Effect of microstructure on tensile properties of quenched and partitioned martensitic stainless steels

A. Sierra-Soraluce*, G. Li, M. J. Santofimia, J. M. Molina-Aldareguia, A. Smith, M. Muratori, I. Sabirov

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)
54 Downloads (Pure)

Abstract

Quenching and partitioning (Q&P) treatment has been proven effective in manufacturing advanced high strength steels with high content of retained austenite, showing the improved balance of high strength and sufficient ductility. This method has been very well elaborated for carbon steel processing over the last two decades. Though it can also be potentially applied for processing other steel families, this has been scarcely studied. This article focuses on the effect of chemistry and heat treatment parameters on the microstructure and properties of Q&P treated martensitic stainless steels. Three different martensitic stainless steels with different contents of alloying elements are subjected to Q&P processing with varying quenching temperature or partitioning temperature and partitioning time. The tensile behavior of the Q&P treated steels is studied. The effect of chemistry and Q&P treatment parameters on the microstructure and tensile properties is analyzed. The effect of plastic deformation on the microstructure of the Q&P treated steels is also investigated. It is demonstrated that the Q&P treated martensitic stainless steels can show a good combination of enhanced strength and sufficient tensile ductility. Their uniform elongation increases with the increasing volume fraction of retained austenite due to the transformation induced plasticity (TRIP) effect. The ability of the martensitic matrix to accumulate plastic deformation also plays an important role. The Q&P process - microstructure - property relationship is discussed.

Original languageEnglish
Article number144540
Number of pages14
JournalMaterials Science and Engineering A
Volume864
DOIs
Publication statusPublished - 2023

Keywords

  • Electron backscatter diffraction
  • Phase transformation
  • Quenching and partitioning
  • Retained austenite
  • Stainless steel
  • Tensile properties

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