IJAT Vol.13 No.3 pp. 338-345
doi: 10.20965/ijat.2019.p0338


Graded Inconel 625 – SUS316L Joint Fabricated Using Directed Energy Deposition

Ryo Koike*,†, Iori Unotoro*, Yasuhiro Kakinuma*, and Yohei Oda**

*Department of System Design Engineering, Keio University
3-14-1 Hiyoshi, Kouhoku-ku, Yokohama, Kanagawa 223-8521, Japan

Corresponding author

**DMG Mori Co., Ltd., Tokyo, Japan

November 23, 2018
January 31, 2019
May 5, 2019
additive manufacturing, directed energy deposition, Inconel 625, SUS316L, graded material

The joining of dissimilar materials is an important process to produce a large production. In other words, the reliability of such a production is determined by the joining technique because the joint interface often becomes the weakest point against stress. In case of metals, welding and riveting are popular approaches for joining dissimilar materials. However, these techniques generally involve manual and complex operations; therefore, the production quality cannot be maintained, because the accuracy and efficiency of these operations strongly depend on the worker’s skill. From this viewpoint, additive manufacturing (AM) can be useful to produce parts using a combination of dissimilar metals. Metal AM has attracted considerable attention from aerospace and automobile industries recently because of its flexibility and applicability in the production of various complex-shaped parts. Directed energy deposition (DED), one such metal AM method, forms a deposit of powder material and simultaneously irradiates a laser beam on the baseplate. DED can be applied to cladding and repairs as it can be conducted on the surface of the part. In particular, a combined part of dissimilar metals can be easily and directly produced from scratch by changing the powder material of the process. A graded material can also be produced by blending different powders and changing their ratios appropriately. In order to realize such applications of DED, the mechanical properties of the produced part must be evaluated in detail. In this study, a part combining a nickel-based superalloy (Inconel 625) and a stainless steel alloy (SUS316L) is produced using DED; the produced part is evaluated through a tensile strength test, Vickers hardness measurement, metal structure observation, and element distribution analysis. In addition, a graded material is also produced to evaluate the basic characteristics of the joint produced using DED. The experimental results show that the produced joint is sufficiently stiff against tensile stress and its hardness is increased because of the solid solution of niobium in the stainless steel area. The results of the elemental distribution analysis and the Vickers hardness test indicate that a graded joint of Inconel 625 and SUS316L can certainly be produced using DED.

Cite this article as:
R. Koike, I. Unotoro, Y. Kakinuma, and Y. Oda, “Graded Inconel 625 – SUS316L Joint Fabricated Using Directed Energy Deposition,” Int. J. Automation Technol., Vol.13 No.3, pp. 338-345, 2019.
Data files:
  1. [1] G. Levy, R. Schidel, and J. Kruth, “Rapid Manufacturing and Rapid Tooling with Layer Manufacturing (LM) Technologies, State of the Art and Future Perspectives,” CIRP Ann., Vol.52, No.2, pp. 589-609, 2003.
  2. [2] I. Gibson, D. W. Rosen, and B. Stucker, “Additive Manufacturing Technologies,” Springer, p. 238, 2010.
  3. [3] A. Uriondo, M. E. Miguez, and S. Perinpanayagam, “The Present and Future of Additive Manufacturing in the Aerospace Sector: A Review of Important Aspects,” Proc. I MecE Part G, J. of Aerospace Engineering, Vol.229, No.11, pp. 2132-2147, 2015.
  4. [4] Wohlers Report 2015, “Part 4 Industry Growth,” pp. 120-150, 2015.
  5. [5] T. Abe and H. Sasahara, “Dissimilar Metal Deposition with a Stainless Steel and Nickel-based Alloy Using Wire and Arc-based Additive Manufacturing,” Precis. Eng., Vol.45, pp. 387-395, 2016.
  6. [6] T. Abe and H. Sasahara, “Residual Stress and Deformation after Finishing of a Shell Structure Fabricated by Direct Metal Lamination Using Arc Discharge,” Int. J. Automation Technol., Vol.6, No.5, pp. 611-617, 2012.
  7. [7] M. Javidani, J. A. Zavala, J. Danovitch, Y. Tian, and M. Brochu, “Additive Manufacturing of AlSi10Mg Alloy Using Direct Energy Deposition Microstructure and Hardness Characterization,” J. Therm. Spray Tech., Vol.26, pp. 587-597, 2017.
  8. [8] J. S. Keist and T. A. Palmer, “Development of Strength-Hardness Relationships in Additively Manufactured Titanium Alloys,” Mater. Sci. and Eng. A, Vol.693, pp. 214-224, 2017.
  9. [9] Y. Kakinuma, M. Mori, Y. Oda, T. Mori, M. Kashihara, A. Hansel, and M. Fujishima, “Influence of Metal Powder Characteristics on Product Quality with Directed Energy Deposition of Inconel 625,” CIRP Ann., Vol.65, No.1, pp. 209-212, 2016.
  10. [10] A. Kreitcberg, V. Brailovski, and S. Turenne, “Effect of Heat Treatment and Hot Isostatic Pressing on the Microstructure and Mechanical Properties of Inconel 625 Alloy Processed by Laser Powder Bed Fusion,” Mater. Sci. and Eng. A, Vol.689, pp. 1-10, 2017.
  11. [11] J. J. Lewandowski and M. Seifi, “Metal Additive Manufacturing: A Review of Mechanical Properties,” Annual Review of Materials Research, Vol.46, pp. 151-186, 2016.
  12. [12] C. Zhong, A. Gasser, J. Kittel, K. Wissenbach, and R. Poprawe, “Improvement of Material Performance of Inconel 718 Formed by High Deposition-rate Laser Metal Deposition,” Material & Design, Vol.98, pp. 128-134, 2016.
  13. [13] P. J. Withers, I. Todd, and P. B. Prangnell, “The Effectiveness of Hot Isostatic Pressing for Closing Porosity in Titanium Parts Manufactured by Selective Electron Beam Melting,” Metallurgical and Materitals Trans. A, Vol.47, No.5, pp. 1939-1946, 2016.
  14. [14] R. Koike, T. Misawa, Y. Kakinuma, and Y. Oda, “Basic Study on Remelting Process to Enhance Density of Inconel 625 in Direct Energy Deposition,” Int. J. Automation Technol., Vol.12, No.3, pp. 424-433, 2018.
  15. [15] D. G. Ahn, H. J. Lee, J. R. Cho, and D. S. Guk, “Improvement of the Wear Resistance of Hot Forging Dies Using a Locally Selective Deposition Technology with Transition Layers,” CIRP Ann., Vol.65, No.1, pp. 257-260, 2016.
  16. [16] B. E. Carroll, R. A. Otis, J. P. Borgonia, J. O. Suh, R. P. Dillon, A. A. Shapiro, D. C. Hofmann, Z. K. Liu, and A. M. Beese, “Functionally graded material of 304L stainless steel and Inconel 625 fabricated by directed energy deposition: Characterization and thermodynamic modeling,” Acta Materialia, Vol.108, pp. 46-54, 2016.
  17. [17] ASTM Int., “Standard Terminology for Additive Manufacturing Technologies,” F2792-12a, 2013.
  18. [18] P. Mithilesh, D. Varun, A. R. G. Reddy, K. D. Ramkumar, N. Arivazhaganm, and S. Narayanan, “Investigations on Dissimilar Weldments of Inconel 625 and AISI 304,” Procedia Engineering, Vol.75, pp. 66-70, 2014.
  19. [19] Special Metals Corporation, “INCONEL alloy 625.” [Accessed January 21, 2019]
  20. [20] Japanese Industrial Standard, “Hot-rolled Stainless Steel Plate, Sheet and Strip,” JIS G 4304:2012, 2012.
  21. [21] Z. C. Szkopiak, “Hardness of niobium-nitrogen and niobium-oxygen alloys,” J. of the Less Common Material, Vol.19, No.2, pp. 93-103, 1969.
  22. [22] C. K. Gupta and A. K. Suri, “Extractive Metallurgy of Niobium,” CRC Press, Inc., 1993.

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Last updated on May. 10, 2024