Age hardening and mechanical properties of a 2400 MPa grade cobalt-free maraging steel |
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| Authors: | Yi He Ph.D. Ke Yang Kai Liu Ph.D. Wei Sha Zhanli Guo |
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| Affiliation: | (1) Institute of Metal Research, Chinese Academy of Sciences, 110016 Shenyang, People’s Republic of China;(2) Present address: Laboratory of Materials Science, Delft University of Technology, 2628 AL Delft, The Netherlands;(3) the Institute of Metal Research, Chinese Academy of Sciences, 110016 Shenyang, People’s Republic of China;(4) Metals Research Group, School of Planning, Architecture and Civil Engineering, The Queen’s University of Belfast, BT7 1NN Belfast, U.K.;(5) Surrey Technology Centre, Materials Scientist, is with Sente Software Ltd., GU2 7YG Guildford, U.K. |
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| Abstract: | The age hardening kinetics in the temperature range of 713 to 813 K of a 2400 MPa grade cobalt-free maraging steel (Fe-(18.8 ∼ 19.1) pct Ni-(4.4 ∼ 5.4) pct Mo-2.6 pct Ti, wt pct) has been studied. Study of microstructure and mechanical properties showed that a high number of Ni3Ti and Fe2(Mo,Ti) precipitates were formed during the ageing process, which resulted in high strength and relatively low fracture toughness. Ni3Ti was the main precipitation phase. Fractography has shown ductile failure of tensile and fracture toughness specimens. Thermodynamic calculations showed that the equilibrium phases are Ni3Ti, Fe2(Mo,Ti), ferrite, and austenite. |
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