# Martensite decomposition kinetics in additively manufactured Ti-6Al-4V alloy: in-situ characterisation and phase-field modelling

Source: [Martensite decomposition kinetics in additively manufactured Ti-6Al-4V alloy: in-situ characterisation and phase-field modelling](<https://www.sota2.com/research/paper/68fa46d21e209131ce923586>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-25T06:00:08.619Z

Authors: A.D. Boccardo, Z. Zou, M. Simonelli, M. Tong, J. Segurado, S.B. Leen, D. Tourret

Published: 2024-04-15T14:02:48.000Z

## Abstract

Additive manufacturing of Ti-6Al-4V alloy via laser powder-bed fusion leads to non-equilibrium $\\alpha'$ martensitic microstructures, with high strength but poor ductility and toughness. These properties may be modified by heat treatments, whereby the $\\alpha'$ phase decomposes into equilibrium $\\alpha+\\beta$ structures, while possibly conserving microstructural features and length scales of the $\\alpha'$ lath structure. Here, we combine experimental and computational methods to explore the kinetics of martensite decomposition. Experiments rely on in-situ characterisation (electron microscopy and diffraction) during multi-step heat treatment from 400$^{\\circ}$C up to the alloy $\\beta$-transus temperature (995$^{\\circ}$C). Computational simulations rely on an experimentally-informed computationally-efficient phase-field model. Experiments confirmed that as-built microstructures were fully composed of martensitic $\\alpha'$ laths. During martensite decomposition, nucleation of the $\\beta$ phase occurs primarily along $\\alpha'$ lath boundaries, with traces of $\\beta$ nucleation along crystalline defects. Phase-field results, using electron backscatter diffraction maps of as-built microstructures as initial conditions, are compared directly with in-situ characterisation data. Experiments and simulations confirmed that, while full decomposition into stable $\\alpha+\\beta$ phases may be complete at 650$^{\\circ}$C provided sufficient annealing time, visible morphological evolution of the microstructure was only observed for $T\\geq\\,$700$^{\\circ}$C, without modification of the prior-$\\beta$ grain structure.

## Recorded benchmark results

A research result applies to its stated dataset, split, metric and evaluation configuration. Compare like-for-like settings, preserve the metric's unit and direction, and distinguish paper-reported results from independent reproduction. The best result recorded here is not a claim of exhaustive, current global coverage.

## Original sources and implementation

[Original paper](<https://arxiv.org/abs/2404.09806>)

[PDF](<https://arxiv.org/pdf/2404.09806.pdf>)