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The microstructure evolution and element segregation of Inconel 617 alloy tungsten inert gas welded joint

Published online by Cambridge University Press:  03 February 2016

Wen Liu ,
Fenggui Lu ,
Xinhua Tang ,
Renjie Yang  and
Haichao Cui
Wen Liu
Affiliation:
Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Fenggui Lu*
Affiliation:
Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Xinhua Tang
Affiliation:
Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Renjie Yang
Affiliation:
Shanghai Turbine Works Company, Shanghai 200240, China
Haichao Cui
Affiliation:
Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Inconel 617 alloy (IN 617) is an important candidate material of advanced ultrasupercritical power unit above 700 °C. However, there are some issues in welding of IN 617 such as constitutional liquation and hot cracking. Tungsten inert gas (TIG) is considered as an effective welding method to join IN 617 because of low heat input and high quality. Investigation of the microstructure variation of TIG welded joint and its correlation with properties is helpful in deep understanding the stability and reliability of IN 617 welded joint. In this paper, the microstructure evolution and element segregation of IN 617 welded joint were investigated systematically. It is found that the base metal (BM) with significant banded structure is characterized by austenitic grains and some secondary phases distribute along the grain boundaries and inside the grains. The fine secondary phases are determined as M23C6 enriched with Cr and Mo elements. A few large polygon phases are identified as Ti(C, N) with a size of about 10 μm. The coarsened secondary phases are observed in the heat affected zone (HAZ) close to BM whilst the lamellar structure enriched with Cr and Mo is present along grain boundaries in the HAZ near the fusion line. The weld metal (WM) is fully austenitic with a dendritic structure and contains particles dispersing in the matrix. The element segregation on grain boundaries of IN 617 welded joint was analyzed by energy dispersive spectrometer. No obvious element segregation was observed in HAZ. In WM, the area in the vicinity of solidification grain boundaries and solidification subgrain boundaries (SSGBs) has a local depletion of Ni and Co while the Cr and Mo have no obvious segregation. Microhardness and high temperature tensile test of BM and WM were conducted. The WM has a little bit larger hardness value than BM and HAZ because of the strengthening effect of SSGBs. The fracture position is determined in the middle of WM, which is attributed to the grain boundary failure in the center of WM. The high temperature tensile properties of the welded joint are close to BM. In this investigation, the constitutional liquation in HAZ and solidification in WM have little effect on the high temperature tensile properties. TIG welding method is proved to be a suitable welding method to join IN 617.

Keywords

IN 617TIG welded jointmicrostructure evolutionelement segregationmechanical properties
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 4 , 29 February 2016 , pp. 435 - 442
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Copyright
Copyright © Materials Research Society 2016 

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References

REFERENCES

Ma, X., Li, Y., and Yang, Y.: Grain refinement effect of pulsed magnetic field on solidified microstructure of superalloy IN718. J. Mater. Res. 24(10), 3174 (2009).Google Scholar
Rösler, J., Götting, M., Del Genovese, D., Böttger, B., Kopp, R., Wolske, M., Schubert, F., Penkalla, H.J., Seliga, T.S., and Thoma, A.: Wrought Ni-base superalloys for steam turbine applications beyond 700° C. Adv. Eng. Mater. 5(7), 469 (2003).Google Scholar
Tang, Y., Wang, Q., Yuan, F., Gong, J., and Sun, C.: High-temperature oxidation behavior of arc ion plated NiCoCrAlYSiB coatings on cobalt-based superalloy. J. Mater. Res. 21(03), 737 (2006).Google Scholar
Viswanathan, R., Henry, J., Tanzosh, J., Stanko, G., Shingledecker, J., Vitalis, B., and Purgert, R.: US program on materials technology for ultra-supercritical coal power plants. J. Mater. Eng. Perform. 14(3), 281 (2005).Google Scholar
Mankins, W., Hosier, J., and Bassford, T.: Microstructure and phase stability of Inconel alloy 617. Metall.Trans. 5(12), 2579 (1974).Google Scholar
Kimball, O., Lai, G., and Reynolds, G.: Effects of thermal aging on the microstructure and mechanical properties of a commercial Ni-Cr-Co-Mo alloy (Inconel 617). Metall. Mater. Trans. A 7(12), 1951 (1976).Google Scholar
He, L., Zheng, Q., Sun, X., Hou, G., Guan, H., and Hu, Z.: M23C6 precipitation behavior in a Ni-base superalloy M963. J. Mater. Sci. 40(11), 2959 (2005).CrossRefGoogle Scholar
Shankar, V., Rao, K.B.S., and Mannan, S.: Microstructure and mechanical properties of Inconel 625 superalloy. J. Nucl. Mater. 288(2), 222 (2001).CrossRefGoogle Scholar
Hillert, M. and Lagneborg, R.: Discontinuous precipitation of M23C6 in austenitic steels. J. Mater. Sci. 6(3), 208 (1971).Google Scholar
Osoba, L., Ding, R., and Ojo, O.: Microstructural analysis of laser weld fusion zone in Haynes 282 superalloy. Mater. Charact. 65, 93 (2012).Google Scholar
Henderson, M., Arrell, D., Larsson, R., Heobel, M., and Marchant, G.: Nickel based superalloy welding practices for industrial gas turbine applications. Sci. Technol. Weld. Joining 9(1), 13 (2004).Google Scholar
Ojo, O., Richards, N., and Chaturvedi, M.: Study of the fusion zone and heat-affected zone microstructures in tungsten inert gas-welded Inconel 738LC superalloy. Metall. Mater. Trans. A 37(2), 421 (2006).Google Scholar
González, M., Martinez, D., Pérez, A., Guajardo, H., and Garza, A.: Microstructural response to heat affected zone cracking of prewelding heat-treated Inconel 939 superalloy. Mater. Charact. 62(12), 1116 (2011).CrossRefGoogle Scholar
Jalilian, F., Jahazi, M., and Drew, R.: Microstructure evolution during transient liquid phase bonding of alloy 617. Metallogr., Microstruct., Anal. 2(3), 170 (2013).Google Scholar
Hosseini, H.S., Shamanian, M., and Kermanpur, A.: Characterization of microstructures and mechanical properties of Inconel 617/310 stainless steel dissimilar welds. Mater. Charact. 62(4), 425 (2011).CrossRefGoogle Scholar
Lin, B., Jin, Y., Hefferan, C.M., Li, S.F., Lind, J., Suter, R.M., Bernacki, M., Bozzolo, N., Rollett, A.D., and Rohrer, G.S.: Observation of annealing twin nucleation at triple lines in nickel during grain growth. Acta Mater. 99, 63 (2015).Google Scholar
Wang, W., Lartigue-Korinek, S., Brisset, F., Helbert, A., Bourgon, J., and Baudin, T.: Formation of annealing twins during primary recrystallization of two low stacking fault energy Ni-based alloys. J. Mater. Sci. 50(5), 2167 (2015).Google Scholar
Liu, W., Lu, F., Yang, R., Tang, X., and Cui, H.: Gleeble simulation of the HAZ in Inconel 617 welding. J.Mater. Process. Technol. 225, 221 (2015).Google Scholar
Oh, J-H., Yoo, B-G., Choi, I-C., Santella, M.L. and Jang, J-i.: Influence of thermo-mechanical treatment on the precipitation strengthening behavior of Inconel 740, a Ni-based superalloy. J.Mater. Res. 26(10), 1253 (2011).CrossRefGoogle Scholar
Jiang, C. and Liu, Z-K.: Computational investigation of constitutional liquation in Al–Cu alloys. Acta Mater. 51(15), 4447 (2003).Google Scholar
Kuźnicka, B.: Influence of constitutional liquation on corrosion behaviour of aluminium alloy 2017A. Mater. Charact. 60(9), 1008 (2009).Google Scholar
Ye, X., Hua, X., Wu, Y., and Lou, S.: Precipitates in coarse-grained heat-affected zone of Ni-based 718 superalloy produced by tungsten inert gas welding. J. Mater. Process. Technol. 217, 13 (2015).Google Scholar
Lipnitskii, A., Nelasov, I., Golosov, E., Kolobov, Y.R., and Maradudin, D.: A molecular-dynamics simulation of grain-boundary diffusion of niobium and experimental investigation of its recrystallization in a niobium-copper system. Russ. Phys. J. 56(3), 330 (2013).CrossRefGoogle Scholar
Bermingham, M.J., McDonald, S.D., StJohn, D.H., and Dargusch, M.S.: The effect of boron on the refinement of microstructure in cast cobalt alloys. J. Mater. Res. 26(07), 951 (2011).Google Scholar
Takaki, S., Kawasaki, K., and Kimura, Y.: Mechanical properties of ultra fine grained steels. J. Mater. Process. Technol. 117(3), 359 (2001).CrossRefGoogle Scholar