Diffusion of titanium in iron

Shapovalov, V. P.; Kurasov, A. N.

doi:10.1007/bf00703075

Cited by 18 publications

(12 citation statements)

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“…These elements were disregarded in the CALPHADs to minimize the complexity of calculations and improve the feasibility of obtaining reliable results from the calculated phase diagrams. All calculations were performed above 900 K. According to the diffusion coefficients of Nb 33 and Ti 34 in steel, it takes approximately 12 min and 14 s for Nb and Ti to diffuse 1 μm at 900°C (1173 K), respectively. Therefore, the correlation of calculated phase fractions to the heat treatment and thermomechanical processes should be made cautiously at low temperatures, where the kinetic of precipitation is a predominant factor.…”

Section: Resultsmentioning

confidence: 99%

Influence of microalloying elements (Ti, Nb) and nitrogen concentrations on precipitation of pipeline steels—A thermodynamic approach

Yamini

2020

Engineering Reports

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A CALculation of PHase Diagrams (CALPHAD) approach was used to study the precipitation of nitrides and carbonitrides in pipeline steels, aligned with new developments of complex chemical compositions and thermomechanical processing of High Strength Low Alloyed (HSLA) Steels. This is in response to growing demand for improved mechanical and chemical properties, manufacturing flexibility and reduced production cost. The calculated results indicated that the precipitation temperatures of nitrides in Ti‐Nb microalloyed steels increased by titanium concentration, while the niobium concentration significantly increased the precipitation temperature of niobium carbonitrides. Carbonitride precipitates formed at much lower temperatures (∼100 K) in low carbon steels (<0.03 wt%) than the high carbon steels (>0.1 wt%), suggesting precipitates larger in size. This is in good agreement with independent experimental data from the literatures, where austenite grain growth was studied in similar steel compositions. Although the dissolution and growth of precipitates are controlled kinetically, these results proved that the thermodynamic calculation can efficiently predict compositions and sequence of precipitation in chemically complex systems, guiding more accurate designs of experiments to identify critical temperatures of grain coarsening during reheating, recrystallisation during hot rolling, and transformation during cooling. This can minimize the number of tests required to obtain optimum chemical compositions and heat treatment procedures.

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Section: Resultsmentioning

confidence: 99%

Influence of microalloying elements (Ti, Nb) and nitrogen concentrations on precipitation of pipeline steels—A thermodynamic approach

Yamini

2020

Engineering Reports

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“…The results indicate that Ni and Ti showed much quicker aging response than Mo at the early aging stage. Considering the diffusion coefficients of the portioning elements (Ni, Ti, Mo, Fe) in the α-Fe matrix [ 27 , 28 , 29 ], the diffusivity of Mo is much lower than that of the other elements. This indicates that Mo acts as a kinetically controlling element for the precipitation process, as revealed by the fact that Mo is rejected from the precipitate into the matrix, accumulating before the Ni 3 Ti/matrix interface.…”

Section: Resultsmentioning

confidence: 99%

A New Maraging Stainless Steel with Excellent Strength–Toughness–Corrosion Synergy

et al. 2017

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A new maraging stainless steel with superior strength–toughness–corrosion synergy has been developed based on an innovative concept of alloy design. The high strength–toughness combination is achieved by forming dispersive nano-sized intermetallic compounds in the soft lath martensitic matrix with a slight amount of residual austenite. The good corrosion resistance is guaranteed by exactly controlling the Co content based on understanding the synergistic effect between Co and Cr. The fine structure characteristics of two dominant strengthening precipitations including Ni3Ti and Mo-rich phases were finely characterized associated with transmission electron microscope (TEM) and atom probe tomography (APT) analyses. The relationship among microstructure, strength and toughness is discussed. The precipitation mechanism of different precipitates in the new maraging stainless steel is revealed based on the APT analysis.

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“…As a result, a layer of material containing different amounts of titanium and iron with different depth of diffusion layers occurs. Different diffusion rates of Ti and Fe within each other produce intermetallic Ti x Fe y compounds with an irregular geometric shape as shown in Figure 6, zone 1, point C [20].…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

Pressure assisted bonding process of stainless steel on titanium alloy using powder metallurgy

Khoshnaw

Yamanoğlu

BAŞCI>

et al. 2021

Materials Chemistry and Physics

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Diffusion of titanium in iron

Cited by 18 publications

References 0 publications

Influence of microalloying elements (Ti, Nb) and nitrogen concentrations on precipitation of pipeline steels—A thermodynamic approach

Influence of microalloying elements (Ti, Nb) and nitrogen concentrations on precipitation of pipeline steels—A thermodynamic approach

A New Maraging Stainless Steel with Excellent Strength–Toughness–Corrosion Synergy

Pressure assisted bonding process of stainless steel on titanium alloy using powder metallurgy

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