Revealing the crack formation mechanism of SS/NiTi heterogeneous materials fabricated by wire arc additive manufacturing

被引：0

作者：

Liang, X. D. ^{[1
]}

Zhang, X. G. ^{[1
]}

Wang, W. Q. ^{[1
]}

Liang, J. W. ^{[1
]}

Zhao, X. H. ^{[1
]}

Wu, K. ^{[1
]}

Zhang, Z. H. ^{[2
,3
]}

机构：

[1] Jilin Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Automobile Mat, Changchun 130025, Peoples R China

[2] Jilin Univ, Minist Educ, Key Lab Bion Engn, Changchun 130025, Peoples R China

[3] Jilin Univ, Coll Biol & Agr Engn, Changchun 130025, Peoples R China

来源：

MATERIALS CHARACTERIZATION | 2025年 / 223卷

关键词：

Wire arc additive manufacturing; Heterogeneous materials; NiTi alloy; SS alloy; FUNCTIONALLY GRADED MATERIAL; SHAPE-MEMORY ALLOY; STAINLESS-STEEL; TINI ALLOY; MICROSTRUCTURE; METAL; GROWTH; PHASE;

D O I：

10.1016/j.matchar.2025.114879

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Heterostructure materials can break through the limitations of a single material, enabling the efficient and rational utilization of the distinct properties of each constituent material. However, significant disparities in thermophysical and chemical properties between the constituent materials present substantial challenges in the fabrication of heterogeneous materials. A heterogeneous thin-wall material composed of 316 L stainless steel (SS) and NiTi alloy, denoted as SS/NiTi, was fabricated using cold metal transfer welding (CMT)-based wire arc additive manufacturing (CMT-WAAM). Microstructure and compressive mechanical properties of SS/NiTi heterogeneous material were systematically investigated. Elemental interdiffusion occurred between the distinct chemical compositions of the two materials, with a pronounced upward diffusion of Fe and Cr elements from SS, attributed to the bottom-up deposition characteristics of WAAM. At the interface, the microstructures consisted of columnar crystals of SS, fine and coarse dendrites in the region of intense elemental diffusion, and equiaxial crystals of NiTi. Acicular Ni3Ti and tetragonal Fe2Ti and Cr2Ti intermetallic phases were identified in the dendritic region above the interface of the SS/NiTi composite, which exacerbated the brittleness of the heterogeneous material at the interface. When the stress at the interface exceeded a critical threshold, cracks were generated at the interface and extended along the interface and horizontally and vertically in the weak dendritic region. Furthermore, the interfacial strength of the SS/NiTi composite exhibited considerable variability due to the presence of cracks, interfacial stresses, and brittle intermetallic compounds, with a maximum compressive strength of 820.26 MPa. This study provides a comprehensive analysis of the elemental diffusion behavior and microstructural evolution of WAAM SS/NiTi heterogeneous materials at the interface. Additionally, the crack initiation and propagation mechanisms were examined to establish a theoretical foundation for the fabrication of WAAM SS/NiTi heterogeneous composites.

引用

页数：12

共 54 条

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