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- W4364378519 endingPage "103612" @default.
- W4364378519 startingPage "103612" @default.
- W4364378519 abstract "This work aims at revealing the deformation mechanism of a newly developed Fe-18Ni-5Mo-2Cr-1.2Ti-0.6 V maraging steel with high strength and good ductility via in-situ synchrotron X-ray diffraction and transmission electron microscopy. High-density dislocation and nanometer-scaled precipitates were found in the lath martensite. Dislocation density decreased sharply in the as-solution-annealed steel (AS-steel), leading to massive austenite transformed into martensite on loading. Deformation results in massive dislocation proliferation, and lattice strain linear increase in aged steel (AG-steel). It was verified that even high dislocation density in AS-steel cannot be preserved after deformation due to the lack of pinning effect of dislocation slip. The plastic deformation of the crystals in AG-steel is attributed to the interaction between the nanometer-scaled Ni3(Ti, Mo) precipitates and the dislocations, obeying the Orowan mechanism. The pre-formed martensite in the AG-steel was transformed into a fresh orthogonal phase when the applied stress was above ∼876 MPa. The hard lath martensite can bear a higher level of applied stress during deformation; however, the lattice strain of austenite is much lower than that of martensite. Stress-induced martensitic transformation and dislocations proliferation were jointed to mediate the plastic deformation. And thus, the AG-steel exhibits a high work hardening rate, high strength of up to ∼1700 MPa, and an elongation of more than 11.7%." @default.
- W4364378519 created "2023-04-12" @default.
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- W4364378519 date "2023-06-01" @default.
- W4364378519 modified "2023-10-16" @default.
- W4364378519 title "Deformation mechanism of a strong and ductile maraging steel investigated using in-situ X-ray synchrotron diffraction" @default.
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- W4364378519 doi "https://doi.org/10.1016/j.ijplas.2023.103612" @default.
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