粉芯丝材激光增材制造Fe-xMn-6Si-9Cr-5Ni合金记忆性能  

Memory properties of Fe-xMn-6Si-9Cr-5Ni alloy by laser additive manufacturing with powder cored wire

作　　者：朱长顺[1] 毛计洲 王宏宇[1] 黄金雷 朱建 ZHU Changshun;MAO Jizhou;WANG Hongyu;HUANG Jinlei;ZHU Jian(Jiangsu University,Zhenjiang,212013,China)

机构地区：[1]江苏大学,镇江212013

出　　处：《焊接学报》2023年第7期102-108,I0009,共8页Transactions of The China Welding Institution

摘　　要：为提升铁基记忆合金性能,控制增材制造过程中的元素烧损率,使用粉芯丝材激光定向能量沉积技术制备了不同锰含量Fe-xMn-6Si-9Cr-5Ni(x=14,17,20)合金.研究了在不同预变形量下合金的形状回复率和显微组织,进而探究了该合金记忆性能显著提高的机理.结果表明,粉芯丝材激光增材制造Fe-xMn-6Si-9Cr-5Ni合金,在增材制造过程中的元素烧损率仅为25.6%,在沉积态合金中产生了可提高合金记忆性能的降温马氏体.其中,锰的质量分数为17%的合金,在预变形量为4%和6%时的形状回复率分别达到75%(可回复变形量为3%)和63%(可回复变形量为3.78%).创新点:(1)使用可以抑制元素烧损的粉芯丝材作为激光增材制造铁基记忆合金用材,可以大幅减少Mn等易烧损元素的损失.(2)粉芯丝材激光增材制造铁基记忆合金的沉积态组织中存在可以提升合金的记忆性能的降温ε马氏体.(3)阐述了不同锰含量铁基记忆合金在不同预变形量下的记忆性能影响机制.In order to improve the performance of iron-based memory alloys and control the burning loss of elements during additive manufacturing,Fe-xMn-6Si-9Cr-5Ni(x=14,17,20)alloy with varying contents of Mn was prepared by laser directed energy deposition with powder cored wire.The shape recovery rate and microstructure of the alloy under different predeformation amounts were studied,and the memory performance optimization mechanism of the alloy was explored.The results showed that during powder cored wire laser additive manufacturing of Fe-xMn-6Si-9Cr-5Ni alloy,the burning rate of elements was only 25.6%,and low temperature martensites capable of improving the memory performance of the alloy were generted in the deposited alloy.When the mass fraction of Mn accounted for 17%,the shape recovery rate of the alloy reached 75%(with recoverable deformation at 3%)and 63%(with recoverable deformation at 3.78%)at a pre-deformation of 4%and 6%,respectively.Highlights:(1)Powder cored wire was used as the material for laser additive manufacturing of iron-based memory alloys,which could inhibit the burning of elements,thus greatly reduced the loss of burnable elements such as Mn.(2)Low temperatureεmartensites were generated in the sedimentary structure of the iron-based memory alloy produced by laser additive manufacturing with powder cored wire.(3)The influencing mechanism of memory performance of iron-based alloys with varying Mn contents under different predeformation amounts was elaborated.

关 键 词：铁基记忆合金 激光增材制造 粉芯丝材 降温ε马氏体 记忆性能 

分 类 号：TG456.7[金属学及工艺—焊接]