Modeling of Grain Structure and Heat-Affected Zone in Laser Surface Melting Process

Jabbareh, Mohammad Amin; Assadi, H.

doi:10.1007/s11663-013-9834-8

Cited by 9 publications

(10 citation statements)

References 24 publications

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“…This is due to the choice of parameters used in the analytical model which were taken from Jabbareh and Assadi. 31 An appropriate set of parameters could be chosen to fit the FGHAZ data, but a single set of parameters cannot predict both sets of results. A modified grain growth model, along the lines of the two-term grain mobility, equation (7) would be expected to give an improved result, and is left for future work.…”

Section: Resultsmentioning

confidence: 99%

“…The value of Q s for austenite grain growth has been taken to be 53.9 kJ/mol, from Jabbareh and Assadi. 31 The calibrated values of k 0 and n (dimensionless) are 1.5 Â 10 À10 m n /s and 2.25, respectively. Note that Q in equation 7is not equal to Q s in the analytical grain growth model.…”

Section: Analytical Solution Of Austenite Grain Growth In Hazmentioning

confidence: 99%

“…Jabbareh and Assadi. 31 A widely used model comes from the classical relationship for isothermal grain growth, which can be used to simulate grain growth in the HAZ over discrete thermal cycles. In that case, each time step Δ t i is considered as an isothermal grain growth process and the overall growth is obtained from the integration over time.…”

Section: Modelling Frameworkmentioning

confidence: 99%

“…In that case, each time step Δ t i is considered as an isothermal grain growth process and the overall growth is obtained from the integration over time. The classical relationship of isothermal grain growth is expressed as 31 where d 0 and d are the initial and final mean grain diameter, respectively; k 0 is a kinetic constant; t is time at temperature T ; n is the time exponent and Q s is the activation energy for grain boundary movement. From equation (8), we can derive an explicit relationship for grain growth during welding as follows 31 …”

Section: Modelling Frameworkmentioning

confidence: 99%

See 3 more Smart Citations

Combined finite element and phase field method for simulation of austenite grain growth in the heat-affected zone of a martensitic steel weld

Shi

Alexandratos

O’Dowd

2018

Proceedings of the Institution of Mechanical Engineers, Part L:

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Engineering components operating at high temperature often fail due to the initiation and growth of cracks in the heataffected zone adjacent to a weld. Understanding the effects of microstructural evolution in the heat-affected zone is important in order to predict and control the final properties of welded joints. This study presents a combined finite element method and phase field method for simulation of austenite grain growth in the heat-affected zone of a tempered martensite (P91) steel weld. The finite element method is used to determine the thermal history of the heat-affected zone during gas tungsten arc welding of a P91 steel plate. Then, the calculated thermal history is included in a phase field model to simulate grain growth at various positions in the heat-affected zone. The predicted mean grain size and grain distribution match well with experimental data for simulated welds from the literature. The work lays the foundation for optimising the process parameters in welding of P91 and other ferritic/martensitic steels in order to control the final heat-affected zone microstructure.

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Section: Resultsmentioning

confidence: 99%

Section: Analytical Solution Of Austenite Grain Growth In Hazmentioning

confidence: 99%

Section: Modelling Frameworkmentioning

confidence: 99%

Section: Modelling Frameworkmentioning

confidence: 99%

See 2 more Smart Citations

Combined finite element and phase field method for simulation of austenite grain growth in the heat-affected zone of a martensitic steel weld

Shi

Alexandratos

O’Dowd

2018

Proceedings of the Institution of Mechanical Engineers, Part L:

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show abstract

“…Micro structure evolution during laser melting is also simulated by different researchers. Phase field modeling is chosen to simulate micro structure during laser melting by some researchers 19 20 . Although phase field modelling is an accurate model but this model is suffering from some points such as presently limited to qualitative simulation of a single dendrite or a very small calculation domain due to the large computational capacity needed.…”

mentioning

confidence: 99%

Determination and controlling of grain structure of metals after laser incidence: Theoretical approach

Dezfoli

Hwang

Huang

et al. 2017

Sci Rep

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There are serious questions about the grain structure of metals after laser melting and the ways that it can be controlled. In this regard, the current paper explains the grain structure of metals after laser melting using a new model based on combination of 3D finite element (FE) and cellular automaton (CA) models validated by experimental observation. Competitive grain growth, relation between heat flows and grain orientation and the effect of laser scanning speed on final micro structure are discussed with details. Grains structure after laser melting is founded to be columnar with a tilt angle toward the direction of the laser movement. Furthermore, this investigation shows that the grain orientation is a function of conduction heat flux at molten pool boundary. Moreover, using the secondary laser heat source (SLHS) as a new approach to control the grain structure during the laser melting is presented. The results proved that the grain structure can be controlled and improved significantly using SLHS. Using SLHS, the grain orientation and uniformity can be change easily. In fact, this method can help us to produce materials with different local mechanical properties during laser processing according to their application requirements.

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Monte Carlo simulation and experimental measurements of grain growth in the heat affected zone of 304 stainless steel during multipass welding

Chen

et al. 2015

Int J Adv Manuf Technol

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Modeling of Grain Structure and Heat-Affected Zone in Laser Surface Melting Process

Cited by 9 publications

References 24 publications

Combined finite element and phase field method for simulation of austenite grain growth in the heat-affected zone of a martensitic steel weld

Combined finite element and phase field method for simulation of austenite grain growth in the heat-affected zone of a martensitic steel weld

Determination and controlling of grain structure of metals after laser incidence: Theoretical approach

Monte Carlo simulation and experimental measurements of grain growth in the heat affected zone of 304 stainless steel during multipass welding

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