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Development of Large-Sized Titanium Alloy Ti6Al4V and Nickel-Based Superalloy Inconel-718 Forgings for Reusable Launch Vehicle-Technology Demonstrator Flight


Affiliations
1 Materials and Mechanical Entity, Vikram Sarabhai Space Centre, Thiruvananthapuram 695 022, India
2 Mishra Dhatu Nigam Limited, Hyderabad 500 058, India
 

Ti6Al4V owing to its high specific strength and Inconel-718 due to its high strength and oxidation resistance at elevated temperatures, have been used in Reusable Launch Vehicle-Technology Demonstrator (RLV-TD). Achieving required properties in large cross-section aerospace quality forgings of these alloys is challenging and has not been reported earlier. Hence, thermo-mechanical processing cycles have been devised to realize forgings of ~1400 mm length in these alloys and successfully used in RLV-TD. Forgings of these alloys having desired microstructures and ultrasonic quality of Class-A1 as per AMS 2630 B standard have been realized. This article discusses the processing challenges and solutions thereof.

Keywords

Aerospace Alloys, Forging, Microstructure, Ultrasonic Quality.
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  • Gupta, R. K., Arumugam, M., Karthikeyan, M. K., Pant, B. and Ghosh, B. R., Investigation of ultrasonic indications in Ti alloy (Ti6Al4V) hot formed hemisphere. Eng. Fail. Anal., 2007, 14, 1286–1293.

  • Kuhlman, G. W., Forging of titanium alloys. In Metals Handbook (ed. Semiatin, S. L.), ASM International, Materials Park, OH, USA, 2005, vol. 14A.

  • Gupta, R. K., Anil Kumar, V. and Ram Kumar, P., Effect of multiple step thermo-mechanical working and recrystallization annealing on mechanical properties and microstructure in titanium alloy Ti6Al4V closed die forgings. J. Mater. Eng. Perform., 2016, 25, 2551–2562.

  • Ouchi, C. and Suenaga, H., Effect of hot rolling variables on the mechanical properties of Ti6Al4V alloy. In Ti Science and Technology Vol. 1, Proceedings of the 5th International Conference on Ti Congress (eds Lutjering, G. et al.), Munich, FRG, 1984, pp. 483–490.

  • Azadian, S., Liu-Ying, W. and Warren, R., Delta phase precipitation in Inconel 718. Mater. Character., 2004, 53, 7–16.

  • Yuan, H. and Liu, W. C., Effect of the δ phase on the hot deformation behaviour of Inconel 718. Mater. Sci. Eng. A, 2005, 408, 281–289.

  • Li, R. B., Yao, M., Liu, W. C. and He, X. C., Isolation and determination for δ, γ' and γ" phases in Inconel 718 alloy. Scripta Mater. 2002, 46, 635–638.


Abstract Views: 325

PDF Views: 155




  • Development of Large-Sized Titanium Alloy Ti6Al4V and Nickel-Based Superalloy Inconel-718 Forgings for Reusable Launch Vehicle-Technology Demonstrator Flight

Abstract Views: 325  |  PDF Views: 155

Authors

R. K. Gupta
Materials and Mechanical Entity, Vikram Sarabhai Space Centre, Thiruvananthapuram 695 022, India
V. Anil Kumar
Materials and Mechanical Entity, Vikram Sarabhai Space Centre, Thiruvananthapuram 695 022, India
P. Ramkumar
Materials and Mechanical Entity, Vikram Sarabhai Space Centre, Thiruvananthapuram 695 022, India
U. V. Gururaja
Mishra Dhatu Nigam Limited, Hyderabad 500 058, India

Abstract


Ti6Al4V owing to its high specific strength and Inconel-718 due to its high strength and oxidation resistance at elevated temperatures, have been used in Reusable Launch Vehicle-Technology Demonstrator (RLV-TD). Achieving required properties in large cross-section aerospace quality forgings of these alloys is challenging and has not been reported earlier. Hence, thermo-mechanical processing cycles have been devised to realize forgings of ~1400 mm length in these alloys and successfully used in RLV-TD. Forgings of these alloys having desired microstructures and ultrasonic quality of Class-A1 as per AMS 2630 B standard have been realized. This article discusses the processing challenges and solutions thereof.

Keywords


Aerospace Alloys, Forging, Microstructure, Ultrasonic Quality.

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DOI: https://doi.org/10.18520/cs%2Fv114%2Fi01%2F131-136