In-situ measurement of α formation kinetics in a metastable β Ti-5553 alloy using laser ultrasonics

Rodrigues, Mariana Carla Mendes; Garcin, Thomas; Militzer, Matthias

doi:10.1016/j.jallcom.2021.158954

Cited by 17 publications

(4 citation statements)

References 49 publications

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“…Only a few studies have been conducted for steels to validate the quantitative relationship between the fraction transformed from LUS and the phase fraction using post-mortem characterization, whereas some studies have been reported for titanium alloys 14,15) . The primary goal of the present study is to assess the in-situ monitoring capability of LUS for ferrite formation in hot-rolled DP steels during laboratory simulation of stepped run-out table cooling including validation of the LUS measurements with ex-situ metallography.…”

Section: Introductionmentioning

confidence: 99%

<i>In-situ</i> Laser Ultrasonics Measurements of Ferrite Formation during Stepped Cooling of A 0.1C-2Mn Dual Phase Steel

Hayashi,

Rodrigues,

Militzer

2024

ISIJ Int.

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Dual-phase (DP) steels are advanced high-strength steels used in automotive design. To achieve optimal mechanical properties the control of phase transformations during processing is paramount, e.g. for hot-rolled DP steels a desired ferrite fraction is required to form during run-out table cooling. Thus, sensor technologies such as laser ultrasonics (LUS) are of considerable interest that can in-situ monitor ferrite formation. In this study, the ferrite formation kinetics in a laboratory DP steel were measured by LUS during stepped cooling treatments which were designed to simulate the cooling paths on the run-out table in hot strip mills. LUS measurements were first validated with well-established dilatometry measurements during continuous cooling. For the stepped cooling tests, the fractions transformed obtained from the ultrasonic velocity changes agree with the ferrite phase fractions as characterized by ex-situ metallography. Further, the velocity changes are described by the JMAK approach using parameters that are consistent for the austenite-toferrite transformation in low-carbon steels.

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Section: Introductionmentioning

confidence: 99%

<i>In-situ</i> Laser Ultrasonics Measurements of Ferrite Formation during Stepped Cooling of A 0.1C-2Mn Dual Phase Steel

Hayashi,

Rodrigues,

Militzer

2024

ISIJ Int.

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“…This inspired a wide range of applications in the evaluation of elastic moduli, texture, grain growth, recrystallization, and phase transformation, etc. [3][4][5][6]. The present work aims to further advance the experimental design for LUMet measurements of austenite grain growth, recrystallization, and decomposition on selected microalloyed steels such that continuous in situ measurements of microstructure evolution can be performed in conditions that simulate industrial thermo-mechanical schedules.…”

Section: Introductionmentioning

confidence: 99%

In situ measurement of austenite grain growth and recrystallization using laser ultrasonics

Lin,

Roy,

Militzer

2023

J. Phys.: Conf. Ser.

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The development of next generation process models and advanced high-strength steel products for thin slab casting and direct rolling requires quantification of microstructure evolution during thermomechanical processing. Laser ultrasonics is a non-contact in-situ method to record grain growth, recrystallization and phase transformations in metals and alloys. Here, we will present an improved experimental design that facilitates a continuous microstructure measurement through the various stages of simulated hot rolling from reheating to runout table cooling using a Gleeble thermomechanical simulator equipped with a laser ultrasonics for metallurgy (LUMet) system. Austenite grain growth and static recrystallization after hot deformation are quantified based on attenuation of the ultrasound waves whereas austenite decomposition can be recorded with the changes in ultrasound velocity during the phase transformation. Further, the LUMet results for a microalloyed low carbon steel are validated with conventional techniques including optical and electron microscopy as well as double-hit tests. These experimental studies demonstrate the capabilities of laser ultrasonics in the identification of both normal and abnormal grain growth, non-recrystallization temperature, recrystallization, and austenite decomposition kinetics in a single test for a given processing path, as well as its potential for accelerated optimization of process control under industrial rolling conditions.

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“…These precipitations act as strengthening phases and can increase, depending on their size, shape and distribution, the mechanical strength significantly [15]. In the case of conventionally and AM-produced Ti-5553, quenching during the manufacturing process or a subsequent heat treatment can lead to the formation of the strength-reducing omega phase [16][17][18][19]. This can be excluded in the present work due to the prevailing process temperatures and the associated slow cooling rate [13,20].…”

Section: Introductionmentioning

confidence: 99%

In Situ CT Tensile Testing of an Additively Manufactured and Heat-Treated Metastable ß-Titanium Alloy (Ti-5Al-5Mo-5V-3Cr)

et al. 2021

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Additive manufacturing has been considered a suitable process for developing high-performance parts of medical or aerospace industries. The electron beam powder bed fusion process, EB‑PBF, is a powder bed fusion process carried out in a vacuum, in which the parts are melted using a highly focused electron beam. The material class of metastable β‑titanium alloys, and especially Ti‑5Al‑5Mo‑5V‑3Cr, show great potential for use as small and highly complex load-bearing parts. Specimens were additively manufactured with optimised process parameters and different heat treatments used in order to create tailored mechanical properties. These heat-treated specimens were analysed with regard to their microstructure (SEM) and their mechanical strength (tensile testing). Furthermore, in situ tensile tests, using a Deben CT5000 and a YXLON ff35 industrial µ‑CT, were performed and failure‑critical defects were detected, analysed and monitored. Experimental results indicate that, if EB‑PBF-manufactured Ti‑5553 is heat-treated differently, a variety of mechanical properties are possible. Regarding their fracture mechanisms, failure-critical defects can be detected at different stages of the tensile test and defect growth behaviour can be analysed.

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In-situ measurement of α formation kinetics in a metastable β Ti-5553 alloy using laser ultrasonics

Cited by 17 publications

References 49 publications

<i>In-situ</i> Laser Ultrasonics Measurements of Ferrite Formation during Stepped Cooling of A 0.1C-2Mn Dual Phase Steel

<i>In-situ</i> Laser Ultrasonics Measurements of Ferrite Formation during Stepped Cooling of A 0.1C-2Mn Dual Phase Steel

In situ measurement of austenite grain growth and recrystallization using laser ultrasonics

In Situ CT Tensile Testing of an Additively Manufactured and Heat-Treated Metastable ß-Titanium Alloy (Ti-5Al-5Mo-5V-3Cr)

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