通过SEM分析 ,研究了时效后不同成分Fe Mn Si Cr Ni C系记忆合金形状记忆效应和微观组织。在 112 3K时效时 ,超低碳合金 1的形状回复率随时效时间的增加一直呈直线上升的趋势。含碳 0 .18%合金 2的形状回复率随时效时间的增加而增加 ,在 3 0 0min达到最大值后将随时间的进一步增加而缓慢下降。SEM分析发现在合金 2的晶界和晶内析出富铬 ,富锰和富硅的合金碳化物 ,而合金 1仅在晶界有第二相析出 ,且第二相成分不同于合金 2中的。合金 2中第二相粒子的长大速度显著高于合金 1中第二相粒子的长大速度 ,且数量也多得多 ;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 shape memory effect and microstructure of Fe Mn Si Cr Ni C-based memory alloys after aging were studied by SEM. At 112 K aging, the shape recovery rate of ultra-low carbon alloy 1 tends to increase linearly with the increase of aging time. The shape recovery rate of 0.18% alloy 2 with carbon increased with the aging time, reaching a maximum value at 300 min, then decreased slowly with the further increase of time. SEM analysis found that chromium-rich, manganese-rich and silicon-rich alloy carbides were precipitated in the grain boundaries and grains of Alloy 2, while Alloy 1 only precipitated the second phase at the grain boundaries and the second phase composition was different from that in Alloy 2 . The growth speed of the second phase particles in Alloy 2 is significantly higher than the growth rate of the second phase particles in Alloy 1, and the number of the second phase particles is much more. The shape memory effect of the alloy can be significantly enhanced by aging-strengthening the austenite matrix.