The Effect of Heat Treatment on the Microstructure of Cast Ni-based IN100 Superalloy

Document Type : Original Articles

Authors

• Ahmad Rahimi ¹
• shamsodin mirdamadi ¹
• seyed hosseyn razavi ¹
• seyed mehdi abbasi ²

¹ Iran University of Science and Technology (IUST)

² Metallic Materials Research Center (MMRC), Malek-Ashtar University of Technology

10.22067/ma.v28i1.31424

Abstract

The purpose of this study was to investigate the effect of heat treatment including solution treatment and aging on the microstructure of cast nickel-based IN100 superalloy including size, volume fraction and morphology of primary γ' and different kinds of carbides. For this purpose, different solution heat treatment cycles and a constant aging cycle were implemented on cast ingot samples and the microstructure of the samples were analyzed by scanning electron microscopy and optical microscopy. It was found that, the alloy in the full + partial+ aging treated condition had the optimal combination of γ' morphology, volume fraction and size. In this condition, the alloy possesses a cubic primary γ' with 45% volume fraction which is a significant increase as compared to other cycles. Discrete M_23 C_6 carbides were formed at the grain boundaries and the morphology of the cubic MC carbide was changed to the spherical shape.

Keywords

• Ni-based IN100superalloy
• Solutioning Treatment
• Primaryγ^ˎ
• Carbides
• Solution Temperature

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References

Reed R.C., "The selection of materials for high-temperature applications", The Superalloys Fundamentals and Applications. New York, Cambridge University Press, ch.1, sec.3, pp.14-28, (2006).

2. Doherty B.H, Piearcey B.J., “Tensile and Creep Properties of the Nickle-Base Superalloy IN100”, ActaMettallurgica, Vol. 239, pp.1209-15, (1967).

3. Jin W., Li T., Yin G., “Research on IN100 superalloy ingots”, Science and Technology of Advanced Materials, pp.1–4, (2008).

4. Jovanovic M.T., Tadic S., “Influence of High Temperature Exposure on the Microstructure and Creep Resistance of IN100 Superalloy”, Materials characterization, Vol. 30, pp. 3-12, (1993).

5. R.J. Mitchell, M. Preuss , S.Tinand M.C. Hardy .The influence of cooling rate from temperatures above the γ^ˎ solvus on morphology, mismatch and hardness in advanced polycrystalline nickel-base superalloys. Materials Science and Engineering A, vol. 473, pp.158–165, (2008).

6 .W.E.Voice and R.G.Faulkner. Carbide Stability in Nimonic 80A. Metal. Trans. A, vol. 16, pp. 511-20, (1985).

7. Safari J., Nategh S., “On the heat treatment of Rene80 nickel-base superalloy”, Journal of Materials Processing Technology, Vol. 176, pp. 240-50, (2006).

8. Sajjadi S.A., Zebarjad S.M., Guthrie R.I., Isac M., “Microstructure evolution of high-performance Ni-Base superalloy GTD-111 with heat treatment parameters”, Journal of Materials Processing Technology, Vol.175, pp. 376-81, (2006).

9. Sajjadi S.A., Nategh S., Guthery R.I., “The Study of Microstructure and Mechanical Properties of High Performance Ni-base Superalloy GTD111”, Materials Science and Engineering A, Vol. 325, pp.484–489, (2002).

10. Yang C., Xu Y., Nie H., Xiao X., Jia G., Shen Z., “Effects of heat treatments on the microstructure and mechanical properties of Rene 80”, Materials and Design, Vol. 43, pp.66-73, (2013).

11. Heilmaier M., Leetz U., Reppich B., “Order strengthening in the cast nickel-based superalloy IN100 at room temperature”, Materials Science and Engineering A, Vol. 319–321, pp. 375-378, (2001).

12. Miura N., Kondo Y., Kubushiro K., Takahashi S., “Change in microstructure at grain boundaries with creep deformation polycrystalline nickel-based superalloy IN100 at 1273 °K”, Advanced Materials Research, Vol. 278, pp. 132-37, (2011).

13. Kozar R.W., Suzuki A., Milligan W.W., Schirra J.J., Savage M.F., Pollock T.M., “Strengthening Mechanisms in Polycrystalline Multimodal Nickel-Base Superalloys”, Metallurgical and Materials Transaction A, Vol. 40A, pp. 1588-1603, (2009).

14. SoaresAzevedo e Silva P.R., Baldan R., Nunes C.A., CarvalhoCoelhoa G., Matos da Silva Costa A., “Solution heat-treatment of Nb-modified MAR-M247 superalloy”, Materials Characterization, Vol. 75, pp. 214-19, (2013).

15. Metals Handbook, “Wrougth and P/M superalloys", Properties and characteristics of Nonferrous Metals. ASM, Vol.1, 10th ed., pp. 950-985.

16. سجادی. س.ع. "تاثیر پارامترهای عملیات حرارتی روی ریزساختار و خواص مکانیکی سوپرآلیاژ پایه نیکل GTD-111"، چهارمین کنگره انجمن مهندسین متالورژی ایران، دانشگاه تهران، 1379.

17. Rahmani Kh., Nategh S., "Low cycle fatigue mechanism of Rene 80 at high temperature–high strain", Materials Science and Engineering A, Vol. 494, pp. 385–390, (2008).