A Dual-Phase Press-Hardening Steel with Improved Mechanical Properties and Superior Oxidation Resistance

A dual-phase steel (martensite and ferrite) was designed and manufactured for the hot-forming application in automobile. When the quenching from an intercritical temperature of 825 °C produced about 19 pct fraction of ferrite grains and 80 pct martensite in this steel, such a dual-phase microstructu...

Full description

Saved in:
Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2022-06, Vol.53 (6), p.1934-1944
Main Authors: Ding, Cancan, Hu, Kuanhui, Chen, Hua, Hu, Bin, Luo, Haiwen
Format: Article
Language:English
Subjects:
Boron steels
Characterization and Evaluation of Materials
Chemistry and Materials Science
Chromium
Cold
Continuous casting
Cooling
Dual phase steels
Ductility
Elongation
Ferrite
Hot forming
International Metallurgical Processes Workshop for Young Scholars (IMPROWYS 2021)
Martensite
Materials Science
Mechanical properties
Metallic Materials
Microstructure
Nanotechnology
Oxidation resistance
Silicon
Steel
Structural Materials
Surfaces and Interfaces
Temperature
Tensile strength
Thin Films
Topical Collection: 2021 Metallurgical Processes Workshop for Young Scholars
Ultimate tensile strength
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:A dual-phase steel (martensite and ferrite) was designed and manufactured for the hot-forming application in automobile. When the quenching from an intercritical temperature of 825 °C produced about 19 pct fraction of ferrite grains and 80 pct martensite in this steel, such a dual-phase microstructure could ensure that both uniform and post-uniform elongations are decent sufficiently without deteriorating strength, i.e. , achieving the best mechanical combination of 1762 MPa ultimate tensile strength (UTS) and 11.2 pct total elongation (TE), which is far better than 22MnB5. The straining behavior of ferrite and martensite during deformation is then discussed on the basis of microstructural parameters. Moreover, much thinner oxide layer, less than 1.6 μ m thickness, was formed on the steel after the hot forming than that on 22MnB5, because much lower soaking temperature was employed to produce the dual phase in this steel and the denser/thicker Si/Cr-rich oxide band formed at the bottom of layer, both could greatly reduce the oxidization during hot forming.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-022-06650-0