Effect of direct aging on microstructure, mechanical properties and shape memory behavior of Fe-17Mn-5Si-10Cr-4Ni-(V, C) shape memory alloy fabricated by laser powder bed fusion

被引：11
作者：
Kim, Dohyung [1 ]
Ferretto, Irene [2 ]
Leinenbach, Christian [2 ,3 ]
Lee, Wookjin [4 ]
Kim, Wangryeol [1 ]
机构：
[1] Korea Inst Ind Technol, Dongnam Div, Yangsan 50623, South Korea
[2] Empa Swiss Fed Labs Mat Sci & Technol, Uberlandstr 129, CH-8600 Dubendorf, Switzerland
[3] Ecole Polytech Fed Lausanne, Lab Photon Mat & Characterizat, CH-1015 Lausanne, Switzerland
[4] Pusan Natl Univ, Sch Mat Sci & Engn, Busan 46241, South Korea
来源：
MATERIALS CHARACTERIZATION | 2023年 / 197卷
基金：
新加坡国家研究基金会; 瑞士国家科学基金会;
关键词：
Iron-based shape memory alloy; Electron backscatter diffraction; Laser powder bed fusion; Additive manufacturing; Recovery stress; RECOVERY STRESS FORMATION; SI; TRANSFORMATION; TEXTURE; NANOPRECIPITATION; PERFORMANCE; MARTENSITE; ADDITIONS;
D O I：
10.1016/j.matchar.2023.112705
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In the present study, the effect of two distinct heat treatment conditions on microstructure, mechanical, and shape memory properties of Fe-17Mn-5Si-10Cr-4Ni-(V, C) (wt%) Fe-based shape memory alloy fabricated by laser powder bed fusion (L-PBF) was investigated. Sample directly aged (DA) at 750 degrees C for 6 h from the as-built state contained elongated fcc-gamma grains with a high amount of low angle boundaries, while sample aged after solution treatment (SA) at 1050 degrees C for 2 h showed fully recrystallized equiaxed grains with annealing twins. The DA had finer vanadium carbide (VC) precipitates that were more densely dispersed than the SA. Furthermore, VC precipitates in the DA were formed mostly along the solidification cell boundaries, resulting in the preservation of the solidification cell structure. The DA and the SA showed similar pseudo-elasticity and recovery strains. On the other hand, the yield strength and the recovery stress of the DA were much higher than those of the SA. The high yield and recovery stresses of the DA in comparison to the SA could be ascribed to the fine solidification cell structures and finely distributed VC precipitates in the direct aging followed by rapid solidification of the L-PBF process.
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页数：8
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