Microstructure-Based MultiStage Fatigue Modeling of NiTi Alloy Fabricated via Direct Energy Deposition (DED)

被引：15

作者：

Bagheri, Allen ^{[1
]}

Yadollahi, Aref ^{[2
]}

Mahtabi, Mohammad J. ^{[3
]}

Paudel, Yubraj ^{[1
]}

Vance, Ethan ^{[4
]}

Shamsaei, Nima ^{[5
]}

Horstemeyer, Mark F. ^{[6
]}

机构：

[1] Mississippi State Univ, Ctr Adv Vehicular Syst CAVS, Starkville, MS 39762 USA

[2] Univ S Alabama, William B Burnsed Jr Dept Mech Aerosp & Biomed En, Mobile, AL 36688 USA

[3] Univ Tennessee, Dept Mech Engn, Chattanooga, TN 37403 USA

[4] Mississippi State Univ, Dept Mech Engn, Starkville, MS 39762 USA

[5] Auburn Univ, Dept Mech Engn, Auburn, AL 36849 USA

[6] Liberty Univ, Sch Engn, Lynchburg, VA 24515 USA

来源：

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2022年 / 31卷 / 06期

关键词：

additive manufacturing; cyclic deformation; crack incubation; shape memory alloys; nitinol; SHAPE-MEMORY; CYCLIC DEFORMATION; LIFE PREDICTION; MEAN STRAIN; BEHAVIOR; TRANSFORMATIONS; OPTIMIZATION; PROPAGATION; CRYSTAL;

D O I：

10.1007/s11665-022-06603-z

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A microstructure-based multistage fatigue (MSF) model was employed to study the process-structure-property relations for cyclic damage and fatigue life of NiTi alloy fabricated via an additive manufacturing (AM) technique. Various defect characteristics (i.e., level of porosity, pore size, and their spacing) and microstructural features (i.e., grain size, mean grain orientation, and misorientation angles), dictated by the manufacturing and post-manufacturing heat treatment processes, were used to predict the fatigue life of AM and wrought NiTi specimens. The specimens fabricated via AM underwent two different heat treatment conditions (i.e., aging followed by air cooling and annealing followed by water quenching). Using the process-dependent parameters, the MSF model could capture the differences in fatigue behavior of each condition. The predicted lower and upper bounds of fatigue life based on the range observed for microstructural features and defect characteristics were able to account for the scatter observed in experimental fatigue data.

引用

页码：4761 / 4775

页数：15

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