Effects of cryogenic treatment on mechanical properties and crystal orientation of 0.25C-0.80Si-1.6Mn steel with extraordinary strength-toughness

Deep cryogenic treatment (DCT) in the phase transition region of austenite (A) to ferrite (F) is a novel process that can efficiently improve the content of martensite (M) and F of dual phase (DP) steel. In this work, microstructure transformation in DP structural steel treated by DCT was investigat...

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Bibliographic Details
Published in:Materials research express 2021-03, Vol.8 (3), p.36517
Main Authors: Chen, Yongli, Li, Yuhua, Zhou, Xuejiao, Tan, Fei, Jiang, Yueyue
Format: Article
Language:English
Subjects:
Cryogenic properties
Cryogenic treatment
crystal orientation
Crystal structure
deep cryogenic treatment
dual phase steel
Dual phase steels
Electron backscatter diffraction
Grain size distribution
Martensite
Mechanical properties
Microstructure
microstructure and mechanical properties
Phase transitions
retained austenite
Structural steels
Technical services
Toughness
yield ratio
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Summary:Deep cryogenic treatment (DCT) in the phase transition region of austenite (A) to ferrite (F) is a novel process that can efficiently improve the content of martensite (M) and F of dual phase (DP) steel. In this work, microstructure transformation in DP structural steel treated by DCT was investigated in detail. Scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD) were used to characterize the microstructure, alloy distribution, grain size, and orientation for the DP structural steel. The results demonstrated that DCT could effectively improve the yield ratio and mechanical properties of the tested steel. F and its large-angle significantly reduced the influence of fine-grain strengthening on the reduction of yield ratio. This research offered innovative technical support and theory guidelines for producing and studying such extraordinary strength-toughness DP steel with high strength and low yield ratio.
ISSN:2053-1591
2053-1591
DOI:10.1088/2053-1591/abf082