Correlation between Martensitic Phase Transformation and Magnetic Barkhausen Noise of AISI 304 Steel

Astudillo, Miriam Rocío Neyra; Nicolás, Marcelo Núñez; Ruzzante, José; Gómez, M.; Ferrari, Guido; Padovese, Linilson Rodrigues; Pumarega, María Isabel López

doi:10.1016/j.mspro.2015.05.014

Cited by 24 publications

(5 citation statements)

References 8 publications

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“…6a), the maximum amplitude of the MBN profile (Mmax) is the parameter of interest. Previous investigations show correlations between Mmax and the α'-martensite content [29,30].…”

Section: Measuring Methods Measuring Methodsmentioning

confidence: 87%

Forming of metastable austenitic stainless steel tubes with axially graded martensite content by flow-forming

Arian¹,

Homberg²,

Vasquez³

et al. 2021

Esaform 2021

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One of the main objectives of production engineering is to reproducibly manufacture (complex) defect-free parts. To achieve this, it is necessary to employ an appropriate process or tool design. While this will generally prove successful, it cannot, however, offset stochastic defects with local variations in material properties. Closed-loop process control represents a promising approach for a solution in this context. The state of the art involves using this approach to control geometric parameters such as a length. So far, no research or applications have been conducted with closed-loop control for microstructure and product properties. In the project on which this paper is based, the local martensite content of parts is to be adjusted in a highly precise and reproducible manner. The forming process employed is a special, property-controlled flow-forming process. A model-based controller is thus to generate corresponding correction values for the tool-path geometry and tool-path velocity on the basis of online martensite content measurements. For the controller model, it is planned to use a special process or microstructure (correlation) model. The planned paper not only describes the experimental setup but also presents results of initial experimental investigations for subsequent use in the closed-loop control of α’-martensite content during flow-forming.

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“…6a), the maximum amplitude of the MBN profile (Mmax) is the parameter of interest. Previous investigations show correlations between Mmax and the α'-martensite content [29,30].…”

Section: Measuring Methods Measuring Methodsmentioning

confidence: 87%

Forming of metastable austenitic stainless steel tubes with axially graded martensite content by flow-forming

Arian¹,

Homberg²,

Vasquez³

et al. 2021

Esaform 2021

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show abstract

“…In this research measurements performed with the micro durometer do not show significant differences between the 0º and 90º deformed samples. On the other hand, in all the tests, it was possible to establish the beginning of the martensitic deformation and its evolution by using dynamic registration of MBN (Astudillo et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

Changes of the Magnetic Properties during Heat Treatment in AISI 304

Oršulová

Palček

Kúdelčík

2018

Period. Polytech. Transp. Eng.

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The aim of this study was to evaluate changes of the magnetic properties during heat treatment in austenitic stainless steel AISI 304. Investigated changes were caused by plastic deformation in material. Specific composition of alloying elements in austenitic stainless steels has got influence on their deformation behavior. Samples were heat treated before measurement of magnetic properties in different intervals of temperatures. The first series of measurements has shown, that it is necessary to make more precise analysis of temperature intervals in the second part of experiment. For verification of structural changes in material there was used hardness test Vickers method and observation by light optical microscope. There was proven that AISI 304 is slightly magnetic after cold forming, although in general it is considered as non-magnetic.

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“…The resulting tubes were investigated through measurements with a Feritscope (FMP 30, Helmut Fischer) using the magnetic induction method, a micromagnetic sensor (3MA-II, Fraunhofer IZFP) based on magnetic Barkhausen noise (MBN) effect, eddy current analysis (Modulus r -200 kHz) and hardness tests (HV3). The measurements were used to localize and Cryogenic nozzle Forming of cooled spot quantify the α'-martensite content, which correlates with the underlying measured variables such as the maximum amplitude of the MBN profile (Mmax) [15,16]. Fig.…”

Section: Fig 5 Spot Cooling Prior To Forming (Experiments 3)mentioning

confidence: 99%

Cryogenic reverse flow forming of AISI 304L

Arian

2023

Materials Research Proceedings

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Abstract. Workpiece property-control permits the application-oriented and time-efficient production of components. In reverse flow forming, for example, a control of the microstructure profile is not yet part of the state of the art, in contrast to the geometry control. This is, due to several reasons, particularly challenging when forming seamless tubes made of metastable austenitic stainless AISI 304L steel. Inducing mechanical and/or thermal energy can cause a phase transformation from austenite to martensite within this steel. The resulting α’-martensite has different mechanical and micromagnetic properties, which can be advantageous depending on the application. For purposes of local property control, the resulting α’-martensite content should be measured and controlled online during the forming process. This paper presents results from the usage of a custom developed cryo-system and different application strategies to use liquid nitrogen as a coolant for local enhancement of the forming-temperature depending α’-martensite content.

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Correlation between Martensitic Phase Transformation and Magnetic Barkhausen Noise of AISI 304 Steel

Cited by 24 publications

References 8 publications

Forming of metastable austenitic stainless steel tubes with axially graded martensite content by flow-forming

Forming of metastable austenitic stainless steel tubes with axially graded martensite content by flow-forming

Changes of the Magnetic Properties during Heat Treatment in AISI 304

Cryogenic reverse flow forming of AISI 304L

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