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Title: Investigating the Difference in Mechanical Stability of Retained Austenite in Bainitic and Martensitic High-Carbon Bearing Steels using in situ Neutron Diffraction and Crystal Plasticity Modeling

Abstract

In situ neutron diffraction of the uniaxial tension test was used to study the effect of the surrounding matrix microstructure on the mechanical stability of retained austenite in high-carbon bearing steels. Comparing the samples with bainitic microstructures to those with martensitic ones, it was found that the retained austenite in a bainitic matrix starts transforming into martensite at a lower strain compared to that within a martensitic matrix. On the other hand, the rate of transformation of the austenite was found to be higher within a martensitic microstructure. Crystal plasticity modeling was used to analyze the transformation phenomenon in these two microstructures and determine the effect of the surrounding microstructure on elastic, plastic, and transformation components of the strain. The results showed that the predominant difference in the deformation accumulated was from the transformation strain and the critical transformation driving force within the two microstructures. The retained austenite was more stable for identical loading conditions in case of martensitic matrix compared to the bainitic one. It was also observed that the initial volume fraction of retained austenite within the bainitic matrix would alter the onset of transformation to martensite, but not the rate of transformation.

Authors:
ORCiD logo; ORCiD logo; ; ; ORCiD logo; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1509507
Grant/Contract Number:  
IPTS-18594
Resource Type:
Published Article
Journal Name:
Metals
Additional Journal Information:
Journal Name: Metals Journal Volume: 9 Journal Issue: 5; Journal ID: ISSN 2075-4701
Publisher:
MDPI AG
Country of Publication:
Switzerland
Language:
English

Citation Formats

Voothaluru, Rohit, Bedekar, Vikram, Yu, Dunji, Xie, Qingge, An, Ke, Pauskar, Praveen, and Hyde, R. Scott. Investigating the Difference in Mechanical Stability of Retained Austenite in Bainitic and Martensitic High-Carbon Bearing Steels using in situ Neutron Diffraction and Crystal Plasticity Modeling. Switzerland: N. p., 2019. Web. doi:10.3390/met9050482.
Voothaluru, Rohit, Bedekar, Vikram, Yu, Dunji, Xie, Qingge, An, Ke, Pauskar, Praveen, & Hyde, R. Scott. Investigating the Difference in Mechanical Stability of Retained Austenite in Bainitic and Martensitic High-Carbon Bearing Steels using in situ Neutron Diffraction and Crystal Plasticity Modeling. Switzerland. doi:10.3390/met9050482.
Voothaluru, Rohit, Bedekar, Vikram, Yu, Dunji, Xie, Qingge, An, Ke, Pauskar, Praveen, and Hyde, R. Scott. Fri . "Investigating the Difference in Mechanical Stability of Retained Austenite in Bainitic and Martensitic High-Carbon Bearing Steels using in situ Neutron Diffraction and Crystal Plasticity Modeling". Switzerland. doi:10.3390/met9050482.
@article{osti_1509507,
title = {Investigating the Difference in Mechanical Stability of Retained Austenite in Bainitic and Martensitic High-Carbon Bearing Steels using in situ Neutron Diffraction and Crystal Plasticity Modeling},
author = {Voothaluru, Rohit and Bedekar, Vikram and Yu, Dunji and Xie, Qingge and An, Ke and Pauskar, Praveen and Hyde, R. Scott},
abstractNote = {In situ neutron diffraction of the uniaxial tension test was used to study the effect of the surrounding matrix microstructure on the mechanical stability of retained austenite in high-carbon bearing steels. Comparing the samples with bainitic microstructures to those with martensitic ones, it was found that the retained austenite in a bainitic matrix starts transforming into martensite at a lower strain compared to that within a martensitic matrix. On the other hand, the rate of transformation of the austenite was found to be higher within a martensitic microstructure. Crystal plasticity modeling was used to analyze the transformation phenomenon in these two microstructures and determine the effect of the surrounding microstructure on elastic, plastic, and transformation components of the strain. The results showed that the predominant difference in the deformation accumulated was from the transformation strain and the critical transformation driving force within the two microstructures. The retained austenite was more stable for identical loading conditions in case of martensitic matrix compared to the bainitic one. It was also observed that the initial volume fraction of retained austenite within the bainitic matrix would alter the onset of transformation to martensite, but not the rate of transformation.},
doi = {10.3390/met9050482},
journal = {Metals},
number = 5,
volume = 9,
place = {Switzerland},
year = {2019},
month = {4}
}

Journal Article:
Free Publicly Available Full Text
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DOI: 10.3390/met9050482

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