Analysis of the mechanical behavior of a 0.3C-1.6Si-3.5Mn (wt%) quenching and partitioning steel

Farideh HajyAkbary, Jilt Sietsma, Goro Miyamoto, Naoya Kamikawa, Roumen H. Petrov, Tadashi Furuhara, Maria J. Santofimia

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

A 0.3C-1.6Si-3.5Mn (wt%) steel was subjected to different Q&P treatments, leading to different combinations of initial martensite, bainite, secondary martensite, and retained austenite. In this study, initial martensite refers to the martensite formed during the initial quenching step and then subjected to an isothermal treatment at 400 °C; secondary martensite refers to martensite formed during quenching from 400 °C to room temperature. The yield strength of each constituent phase was determined by applying physical models to the data obtained from detailed microstructural characterization. The yield strength (uncertainty of 5%) of the Q&P microstructures was calculated by using a composite law to account for the contribution of each constituent phase. The dependence of the yield strength on the microstructural features of the Q&P microstructures was revealed by using the approach developed in this work. For example, initial martensite (which has a high yield strength and is the dominant phase in the microstructures) had the greatest effect on the yield strength of the Q&P microstructures. Furthermore, the phase fraction and dislocation density of this phase increased with decreasing quenching temperature, leading to an increase in the yield strength of the material.

Original languageEnglish
Pages (from-to)505-514
Number of pages10
JournalMaterials Science and Engineering A
Volume677
DOIs
Publication statusPublished - 2016 Nov 20

Keywords

  • Dislocation density
  • Martensite
  • Quenching and partitioning steels
  • Strengthening mechanism
  • Yield strength

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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