A carbide-free bainite/martensite/austenite triplex steel with enhanced 
mechanical properties treated by a novel quenching-partitioning-tempering 
process

Gao, Guhui; Zhang, Han; Tan, Zhunli; Liu, Wenbo; Bai, Bingzhe

doi:10.1016/j.msea.2012.08.064

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A carbide-free bainite/martensite/austenite triplex steel with enhanced mechanical properties treated by a novel quenching-partitioning-tempering process

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Zhang, Han
Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Gao, G., Zhang, H., Tan, Z., Liu, W., & Bai, B. (2013). A carbide-free bainite/martensite/austenite triplex steel with enhanced mechanical properties treated by a novel quenching-partitioning-tempering process. Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing, 559, 165-169. doi:10.1016/j.msea.2012.08.064.

Cite as: https://hdl.handle.net/21.11116/0000-0001-BDEE-F

Abstract

A novel quenching-partitioning-tempering (Q-P-T) process was employed in a Mn-Si-Cr alloyed steel to obtain a triplex microstructure comprising carbide-free bainite, martensite and retained austenite. The carbide-free bainite formed during the quenching step (rather than partitioning step) of Q-P-T process can enhance the mechanical properties (e.g. the product of strength and elongation, ~31.4. GPa) by extending the partitioning time up to 30. min. A good combination of strength and elongation (Ultimate tensile strength: ~1655. MPa; Elongation: ~19) has been realized for the Mn-Si-Cr alloyed high strength steel without expensive alloying, e.g. Ni, Mo, Nb in previous QP/Q-P-T processes. The enhanced mechanical properties could be attributed to the various types of retained austenite in the Q-P-T treated carbide-free bainite/martensite/austenite triplex microstructure. © 2012 Elsevier B.V.