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Effect of Ni Addition on Bainite Transformation and Properties in a 2000 MPa Grade Ultrahigh Strength Bainitic Steel

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Abstract

The effects of Nickle (Ni) addition on bainitic transformation and property of ultrahigh strength bainitic steels are investigated by three austempering processes. The results indicate that Ni addition hinders the isothermal bainite transformation kinetics, and decreases the volume fraction of bainite due to the decrease of chemical driving force for nucleation and growth of bainite transformation. Moreover, the product of tensile strength and total elongation (PSE) of high carbon bainitic steels decreases with Ni addition at higher austempering temperatures (220 and 250 °C), while it shows no significant difference at lower austempering temperature (200 °C). For the same steel (Ni-free or Ni-added steel), the amounts of bainite and RA firstly increase and then decrease with the increase of the austempering temperature, resulting in the highest PSE in the sample austempered at temperature of 220 °C. In addition, the effects of austempering time on bainite amount and property of high carbon bainitic steels are also analyzed. It indicates that in a given transformation time range of 30 h, more volume of bainite and better mechanical property in high carbon bainitic steels can be obtained by increasing the isothermal transformation time.

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Abbreviations

RA:

Retained austenite

BS :

Bainite starting temperature

MS :

Martensite starting temperature

Ac3 :

Austenitization finishing temperature during heating

SEM:

Scanning electron microscope

XRD:

X-ray diffraction

M/A:

Martensite/austenite island

YS:

Yield strength

TS:

Tensile strength

TE:

Total elongation

PSE:

Product of the tensile strength and total elongation

CCT:

Continuous cooling transformation

TTT:

Time–temperature–transformation

TRIP:

Transformation induced plasticity

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Acknowledgements

The authors gratefully acknowledge the financial supports from the Major Projects of Technological Innovation in Hubei (No. 2017AAA116), the National Natural Science Foundation of China (No. 51274154) and the National Nature Science Foundation of China (No. 51704217).

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Correspondence to Guang Xu.

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Tian, J., Xu, G., Jiang, Z. et al. Effect of Ni Addition on Bainite Transformation and Properties in a 2000 MPa Grade Ultrahigh Strength Bainitic Steel. Met. Mater. Int. 24, 1202–1212 (2018). https://doi.org/10.1007/s12540-018-0139-y

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  • DOI: https://doi.org/10.1007/s12540-018-0139-y

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