材料期刊网

为了进一步提高 Fe13Mn6Si13Cr4Ni0．1C合金的形状记忆效应,研究了不同预变形量对1073 K时效合金的组织及形状记忆效应的影响.研究结果表明,10％预变形后再时效的合金,形状回复率在时效300 min 时达到(86．1±1．0)％,比固溶态32％提高了169％；5％预变形后再时效的合金,在180 min 时达到最大值(82．9±1．0)％,比固溶态提高了159％,随后形状回复率随时效时间延长略有下降；直接时效合金(无预变形量),在180 min 时达到最大值(46．3±1．0)％,比固溶态提高了44．7％,随后形状回复率也随时效时间延长略有下降.经 SEM 和 XRD 分析,10％预变形后再时效合金所析出的定向 Cr23 C6颗粒最多,也最细小,这是此合金比5％预变形后再时效合金以及直接时效合金形状回复率提高幅度更大的原因.

To further improve shape memory effect in a Fe13Mn6Si13Cr4Ni0.1C alloy,the effect of different amount of pre-deformation on microstructure and shape memory effect in alloys aged at 1 073 K was studied. The results showed that the shape recovery ration in alloys aged after 10% pre-deformation can reach (86.1±1. 0)% at 300 min,increased by 1 69% compared to 32% in a water-quenching alloy.And the shape recovery ra-tion in aged alloys following 5% pre-deformation rises up to the maximum value (82.9±1.0)% at 180 min,in-crease by 159% compared with 32%,but it slightly decreases with ageing time over 180 min.The shape recov-ery ration for directly aged alloys without pre-deformation reaches the peak value (46.3 ± 1.0)% at 180 min, higher 44.7% than 32%,but it gradually falls down over 180 min.By SEM and XRD analysis it was found that aligned Cr23 C6 particles precipitated from alloys aged after 10% pre-deformation are the most,the smallest a-mong the above three alloys.It was just the reason that makes more improvement in shape memory ration for aged alloys following 10% pre-deformation than that for alloys aged after 5% pre-deformation and directly aged alloys.