Microstructure Characteristics, Mechanical Properties and Strain Hardening Behavior of Nitrogen-Bearing Fe-0.2 C-5Mn TRIP Steel

As a strong and low-priced austenite stabilizer, nitrogen (0.085 wt%) was deliberately added into a hot-rolled Fe-0.2C-5Mn TRIP steel for optimizing the strength–ductility balance. Nitrogen addition can not only increase austenite fraction (> 50%), but also favor the improvement of austenite stab...

Full description

Saved in:
Bibliographic Details
Published in:Metals and materials international 2023, 29(3), , pp.607-617
Main Authors: Zhang, Bao-Guang, Zhang, Xiao-Ming, Li, Hua-Bing, Liu, Hai-Tao
Format: Article
Language:English
Subjects:
Annealing
Austenite
Carbon nitride
Cementite
Characterization and Evaluation of Materials
Chemistry and Materials Science
Ductility
Elongation
Engineering Thermodynamics
Ferrite
Grain boundaries
Heat and Mass Transfer
Hot rolling
Machines
Magnetic Materials
Magnetism
Manufacturing
Materials Science
Mechanical properties
Metallic Materials
Nitrogen
Precipitation hardening
Processes
Solid Mechanics
Strain hardening
Strengthening
Tensile strength
TRIP steels
재료공학
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:As a strong and low-priced austenite stabilizer, nitrogen (0.085 wt%) was deliberately added into a hot-rolled Fe-0.2C-5Mn TRIP steel for optimizing the strength–ductility balance. Nitrogen addition can not only increase austenite fraction (> 50%), but also favor the improvement of austenite stability due to its partition behavior from ferrite to austenite during intercritical annealing. Besides, the low annealing temperature (635 °C) and nitrogen addition result in the simultaneous precipitation of cementite (size, 21–396 nm) and carbonitride (size, 7–193 nm) in ferrite and at grain boundaries, which can effectively increase the yield strength through precipitation strengthening (33–63 and 41–61 MPa, respectively). Furthermore, the sufficient interstitial solute originated from N addition as well as the discontinuous TRIP effect benefits the strong serrated flow behavior and multi-peak strain hardening behavior. As a result, the strong TRIP effect together with precipitation strengthening is believed to be responsible for the excellent strength–ductility balance of present steel annealed for 3 h, demonstrating a high tensile strength of 1043 MPa, outstanding total elongation of 43.3% and superior product of strength and elongation (PSE) of 44.8 GPa%. Graphical Abstract
ISSN:1598-9623
2005-4149
DOI:10.1007/s12540-022-01253-1