnSiCrNiNbC合金形状记忆效应的影响，并对其微观机理进行初步探讨。结果表明，Fe17Mn5Si8Cr5Ni0.5NbC合金经5%预变形，300 V，1 Hz电脉冲处理13次后形状回复率达到80%，比800 ℃时效1000 s获得的最大值提高12%。SEM分析表明，电脉冲处理可在极短的时间内加速诱导大量、细小的NbC颗粒在基体内析出，进而有效地改善了合金的记忆性能并提高了效率。

Abstract:

In order to further enhance shape memory effect (SME) and improve treatment process in Fe-based shape memory alloys, a pre-deformed Fe-Mn-Si-Cr-Ni-Nb-C alloy was subjected to a electropulsing treatment. The results show that the shape memory ratio reached the maximum 80% for the specimen subjected to a 5% pre-deformation and the electropulsing treatment at 300 V and 1 Hz for 13 times, which is 12% greater than that subjected to an ageing at 800 ℃ for 1000 s. In addition, it is found by SEM observation that the electropulsing treatment can induce a large amount of NbC precipitates with small sizes in the bulk at a short time, therefore, improve the shape memory property and increase the efficiency of shape memory effect efficiently.