Microstructure and Mechanical Properties of Resistance Spot Welds for Fe-based Metallic Glass

Abstract

The lap joints of Fe-based metallic glass ribbons were carried by resistance spot welding, and the microstructures of spot welds were investigated by X-ray diffraction and transmission electron microscopy. The results indicated that the perfect formations of joints without typical defects such as spatter were achieved with optimized parameters. Except for little nano-particle Fe₂B, no other crystalline particle was detected by TEM, revealing that the most microstructure in spot weld remains amorphous. The maximum tensile-shearing force was 45.0 N with the optimized parameters of 1 kA weld current, 30 N electrode force and 0.02 ms weld time. The spot weld failed as pullout failure mode propagating along the interface of nugget zone. The study demonstrates that resistance spot welding is an effective and practical welding process for Fe-based metallic glass.

Keywords

Fe-based metallic glass / resistance spot welding / microstructure / tensile-shearing force

References

[1] Pang SJ, Zhang T, Inoue A, et al. Synthesis of Fe-Cr-Mo-C-B-P Bulk Metallic Glasses with High Corrosion Resistance[J]. Acta Materialia, 2002, 50: 489-497.

[2] Tao PJ, Yang YZ, Guan GJ, et al. Effect of Heat Treatment on the Mechanical Properties of FeCoZrWB Bulk Metallic Glass[J]. J. Wuhan University of Techn. -Mater. Sci. Ed., 2012, 27: 547-549.

[3] Kim YW, Bourell DL, Persad C, et al. Consolidation of Metallic Glass Ribbons Using Electric Discharge Welding[J]. Metal. Trans. A, 1988, 19: 1634-1638.

[4] Shin HS. Tool Geometry Effect on the Characteristics of Dissimilar Friction Stir Spot Welded Bulk Metallic Glass to Lightweight Alloys[J]. J. Alloy Comp., 2014, 586: s50-s55.

[5] Kawamura Y, Ohno Y. Metallurgical Bonding of Bulk Metallic Glasses[J]. Mater. Trans., 2001, 42: 717-719.

[6] Wang G, Huang YJ, Maknanlall D, et al. Friction Joining of Ti₄₀Zr₂₅Ni₃ Cu₁₂Be₂₀ Bulk Metallic Glass[J]. J. Mater. Proc. Tech., 2012, 212: 1850-1855.

[7] Wang HS, Chou MS. Microstructure Evolution of the Laser Spot Welded Ni-free Zr-based Bulk Metallic Glass Composites[J]. Intermetallics, 2012, 29: 92-98.

[8] Wang G, Huang YJ, Shen J, et al. Laser Welding of Ti₄₀Zr-25Ni₃Cu₁₂Be₂₀ Bulk Metallic Glass[J]. Mater. Sci. Eng. A, 2012, 541: 33-37.

[9] Kim JY, Kawamura Y. Dissimilar Welding of Zr₄₁Be₂₃Ti₁₄Cu₁₂Ni₁₀ Bulk Metallic Glass and Stainless Steel[J]. Script Mater., 2011, 65: 1033-1036.

[10] Fuijwara K, Fukumoto S, Yokoyama Y, et al. Weld Ability of Zr₅₀Cu₃₀ Al₁₀Ni₁₀ Bulk Glassy Alloy by Small-scale Resistance Spot Welding[J]. Mate. Sci. Eng. A, 2008, 498: 302-307.

[11] Li Y, Luo Z, Yan FY. Effect of External Magnetic Field on Resistance Spot Welds of Aluminum Alloy[J]. Mater. Design, 2014, 56: 1025-1033.

[12] Pouranvari M, Mousavizadeh SM, Ghorbani M. Influence of Fusion Zone Size and Failure Mode on Mechanical Performance of Dissimilar Resistance Spot Welds of AISI 1008 Low Carbon Steel and DP600 Advanced High Strength Steel[J]. Mater. Design, 2011, 32: 1390-1398.

[13] Huang YD. Microwelding Processes and Joint Formation Mechanism of 316L Stainless Steel and Pt-Ir Alloy Wires[D]. 2012 Harbin: Harbin Institute of Technology, China.

[14] Chang BH, Li M V, Zhou Y. Comparative Study of Small Scale and Large Scale Resistance Spot Welding[J]. Sci. Tech. Weld. Join., 2001, 6: 273-280.

[15] Zhou Y. Microjoining and Nanojoining[M]. 2008 Cambridge, United Kingdom: Woodhead Publishing Ltd..

[16] Lee KS, Ha TK, Ahn S, et al. High Temperature Deformation Behavior of the Zr_41.2Ti_13.8Ni₁₀Be_22.5 Bulk Metallic Glass[J]. J. Non-Cry. Solids, 2003, 317: 193-199.

[17] Makhanlall D, Wang G, Shen J. Joining of Ti-based Metallic Glasses Using Resistance Spot Welding Technology[J]. J. Mater. Proc. Tech., 2012, 212: 1790-1795.

[18] Wang HS, Chou MS, Chen HG. The Effects of Initial Welding Temperature and Welding Parameters on the Crystallization Behaviors of Laser Spot Welded Zr-based Bulk Metallic Glass[J]. Mater. Chem. Phys., 2011, 129: 547-552.

[19] Yang GL, Lin X, Huang WD. Laser Solid Forming Zr-based Bulk Metallic Glass[J]. Intermetallics, 2012, 22: 110-115.

[20] Li HX. Preparation Glass Forming Ability and Properties of Fe-based Bulk Metallic Glasses in the Alloy System Fe-C-Si-B-P-M (M=Metallic elements)[D]. 2008 Korea: Kyungpook National University.

[21] Wang HS, Chen HG, Jang JSC. Microstructure Evolution in Nd: YAG Laser-welded (Zr53Cu30Ni9Al8)Si0.5 Bulk Metallic Glass Alloy[J]. J. Alloy. Comp., 2010, 495: 224-228.

[22] Liu W, Sun CJ, Xu XY. The Influences of Nugget Diameter on the Mechanical Properties and the Failure Mode of Resistance Spot Welded Metastable Austenitic Stainless Steel[J]. Mater. Design, 2012, 33: 291-299.