Stability of (Ti, M)C (M = Nb, V, Mo and W) carbide in steels using first-principles calculations

Jang, Jae Hoon; Lee, Chang‐Hoon; Heo, Yoon-Uk; Suh, Dong‐Woo

doi:10.1016/j.actamat.2011.09.051

Cited by 315 publications

(157 citation statements)

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“…(Ti, Mo)C is characteristic structural component that strongly influences mechanical and physical properties of material, as discussed by Chena et al [33] and Jang et al [34]. SEM microphotographs shown in Figure 5 present phases occurring after 1064 nm picosecond LSP, 10 mJ laser beam energy and pulse number of 100 (Figure 5a,b) and 50 (Figure 5c,d).…”

Section: Laser Shock Peening Of Nimonic 263 At 1064 Nm Wavelengthmentioning

confidence: 77%

“…These types of compounds are characterized by the irregular shape and micrometer scale dimensions [34]. In this case, the presence of TiMo carbides is undesirable because their presence can cause the crack formation in the material.…”

Section: Laser Shock Peening Of Nimonic 263 At 1064 Nm Wavelengthmentioning

confidence: 99%

“…The size of these carbides is up to 2 µm. At the grain boundaries the carbides are in the favorable form of chain, with higher hardness [34].…”

Section: Laser Shock Peening Of Nimonic 263 At 532 Nm Wavelengthmentioning

confidence: 99%

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Picosecond Laser Shock Peening of Nimonic 263 at 1064 nm and 532 nm Wavelength

Petronić

Šibalija

Burzić

et al. 2016

Metals

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Abstract:The paper presents a study on the surface modifications of nickel based superalloy Nimonic 263 induced by laser shock peening (LSP) process. The process was performed by Nd 3+ :Yttrium Aluminium Garnet (YAG) picosecond laser using the following parameters: pulse duration 170 ps; repetition rate 10 Hz; pulse numbers of 50, 100 and 200; and wavelength of 1064 nm (with pulse energy of 2 mJ, 10 mJ and 15 mJ) and 532 nm (with pulse energy of 25 mJ, 30 mJ and 35 mJ). The following response characteristics were analyzed: modified surface areas obtained by the laser/material interaction were observed by scanning electron microscopy; elemental composition of the modified surface was evaluated by energy-dispersive spectroscopy (EDS); and Vickers microhardness tests were performed. LSP processing at both 1064 nm and 532 nm wavelengths improved the surface structure and microhardness of a material. Surface morphology changes of the irradiated samples were determined and surface roughness was calculated. These investigations are intended to contribute to the study on the level of microstructure and mechanical properties improvements due to LSP process that operate in a picosecond regime. In particular, the effects of laser wavelength on the microstructural and mechanical changes of a material are studied in detail.

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Section: Laser Shock Peening Of Nimonic 263 At 1064 Nm Wavelengthmentioning

confidence: 77%

Section: Laser Shock Peening Of Nimonic 263 At 1064 Nm Wavelengthmentioning

confidence: 99%

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Picosecond Laser Shock Peening of Nimonic 263 at 1064 nm and 532 nm Wavelength

Petronić

Šibalija

Burzić

et al. 2016

Metals

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“…In the second and the third model, the growth rate is assumed to be controlled by a combination of volume diffusion and diffusion along dislocations. We use the tracer diffusivity of 44 Ti, as measured in large single Fe crystals, 38) as the lattice diffusivity of Ti in martensite, for all three models. The diffusivity data of Ti in α-iron, as measured by Moll and Ogilvie 39) is not used for the calculations as this data is derived from polycrystalline materials, which is believed to overestimate the lattice diffusivity.…”

Section: Diffusional Tic-precipitate Growthmentioning

confidence: 99%

“…0.3 J/m 2 ). 21,44,45) The numerical calculation of the TiC-precipitate radius is done according to:…”

Section: Volume-diffusion Growthmentioning

confidence: 99%

Effect of Ti on Evolution of Microstructure and Hardness of Martensitic Fe–C–Mn Steel during Tempering

et al. 2014

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The effect of the addition of 0.042 wt.% of titanium on the relation between the evolution of the microstructure and the softening kinetics of quenched martensite in high-purity Fe-C-Mn steel has been studied during tempering at 300 and 550°C. The evolution of the microstructure is characterized by measuring the cementite particle size, the martensite block size, the area fraction of martensite regions which contain a high dislocation density, the macroscopic hardness, the nano-hardness of martensite blocks boundaries, the nano-hardness of the matrix and the TiC-precipitate size during tempering. Nucleation of TiC-precipitates take place during annealing at 550°C and starts earlier in regions close to the block boundaries, after 5-10 minutes, and thereafter in the matrix, after 10-30 minutes, due to the higher dislocation density in the regions close to the block boundaries. The TiC-precipitates slow down the recovery in regions of high dislocation density compared to the alloy without TiC-precipitates. The TiC-precipitates increase the macroscopic hardness of the steel after 30 minutes annealing at 550°C. The growth of TiC-precipitates in martensite is simulated in good agreement with experimental observations by a model that takes into account: 1) capillarity effects, 2) the overlap of the titanium diffusion fields between TiC-precipitates, and 3) the effect of pipe diffusion of titanium atoms via multiple dislocations. The average, experimentallyobserved, TiC-precipitate size is 69 ± 48 Ti atoms.

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