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Investigation into Microstructures of Maraging Steel 250 Weldments and Effect of Post-Weld Heat Treatments

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Abstract

This study was undertaken to gain a better understanding of microstructures obtained by multipass gas tungsten arc welding in maraging steel grade 250. Metallography and microhardness measurements were carried out on sheet and welded joints in as-welded and post-weld aged conditions. It was found that there was a significant amount of reverted austenite formed on cell boundaries of weld metal after aging at 758-823 K for 3-5 h, and was stable at room temperature. Aging at higher temperatures led to an increase in the continuous network of patchy austenite along the cell boundaries. The reason for the above, in our opinion, is the concentrational heterogeneity which characterizes the microstructure of maraging steel welds. No reverted austenite was observed in as-welded specimens. Solution annealing at 1093 K for 1 h did not completely eliminate the chemical heterogeneity associated with weld structures. However, homogenizing at 1373 K produced homogenous structure that on subsequent aging produces austenite-free lath martensitic structure.

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References

  1. Vijay K. Vasudevan, Sung J. Kim and C. Marvin Wayman, Precipitation Reactions and Strengthening Behavior in 18 Wt Pct Nickel Maraging Steels, Metall. Trans. A, 1990, 21A, p 2655-2668

    CAS  ADS  Google Scholar 

  2. M. Ahmed, K. Hasnain, I. Nasim and H. Ayub, Magnetic Properties of Maraging steels in Relation to Nickel Concentration, Metall. Mater. Trans. A, 1995, 26A, p 1869-1876

    Article  CAS  ADS  Google Scholar 

  3. V. E. Laz’ko, Regular Changes in the Strength of Maraging Steels Upon Complex Alloying with Cobalt, Nickel, and Molybdenum, Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, Vol. 2, 2001, p 25–28

  4. Miller, G.P. and Mitchell, W.L., Structure and hardening mechanisms of 18% nickel-cobalt-molybdenum maraging steels, J. Iron Steel Int., 1965, 203, p 899-904

    CAS  Google Scholar 

  5. F.H. Lang and N. Kenyon, Welding of Maraging Steel, WRC Bulletin 159

  6. M.D. Perkas, High-Strength Maraging Steels, Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, vol. 6, 1968

  7. A.F. Edneral and M.D. Perkas, Structural changes during aging of Fe-Ni-Mo Alloys, Fiz. Metal. Metalloved., 1970, 28(5), p 862

    Google Scholar 

  8. A.F. Edneral and M.D. Perkas, The Aging of Martensite of N18K9M5T Steel, Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, vol. 6, 1968, p 18–19

  9. Nickel Development Institute, 18% Nickel Maraging Steels: Engineering Properties, Publication No. 4419, 1976, p 6–7

  10. Shamantha, C.R., Narayanan, R., Iyer, K.J.L., Radhakrishnan, V.M., Seshadri, S.K., Sundararajan, S., Sundaresan S., Tensile properties and fracture toughness of 18Ni (250 grade) maraging steel weldments, Sci. Technol. Weld. Joining, 2000, 5(5), p. 329-337

    Article  Google Scholar 

  11. C.R. Shamantha, R. Narayanan, K.J.L. Iyer, V.M. Radhakrishnan, S.K. Seshadri, S. Sundararajan, S. Sundaresan, Microstructural changes during welding and subsequent heat treatment of 18Ni (250-grade) maraging steel, Mater. Sci. Eng. A, 2000, 287, p 43-51

    Article  Google Scholar 

  12. D. T. Peters and C. R. Cupp, The kinetics of aging reactions in 18 Pct Ni maraging steels, Trans. Metall. Soc. AIME, 1966, 236, p 1420-1429

    CAS  Google Scholar 

  13. M.M. Shtrikman, I.P. Kapranova, and E.T. Romanova, Structure and Properties of Welds in Maraging Steel N18K9M5T, Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, vol. 10, 1972, p 18–22

  14. N.F. Lashko, L.N. Belyakov, L.V. Zaslavskaya, and L.I. Polyanieheva, Phase Composition of Maraging Steels, Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, 1969, 10, p 26–29

  15. O.V. Abramov, A.I. Il’in, and V.M. Kardonskii, Effect of Heat Treatment on the Mechanical Properties of Maraging Steel, Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, vol .4, 1983, p 43–46

  16. J.M. Vehida, Investigation of Experimental Filler Alloys for 18% Ni Maraging Steel (300), The Boeing Company Report D2-236901-1, 1965

  17. D.A. Corrigan, Gas-Shielded Arc Welding of 18% Ni Maraging Steel, Weld. J., 1964, 43(Research Suppl), p 289–294

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Acknowledgments

This research was carried out in the Materials Research and Testing Laboratory of Pakistan Space and Upper Atmosphere Research Commission (SUPARCO). The authors wish to thank Mr. Badar-ul-Hasan for his technical assistance in experimental work, Mr. Muhammad Saraf (Deputy Chief Manager) and Dr. Sajid Mirza (Senior Chief Manager) for their valuable guidance in this work, and Mr. Raza Hussain (Chairman) for the provision of facilities and their suggestions throughout the project.

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  1. Materials Research and Testing Laboratory, Pakistan Space and Upper Atmosphere Research Commission (SUPARCO), Karachi, Pakistan

    Fawad Tariq, Rasheed Ahmed Baloch, Bilal Ahmed & Nausheen Naz

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  1. Fawad Tariq
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  2. Rasheed Ahmed Baloch
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  3. Bilal Ahmed
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Correspondence to Fawad Tariq.

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Tariq, F., Baloch, R.A., Ahmed, B. et al. Investigation into Microstructures of Maraging Steel 250 Weldments and Effect of Post-Weld Heat Treatments. J. of Materi Eng and Perform 19, 264–273 (2010). https://doi.org/10.1007/s11665-009-9455-1

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