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Study of Deformation Behavior and Microstructural Evolution in Multiphase Steel.

Jun Lu1, Hao Yu2, Xiaoni Duan3

  • 1School of Materials Science and Engineering, University of Science and Technology Beijing, No. 30 Xueyuan Road, Haidain District, Beijing 100083, China. b20160180@xs.ustb.edu.cn.

Materials (Basel, Switzerland)
|November 18, 2018
PubMed
Summary
This summary is machine-generated.

This study reveals how retained austenite (RA) in multiphase steel transforms during tensile deformation, enhancing strain hardening. The steel

Keywords:
grain subdivisionphase transformationretained austenitetensile deformation

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Area of Science:

  • Materials Science
  • Metallurgy
  • Mechanical Engineering

Background:

  • High-performance multiphase steels are crucial for advanced engineering applications.
  • Understanding the interplay between microstructure and mechanical properties under stress is essential.
  • Complex microstructures, including retained austenite, offer unique deformation mechanisms.

Purpose of the Study:

  • To investigate the tensile deformation characteristics of a high-performance multiphase steel.
  • To analyze the deformation-induced transformation behavior of retained austenite (RA).
  • To elucidate the role of microstructure evolution in enhancing strain hardening capacity.

Main Methods:

  • Specific heat treatment to achieve a fine-grained multiphase microstructure (ferrite, bainite, RA).
  • Tensile testing at various strain levels (0% to 20%).
  • Advanced characterization using X-ray diffraction, transmission electron microscopy, and electron backscatter diffraction.

Main Results:

  • Retained austenite (RA) undergoes transformation during plastic deformation, contributing significantly to strain hardening.
  • The morphology and distribution of RA influence its transformation stability: blocky RA transforms early, while film-like RA transforms continuously.
  • Ferrite grains exhibit substructure formation and refinement due to dislocation configurations, leading to grain refinement strengthening.

Conclusions:

  • The high strain hardening capacity of the steel is attributed to the martensitic transformation of RA and ferrite grain refinement.
  • Microstructure engineering, particularly the control of RA, is key to developing advanced high-strength steels.
  • The study provides insights into the deformation mechanisms governing the performance of complex multiphase steels.