Void initiation at TiN precipitates in IF steels during tensile deformation

León-García, Orlando; Petrov, Roumen; Kestens, Léo

doi:10.1016/j.msea.2010.03.071

Cited by 36 publications

(16 citation statements)

References 23 publications

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“…In the process of TiN formation, nonmetallic inclusions in molten steel, such as MnS, Al 2 O 3 , and MgO, are high-temperature stable phases that provide nonuniform nucleation sites for TiN formation. The size of such TiN inclusions is slightly larger than that of the ordinary inclusions [10,13,14], which are shown in figure 6(d). Figure 7 shows that the average size of nearly 200 inclusion particles is approximately 3.5 μm.…”

Section: Tin Inclusions In the 20crmnti Steelmentioning

confidence: 90%

“…TiN particles clearly cause cleavage fracture in both ferritic-pearlite steel [8][9][10][11] and bainitic steel [12]. Most TiN particles are regular squares with sharp edges and easily nucleate and grow into larger particles near nonmetallic inclusions [11,13,14] (e.g., MnS, Al 2 O 3 , MgO, etc). The greater the size and quantity of these hard particles, the worse the toughness of the material.…”

Section: Introductionmentioning

confidence: 99%

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The effect of TiN inclusions on the fracture mechanism of 20CrMnTi steel with lath martensite

Zhu¹,

Lu²,

Huang³

et al. 2020

Mater. Res. Express

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This study aims to investigate the effect of TiN inclusions on the fracture mechanism of 20CrMnTi steel with martensite. Size of martensite packets, blocks and TiN inclusions were characterized, and the room-temperature tensile properties, impact toughness and fracture toughness were tested of 20CrMnTi steel quenched at different temperatures. The effects of TiN inclusions on the impact toughness and fracture toughness were investigated according to the Hall-Petch relationship. The results show that, TiN inclusions are high temperature stable phases which insoluble to the matrix, mostly squared in shape and dispersed. The impact toughness and fracture toughness of 20CrMnTi steel decrease with increasing sizes of the initial austenite grains, martensite packets and blocks as the quenching temperature increases. Interestingly, the TiN inclusions strongly affect the toughness of the 20CrMnTi steel in the fracture and the fine-grained sample has a better toughness. Under high-stress concentrations, TiN inclusion particles can initiate cleavage cracking.

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Section: Tin Inclusions In the 20crmnti Steelmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

The effect of TiN inclusions on the fracture mechanism of 20CrMnTi steel with lath martensite

Zhu¹,

Lu²,

Huang³

et al. 2020

Mater. Res. Express

View full text Add to dashboard Cite

show abstract

“…Both mechanisms can occur at the same particle, see e.g. [47]. Obviously, this void nucleation mechanism requires the presence of second-phase particles.…”

Section: Fracturementioning

confidence: 99%

“…Accordingly, the effect of precipitates on ductile fracture is negligible as their average diameter is one order of magnitude smaller than that of the dispersoids and two orders smaller than that of the constituents. However, the work of León-Garcí et al [47] suggests that if larger particles are absent, as in the case of IF steels, then precipitates become relevant for ductile fracture.…”

Section: Fracturementioning

confidence: 99%

Modelling of ductile failure in aluminium sheet forming simulation

et al. 2011

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In the present article novel approaches to account for localized necking, post-necking and ductile fracture in the numerical simulation of aluminium sheet forming are presented. The modelling concept was implemented in a commercial finite element software and is applied to an aluminium alloy sheet subjected to different forming operations. A validation of the simulation results by means of experiments is employed. It is shown that the proposed modelling framework is capable of accurately predicting the experimental results.

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“…The welding peak temperature especially at the tool/workpiece contact region is expected to be higher than the melting temperature of Zn and thus the possibility of Zn present in the stirred zone (SZ) should be low. Beak et al 2010 [174] explained the existence of Zn in the stirred zone as a result of the FSW tool effect, whereby…”

Section: Segregation/precipitation Analysis Using Sem-eds To Identifymentioning

confidence: 99%

A mathematical and experimental analysis of friction stir welding of steel

Al-moussawi¹

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In the last decade there has been significant research into joining steel alloys using the Friction Stir Welding technique due to its ability to carry out welding below the melting point of the parent material and without using fillers such as in fusion welding techniques. This coincided with the increased use of DH36 and EH46 steel grades for ship building. The main reason for joining these steel grades by the friction stir welding technique is to reduce the weight of the vessel, as well as, the high welded joint quality especially mechanical properties such as fatigue and impact resistance. Other improved physical characteristics include increased tensile strength, microhardness and surface finish. This research project has attempted to model friction stir welding using Computational Fluid Dynamics (CFD). Three different approaches have been used when considering the interface between the tool and the workpiece; these are torque, sticking/slipping and fully sticking. The project also investigates the mechanical properties of the welded joints including tensile, fatigue and microhardness. The microstructural evolution of welded joints carried out using different welding parameters is also investigated. The phenomenon of elemental precipitation/segregation during the friction stir welding process has been investigated and the limit of tool rotational speed at which the segregation occurs has been determined by modelling and also by heat treatment to simulate FSW. The purpose of the heat treatment trials was to attempt to replicate the temperature and time that the parent materials experiences during the FSW process. Defects in the weld joints associated with unsuitable friction stir welding parameters were also investigated and two new types of defect have been identified for the first time. Finally, tool wear has been investigated in the different weld joints in order to understand the suitable welding parameters that can prolong tool life. IV Project Outcomes and Cooperation The following journal and conference papers have been published as part of the project outcomes. Conference Presentations.

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Void initiation at TiN precipitates in IF steels during tensile deformation

Cited by 36 publications

References 23 publications

The effect of TiN inclusions on the fracture mechanism of 20CrMnTi steel with lath martensite

The effect of TiN inclusions on the fracture mechanism of 20CrMnTi steel with lath martensite

Modelling of ductile failure in aluminium sheet forming simulation

A mathematical and experimental analysis of friction stir welding of steel

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