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

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

33 Scopus Citations
View graph of relations

Author(s)

  • Fadi Abu-Farha
  • Xiaohua Hu
  • Xin Sun
  • Louis G. Hector
  • Grant Thomas
  • Tyson W. Brown

Detail(s)

Original languageEnglish
Pages (from-to)2583-2596
Journal / PublicationMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume49
Issue number7
Publication statusPublished - 1 Jul 2018
Externally publishedYes

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 pct) TRIP steel, and a 980 grade, three-phase TRIP steel produced with a quenching and partitioning heat treatment. The medium Mn (10 wt pct) 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 over the beam impingement area. Measurement results with the new technique are compared to those from a more conventional approach wherein strains are measured over the entire gage 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. Extension of the new in situ technique to the measurement of austenite transformation under different deformation modes and to higher strain rates is discussed.

Bibliographic Note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

Citation Format(s)

In Situ Local Measurement of Austenite Mechanical Stability and Transformation Behavior in Third-Generation Advanced High-Strength Steels. / Abu-Farha, Fadi; Hu, Xiaohua; Sun, Xin et al.
In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 49, No. 7, 01.07.2018, p. 2583-2596.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review