Acoustic Emission During Austenite → ε Martensitic Phase Transformation in TWIP/TRIP Steels

Bolgár, M.K.; Nagy, É.; Daróczi, Lajos; Benke, Márton; Mertinger, Valéria; Beke, Dezső L.

doi:10.1007/s11661-019-05291-0

Cited by 9 publications

(6 citation statements)

References 26 publications

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“…In contemporary publications, research on acoustic emission signals is based on the analysis of above-average signals and on the analysis of AE events [ 16 ]. Therefore, the start of the phase transformation was defined as a 20% steady-state increase in the acoustic emission event compared to the steady-state value.…”

Section: Resultsmentioning

confidence: 99%

Analysis of the Degradation of Pearlitic Steel Mechanical Properties Depending on the Stability of the Structural Phases

et al. 2023

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The paper is focused on analysing the pearlitic steel phase transformations and their influence on the mechanical properties. The intention is to perform a detailed analysis of the heat treatment process using the exact heating temperature and chemical composition to achieve the optimal mechanical properties of the tool. The key area is monitoring and regulating the heat treatment. This technology is constantly undergoing an optimisation process and is an effort to introduce new trends in monitoring phase transformations and processes. The use of non-destructive methods is an adequate tool. The principle is to determine the exact structural phase at a given moment, which can be very difficult when a complex shaped part is heat treated. Which precludes the use of some other methods of phase transformation analysis. Specifically, the determination of the exact moment of finish of the austenitisation process is eminent. The monitoring of these processes will be ensured by both a non-contact pyrometer and also by the AE method with an adequate sensor and waveguide. The resulting structural phases formed after the heat treatment will be evaluated by electron microscopy, followed by the analysis of the mechanical properties of selected steels.

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Section: Resultsmentioning

confidence: 99%

Analysis of the Degradation of Pearlitic Steel Mechanical Properties Depending on the Stability of the Structural Phases

et al. 2023

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“…On the other hand, by modifying the focal level and the laser power to 2 and −2, respectively, the expected HV near the surface cannot be reached as shown in Figure 8c. This effect may be attributed to the amount of incoming heat, which is confined enough near the surface level to induce the α -phase transformation in agreement with [1,35]. Furthermore, at low laser power and high focal distance position, a larger spot diameter on the surface is created.…”

Section: Superficial Hardness Evolutionmentioning

confidence: 88%

Exploring the Effects of Laser Surface Modification on AISI 301LN Steel: A Micro-Mechanical Study

Rezayat,

Mateo,

Roa

2023

JMMP

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This article investigates the surface hardening capability of a metastable austenitic TRansformation Induced Plasticity (TRIP) stainless steel, particularly on AISI 301LN, by laser texturing. This technology produces microstructural surface changes in terms of both phase transformation and grain size modification and, as a direct consequence, the laser influences the surface characteristics, mainly hardness and roughness. In this sense, the key parameters (laser power, scanning speed and position of the focal length) were investigated by using a Design of Experiments (DoE) in detail to better understand the correlation between texturing parameters, microstructural and mechanical changes, always at the superficial level. From all the aforementioned information, the results show that the maximum surface hardening is obtained by increasing the laser power and decreasing the scanning speed. Furthermore, by reducing the focal distance, the depth of the microstructural evolution layer is more significant, while the width is less affected. Finally, a suitable model was developed to correlate the processing parameters here investigated with the resulting surface integrity, in terms of mechanical properties, by means of a regression equation.

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“…This diversity not only contributes to their remarkable strength but also confers these materials' noteworthy ductility [6,7]. The martensitic phase transformation, characterized by a rapid and diffusionless nature, has captivated researchers for over a century and continues as a subject of profound interest and investigation [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Effect of Laser Surface Texturing on Schmid Factor and Plastic Deformation Mechanisms on AISI 301LN Steel

Rezayat,

Roa,

Mateo

2023

Metals

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In this comprehensive study, the multifaceted impact of laser surface texturing (LST) on AISI 301LN stainless steel is explored. Changes in the microstructure, mechanical properties, and grain characteristics are examined. The dynamic relationship between Schmid factor evolution and plastic deformation in this stainless steel alloy is unveiled through the analysis of grain statistics and individual grain scrutiny. It is revealed that LST initiates the formation of strain-induced α’-martensite, grain refinement, and substantial hardness enhancements. Notably, an α’-martensite crystalline size of 2.05 Å is induced by LST. Furthermore, a 12% increase in tensile strength is observed after LST along with an 11% boost in yield strength. However, reductions of 19% in elongation to fracture and 12% in the area reduction are experienced.

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Acoustic Emission During Austenite → ε Martensitic Phase Transformation in TWIP/TRIP Steels

Cited by 9 publications

References 26 publications

Analysis of the Degradation of Pearlitic Steel Mechanical Properties Depending on the Stability of the Structural Phases

Analysis of the Degradation of Pearlitic Steel Mechanical Properties Depending on the Stability of the Structural Phases

Exploring the Effects of Laser Surface Modification on AISI 301LN Steel: A Micro-Mechanical Study

Effect of Laser Surface Texturing on Schmid Factor and Plastic Deformation Mechanisms on AISI 301LN Steel

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