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Effect of Cyclic Aging on Mechanical Properties and Microstructure of Maraging Steel 250

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Abstract

The effects of thermal cyclic aging on mechanical properties and microstructure of maraging steel 250 were studied using hardness tester, tensile testing machine, impact tester, optical, scanning electron, and stereo microscopy. Samples were solution annealed at 1093 K for 1 h followed by air cooling to form bcc martensite. Cyclic aging treatments were carried out at 753 and 773 K for varying time periods. Increase in hardness and strength with corresponding decrease in ductility and impact strength was observed with increasing aging cycles. Reverted austenite was detected by x-ray diffraction technique formed as a result of cyclic aging. The presence of reverted γ was also confirmed by EDX-SEM analysis and attributed to the formation of Mo- and Ni-rich regions which transformed to γ on cooling. Heterogeneity in composition and amount of reverted γ was found to increase with increase in aging cycles and aging time. Fractography reveals the change in fracture mode from ductile dimple-like to brittle cleavage with increase in hardness and strength due to cyclic aging.

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Acknowledgments

The authors thank Mr. Muhammad Saraf (Deputy Chief Manager) and Dr. Sajid Mirza (Senior Chief Manager) for their valuable suggestions and Mr. Raza Hussain (Chairman SUPARCO) for their guidance and provision of facilities. The authors also like to thank Mr. Badar-ul-Hassan (Technical Officer) for his technical assistance and discussion throughout the experimental work.

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

    Fawad Tariq, Nausheen Naz & Rasheed Ahmed Baloch

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  1. Fawad Tariq
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  2. Nausheen Naz
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  3. Rasheed Ahmed Baloch
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Correspondence to Fawad Tariq.

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Tariq, F., Naz, N. & Baloch, R.A. Effect of Cyclic Aging on Mechanical Properties and Microstructure of Maraging Steel 250. J. of Materi Eng and Perform 19, 1005–1014 (2010). https://doi.org/10.1007/s11665-009-9583-7

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  • DOI: https://doi.org/10.1007/s11665-009-9583-7

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