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研究了时效温度对Fe - 1 4Mn - 5Si- 8Cr- 4Ni- 0 .2C记忆合金形状记忆效应 ,力学性能和显微组织的影响。结果表明 :合金的形状回复率随时效温度的升高而增加 ,在 1 2 2 3K时达到最大值 ,比固溶态提高了 6 8% ;随后形状回复率随时效温度的进一步升高而急剧下降。时效温度对合金硬度的影响与其对形状回复率的影响是一致的。能谱和波谱分析表明时效析出的第二相是富铬 ,富锰和富硅的 (Fe ,Mn ,Si,Cr) 3 C合金渗碳体 ,且其数量也随时效温度的升高而增加。但当温度高于 1 2 2 3K时 ,第二相粒子不能析出。通过时效强化奥氏体基体 ,可显著提高合金的形状记忆效应。
The effects of aging temperature on the shape memory effect, mechanical properties and microstructure of Fe - 1 4Mn - 5Si- 8Cr- 4Ni- 0.2C memory alloy were studied. The results show that the shape recovery of the alloy increases with the aging temperature and reaches the maximum value at 1223K, which is 68% higher than that of the solid solution. The shape recovery rate sharply increases with the increase of the aging temperature decline. The effect of aging temperature on the hardness of the alloy is consistent with the effect on the shape recovery rate. EDS and EDS analysis showed that the second phase precipitated by aging is a (Fe, Mn, Si, Cr) 3 C-rich cementite that is rich in chromium, manganese and silicon, and its amount increases with aging temperature . But when the temperature is higher than 1 2 2 3K, the second phase particles can not be precipitated. By aging strengthened austenite matrix, can significantly improve the shape memory effect of the alloy.