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Title: In Situ Local Measurement of Austenite Mechanical Stability and Transformation Behavior in Third-Generation Advanced High-Strength Steels

Abstract

Austenite mechanical stability, i.e., retained austenite volume fraction (RAVF) variation with strain, and transformation behavior were investigated for two third generation advanced high strength steels (3GAHSS) under quasi-static uniaxial tension: a 1200 grade, two-phase medium Mn (10 wt%) TRIP steel, and a 980 grade, three-phase TRIP steel produced with a quenching and partitioning heat treatment. The Mn (10 wt%) TRIP steel deforms inhomogeneously via propagative instabilities (Lüders and Portevin Le Châtelier-like bands) while the 980 grade TRIP steel deforms homogenously up to necking. The dramatically different deformation behaviors of these steels required the development of a new in-situ experimental technique that couples volumetric synchrotron X-ray diffraction measurement of RAVF with surface strain measurement using stereo digital image correlation (DIC) over the beam impingement area. Measurement results with the new technique are compared with those from a more conventional approach wherein strains are measured over the entire gauge region while RAVF measurement is the same as that in the new technique. A determination is made as to the appropriateness of the different measurement techniques in measuring the transformation behaviors for steels with homogeneous and inhomogeneous deformation behaviors. Here, extension of the new in-situ technique to the measurement of austenite transformation undermore » different deformation modes and to higher strain rates is discussed.« less

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [5]
  1. Clemson Univ., Greenville, SC (United States)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)
  5. GM Global R&D Center, Warren, MI (United States)
  6. AK Steel Research, Middletown, OH (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1460370
Alternate Identifier(s):
OSTI ID: 1468247; OSTI ID: 1558650
Report Number(s):
PNNL-SA-125784
Journal ID: ISSN 1073-5623; 140553
Grant/Contract Number:  
AC02-06CH11357; AC05-00OR22725; AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science
Additional Journal Information:
Journal Volume: 49; Journal Issue: 7; Journal ID: ISSN 1073-5623
Publisher:
ASM International
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; advanced high strength steels; digital image correlation; inhomogeneous deformation; retained austenite volume faction; synchrotron X-ray diffraction

Citation Formats

Abu-Farha, Fadi, Hu, Xiaohua, Sun, Xin, Ren, Yang, Hector, Jr., Louis G., Thomas, Grant, and Brown, Tyson W. In Situ Local Measurement of Austenite Mechanical Stability and Transformation Behavior in Third-Generation Advanced High-Strength Steels. United States: N. p., 2018. Web. doi:10.1007/s11661-018-4660-x.
Abu-Farha, Fadi, Hu, Xiaohua, Sun, Xin, Ren, Yang, Hector, Jr., Louis G., Thomas, Grant, & Brown, Tyson W. In Situ Local Measurement of Austenite Mechanical Stability and Transformation Behavior in Third-Generation Advanced High-Strength Steels. United States. doi:10.1007/s11661-018-4660-x.
Abu-Farha, Fadi, Hu, Xiaohua, Sun, Xin, Ren, Yang, Hector, Jr., Louis G., Thomas, Grant, and Brown, Tyson W. Fri . "In Situ Local Measurement of Austenite Mechanical Stability and Transformation Behavior in Third-Generation Advanced High-Strength Steels". United States. doi:10.1007/s11661-018-4660-x. https://www.osti.gov/servlets/purl/1460370.
@article{osti_1460370,
title = {In Situ Local Measurement of Austenite Mechanical Stability and Transformation Behavior in Third-Generation Advanced High-Strength Steels},
author = {Abu-Farha, Fadi and Hu, Xiaohua and Sun, Xin and Ren, Yang and Hector, Jr., Louis G. and Thomas, Grant and Brown, Tyson W.},
abstractNote = {Austenite mechanical stability, i.e., retained austenite volume fraction (RAVF) variation with strain, and transformation behavior were investigated for two third generation advanced high strength steels (3GAHSS) under quasi-static uniaxial tension: a 1200 grade, two-phase medium Mn (10 wt%) TRIP steel, and a 980 grade, three-phase TRIP steel produced with a quenching and partitioning heat treatment. The Mn (10 wt%) TRIP steel deforms inhomogeneously via propagative instabilities (Lüders and Portevin Le Châtelier-like bands) while the 980 grade TRIP steel deforms homogenously up to necking. The dramatically different deformation behaviors of these steels required the development of a new in-situ experimental technique that couples volumetric synchrotron X-ray diffraction measurement of RAVF with surface strain measurement using stereo digital image correlation (DIC) over the beam impingement area. Measurement results with the new technique are compared with those from a more conventional approach wherein strains are measured over the entire gauge region while RAVF measurement is the same as that in the new technique. A determination is made as to the appropriateness of the different measurement techniques in measuring the transformation behaviors for steels with homogeneous and inhomogeneous deformation behaviors. Here, extension of the new in-situ technique to the measurement of austenite transformation under different deformation modes and to higher strain rates is discussed.},
doi = {10.1007/s11661-018-4660-x},
journal = {Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science},
number = 7,
volume = 49,
place = {United States},
year = {2018},
month = {5}
}

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    Works referencing / citing this record:

    An Evolutionary Yield Function Model Based on Plastic Work and Non-Associated Flow Rule
    journal, May 2019

    • Park, Taejoon; Abu-Farha, Fadi; Pourboghrat, Farhang
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