Effects of the tempering temperature on microstructure and mechanical properties of X70 dual phase steel

Authors

  • ZIDELMEL SAMI Laboratory Process Engineering, University of Laghouat, B.P. 37G route de Ghardaia 03000 Laghouat, Algeria
  • Allaoui Omar Laboratory Process Engineering, University of Laghouat, B.P. 37G route de Ghardaia 03000 Laghouat, Algeria

DOI:

https://doi.org/10.30544/753

Keywords:

dual phase steel; intercritical annealing; tempering; mechanical properties.

Abstract

This study uses direct quenching (DQ) heat treatment at an intercritical annealing temperature (IAT) of 800 °C to form a martensite-ferrite dual phase microstructure of X70 steel. The effects of tempering temperatures ranging from 200 to 500 °C on tensile properties in a dual-phase X70 steel are investigated. Carbon diffusion and redistribution in the microstructure are influenced by tempering. It was discovered that the amount of carbides increases with the tempered temperature, resulting in depleted carbon in martensite. Conversely, increasing the tempered temperature causes a decrease in ultimate tensile strength and yield strength while increasing elongation.

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Published

2022-06-30

How to Cite

SAMI, ZIDELMEL, and Allaoui Omar. 2022. “Effects of the Tempering Temperature on Microstructure and Mechanical Properties of X70 Dual Phase Steel”. Metallurgical and Materials Engineering 28 (2):351-58. https://doi.org/10.30544/753.

Issue

Section

Research