Solute-dislocation interactions and creep-enhanced Cu precipitation in a novel ferritic-martensitic steel

Xiao, Bo; Xu, Lianyong; Cayron, Cyril; Xue, Junqing; Sha, Gang; Logé, Roland E.

doi:10.1016/j.actamat.2020.05.054

Cited by 71 publications

(14 citation statements)

References 43 publications

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“…The dislocations density inside the lath increases significantly, forming dislocation cells and dislocation entanglements, which provides favorable conditions for the formation of martensite. [ 31,32 ] The high‐density dislocations between the slats have become the main mechanism of hardness strengthening of 45 steel, which is consistent with the results calculated by the Williamson dislocation density formula. Finally, with the further increase in cooling rate and the promotion of martensite nucleation by dislocations, lath martensite is further refined, forming parallel equiaxed fine lath martensite as shown in Figure 8d.…”

Section: Resultssupporting

confidence: 85%

Effect of Microstructure on Hardness and Wear Properties of 45 Steel after Induction Hardening

Cao

Liu

et al. 2021

steel research int.

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Herein, the mechanical properties and microstructural evolution of 45 steel subjected to induction hardening (IH) is studied. To study the strengthening mechanism of IH on the 45 steel, the flow rate (FL) with 50, 60, and 70 L min−1 are chosen to cool the samples. The hardness distribution in the near‐surface layer is measured by a CARAT 930 Vickers hardness tester. The metallographic structures of the 45 steel with and without IH are analyzed by optical microscope (OM) and transmission electron microscopy (TEM). The phase analysis in the surface layer is determined by X‐ray diffraction (XRD). Combined with OM and hardness distribution, the results indicate that bainite is the reason for the low hardness of the raw material. Also the wear mechanism of 45 steel changes from adhesive wear and delamination to abrasive wear. Moreover, when FL increases from 50 to 70 L min−1, the surface hardness of 45 steel raises by 19.86% and the coefficient of friction reduces from 0.122 to 0.0418. Combined with TEM analysis, the determinate factors of surface hardness and tribological characteristics owes to martensite grain refinement, during the process of transforming austenite to martensite. Dislocations provide conditions for martensite nucleation, the driving force of the phase change generated by thermal deformation and FL drop provides energy for martensite nucleation.

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Section: Resultssupporting

confidence: 85%

Effect of Microstructure on Hardness and Wear Properties of 45 Steel after Induction Hardening

Cao

Liu

et al. 2021

steel research int.

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“…Besides the Laves phase, copper-rich precipitates containing Fe, Cu, Cr, and C can be observed in the vicinity of the fracture surface. Xiao et al [38] discussed solute-dislocation interactions and creep-enhanced Cu-rich precipitate (CRPs) evolution in a novel ferritic-martensitic steel G115 during creep. And the large precipitates may nucleate microvoids which results into final fracture.…”

Section: Creep Resistance Analysis In Weld Metalmentioning

confidence: 99%

Creep Rupture Behavior in Dissimilar Weldment between FB2 and 30Cr1Mo1V Heat-Resistant Steel

Xiong

Yang

Zhao

et al. 2021

International Journal of Photoenergy

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Creep rupture behavior of dissimilar weldments between FB2 and 30Cr1Mo1V heat-resistant steel by multipass welding at 783 K (510°C) under different stresses (260 to 420 MPa) was researched. The fitted creep rupture exponent is 14.53, and the 10,000 h extrapolating strength values predicted by the power law and Larson-Miller parameter show good agreement with experimental data. The samples exhibit a ductile fracture character and fracture in the weld fusion zone, which has a highly heterogeneous microstructure and grains with different morphologies and sizes and an obvious softening. There exist a decrease in the dislocation and precipitate density and an increase in the subgrain size in the weld metal after creep. The rupture is a transgranular fracture characterized by dimples as a result of microvoid coalescence. Laves phases along with copper-rich precipitates are observed in the vicinity of fracture surface, which creates a stress concentration that can cause transgranular fracture initiation.

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“…TKD has a significantly higher spatial resolution than the conventional EBSD [39]. TKD was widely applied in crystal ORs determination and phase mapping on a nanoscale in recent years [40][41][42].…”

Section: Pole Figuresmentioning

confidence: 99%

Study on Phase Transformation Orientation Relationship of HCP-FCC during Rolling of High Purity Titanium

et al. 2021

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High purity titanium (Ti) thin strip was prepared by rolling with large deformation and was characterized by the means of Transmission Electron Microscopy (TEM), selected area diffraction (SAED) pattern, high-resolution (HRTEM) analysis, as well as Transmission Kikuchi Diffraction (TKD). It is found that there are face-centered cubic (FCC) Ti laths formed within the matrix of hexagonal close packing (HCP) Ti. This shows that the HCP-FCC phase transition occurred during the rolling, and a specific orientation relationship (OR) between HCP phase and FCC phase obeys ⟨0001⟩α// ⟨001⟩FCC and {100}α//{110}FCC. The ORs of HCP-FCC phase transition are deeply studied by TKD pole figure and phase transformation matrix. It is found that the derived results via pole figure and transformation matrix are equivalent, and are consistent with TEM-SAED analysis results, which proves that these two methods can effectively characterize the ORs of HCP-FCC phase transition and predict possible FCC phase variants.

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Solute-dislocation interactions and creep-enhanced Cu precipitation in a novel ferritic-martensitic steel

Cited by 71 publications

References 43 publications

Effect of Microstructure on Hardness and Wear Properties of 45 Steel after Induction Hardening

Effect of Microstructure on Hardness and Wear Properties of 45 Steel after Induction Hardening

Creep Rupture Behavior in Dissimilar Weldment between FB2 and 30Cr1Mo1V Heat-Resistant Steel

Study on Phase Transformation Orientation Relationship of HCP-FCC during Rolling of High Purity Titanium

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