Effect of tempering on microstructure and mechanical properties of 3Mn-Si-Ni martensitic steel

Yan jun Zhao*, Xue ping Ren, Zhi liu Hu, Zhi ping Xiong, Jian min Zeng, Bao yu Hou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

The dependence of microstructures and mechanical properties on tempering temperature (from 180 to 650 °C) in a designed 3Mn-Si-Ni martensitic steel was systematically analyzed. Microstructure was characterized using scanning and transmission electron microscopy; mechanical properties were measured using uniaxial tensile test and Charpy V-notch impact test. After tempering at different temperatures, recovery, partial recrystallization, carbides precipitation and decomposition of residual austenite were observed. After tempering at 230 °C, an excellent combination of strength (1550 MPa) and toughness (91.5 J) was achieved, due to high dislocation density and ε-carbides precipitation. However, with an increase in tempering temperature from 320 to 550 °C, tempered martensite embrittlement was observed, where impact energy was ~ 10 J. It was ascribed to cementite formation instead of transition carbides and decomposition of residual austenite. With an increase in tempering temperature up to 650 °C, high fracture impact toughness of 75 J was obtained with deteriorated tensile strength of 850 MPa due to strong recovery and partial recrystallization.

Original languageEnglish
Pages (from-to)397-404
Number of pages8
JournalMaterials Science and Engineering: A
Volume711
DOIs
Publication statusPublished - 10 Jan 2018
Externally publishedYes

Keywords

  • Carbides
  • Impact toughness
  • Martensitic steel
  • Tempering martensitic embrittlement

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