Abstract
The impact toughness of powder metallurgy (PM) steel is typically inferior, and it is further impaired when the microstructure is strengthened. To formulate a versatile PM steel with superior impact, fatigue, and tensile properties, the influences of various microstructures, including ferrite, pearlite, bainite, and Ni-rich areas, were identified. The correlations between impact toughness with other mechanical properties were also studied. The results demonstrated that ferrite provides more resistance to impact loading than Ni-rich martensite, followed by bainite and pearlite. However, Ni-rich martensite presents the highest transverse rupture strength (TRS), fatigue strength, tensile strength, and hardness, followed by bainite, pearlite, and ferrite. With 74 pct Ni-rich martensite and 14 pct bainite, Fe-3Cr-0.5Mo-4Ni-0.5C steel achieves the optimal combination of impact energy (39 J), TRS (2170 MPa), bending fatigue strength at 2 × 106 cycles (770 MPa), tensile strength (1323 MPa), and apparent hardness (38 HRC). The impact energy of Fe-3Cr-0.5Mo-4Ni-0.5C steel is twice as high as those of the ordinary high-strength PM steels. These findings demonstrate that a high-strength PM steel with high-toughness can be produced by optimized alloy design and microstructure.
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Acknowledgments
The authors thank the National Science Council of the Republic of China for their support under contract number NSC 100-2221-E-150-036. Our gratitude is also extended to Lenco Co. for preparing the green specimens and to QMP and Höganäs AB for providing the base powders investigated in this study.
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Manuscript submitted March 22, 2013.
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Wu, MW., Shu, GJ., Chang, SY. et al. A Novel Ni-Containing Powder Metallurgy Steel with Ultrahigh Impact, Fatigue, and Tensile Properties. Metall Mater Trans A 45, 3866–3875 (2014). https://doi.org/10.1007/s11661-014-2356-4
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DOI: https://doi.org/10.1007/s11661-014-2356-4