Quantitative interpretation of martensite microstructure

Guimarães, J.R.C.; Rios, Paulo Rangel

doi:10.1590/s1516-14392011005000005

Cited by 8 publications

(4 citation statements)

References 20 publications

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“…It results from the way of passing stress (through the grain boundaries) caused by the greater specific volume of martensite in relation to austenite. Accordingly, it can be stated that the greater degree of heterogeneity of crystallographic orientation variants of the formed martensite corresponds to a larger number of initial nuclei [8][9][10]. A characteristic feature of martensite created in this way is the three-level hierarchy of morphology, consisting of laths, blocks, and packets.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Austenite Grain Size on the Mechanical Properties of Low-Alloy Steel with Boron

Białobrzeska

Konat

Jasiński

2017

Metals

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This study forms part of the current research on modern steel groups with higher resistance to abrasive wear. In order to reduce the intensity of wear processes, and also to minimize their impact, the immediate priority seems to be a search for a correlation between the chemical composition and structure of these materials and their properties. In this paper, the correlation between prior austenite grain size, martensite packets and the mechanical properties were researched. The growth of austenite grains is an important factor in the analysis of the microstructure, as the grain size has an effect on the kinetics of phase transformation. The microstructure, however, is closely related to the mechanical properties of the material such as yield strength, tensile strength, elongation and impact strength, as well as morphology of occurred fracture. During the study, the mechanical properties were tested and a tendency to brittle fracture was analysed. The studies show big differences of the analysed parameters depending on the applied heat treatment, which should provide guidance to users to specific applications of this type of steel.

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Section: Introductionmentioning

confidence: 99%

The Influence of Austenite Grain Size on the Mechanical Properties of Low-Alloy Steel with Boron

Białobrzeska

Konat

Jasiński

2017

Metals

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“…The stability of untransformed austenite after the final quenching to room temperature is strongly related to the distribution of carbon concentration in microstructures after the partitioning step, which is also closely related to process parameters, such as partitioning temperature and time [25]. Thus, the proposed phase field modeling in this study derives a reasonable distribution of carbon concentration during microstructural evolution for Q&P processes.…”

Section: Transformation Behaviors and Carbon Redistribution During Pa...mentioning

confidence: 85%

“…Takahama and Mecozzi et al [23,24] attempted to simulate carbon redistribution and microstructural evolution in the partitioning step with a modified phase field model, different paths for carbon partitioning and corresponding diffusion-controlled interface migration were predicted in their simulations. However, there is a clear gap between simulation results by their phase field model and the real martensitic transformation behavior, such as the process of nucleation and growth for martensite, due to the ignoring of elastic strain energy in model [25]. Recently, Amos et al [26] adopted a phase field micorelasticity model to simulate athermal martensitic transformation during the quenching step, the subsequent carbon redistribution process in partitioning was also predicted with the constrained carbon equilibrium (CCE) model.…”

Section: Introductionmentioning

confidence: 99%

Analysis of interface migration and isothermal martensite formation for quenching and partitioning process in a low-carbon steel by phase field modeling

Zhang¹,

Shen²,

Li³

et al. 2019

Modelling Simul. Mater. Sci. Eng.

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A modified two-dimensional phase field microelasticity model coupling the Cahn–Hillard equation is applied to investigate the microstructural evolution of interface migration and isothermal martensitic transformation accompanying carbon diffusion and redistribution during quenching and partitioning (Q&P) process in a low-carbon steel. In the modeling, the Kim–Kim–Suzuki model is adopted to depict interface conditions for carbon diffusion, while the transformation behavior during partitioning is assumed as a displacive manner. Simulations were done for one-step Q&P processes with various partitioning temperatures. Simulated results reveal that carbon enrichment within untransformed austenite varies significantly with the local microstructural features formed during Q&P process. With the proposed phase field model, the isothermal martensite formation and migration of existing austenite–martensite interfaces during partitioning are realized by simulation. It is also revealed that the interface migration behavior during partitioning is strongly correlated with the spatial distribution of the local elastic strain energy inherited from quenching process. Furthermore, temperature dependence of isothermal martensitic transformation kinetics is also studied, with the competition between martensitic transformation and reverse transformation during partitioning, a favorable partitioning temperature is found to have the maximum amount of isothermal martensite formed during partitioning.

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“…It is a single-phase interface, with crystals on each side of the boundary being identical, except in orientation. It is generally accepted that the grain boundaries are impervious to martensite propagation in a polycrystalline material [27][28][29]. Since the martensitic transformation is a displacive transformation accomplished by the cooperative atomic movements, it is disrupted at the boundaries between regions of the matrix with different orientations, i.e.…”

Section: Polycrystal Model and The Effect Of The Grain Boundarymentioning

confidence: 99%

Phase-field modelling of martensitic transformation: the effects of grain and twin boundaries

Malik

Amberg

Borgenstam

et al. 2013

Modelling Simul. Mater. Sci. Eng.

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In this work, we present the non-linear elasto-plastic phase-field model and simulation of the martensitic transformation in a polycrystalline material including the effects of grain and twin boundaries. The phase-field microelasticity theory proposed by Khachaturyan is used to perform 2D and 3D simulations of fcc → bct martensitic transformation in a Fe–0.3%C polycrystalline alloy, incorporating the effect of both coherent and incoherent boundaries. The effect of plastic accommodation is also introduced into the model, by solving a time-dependent equation, during the solid-to-solid phase transformation. It is found that the given phase-field model, with the effect of grain boundaries, not only respects the morphological features of martensite but also conforms well with the physics of the problem. Different sets of simulations are performed to validate the model and it is concluded that the given model can correctly predict the evolution of the martensitic microstructure in a polycrystal, as opposed to previous models where the effects of grain and twin boundaries are neglected.

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Quantitative interpretation of martensite microstructure

Cited by 8 publications

References 20 publications

The Influence of Austenite Grain Size on the Mechanical Properties of Low-Alloy Steel with Boron

The Influence of Austenite Grain Size on the Mechanical Properties of Low-Alloy Steel with Boron

Analysis of interface migration and isothermal martensite formation for quenching and partitioning process in a low-carbon steel by phase field modeling

Phase-field modelling of martensitic transformation: the effects of grain and twin boundaries

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