中文版 | English
Title

Effect of ultra-fast heating on microstructure and mechanical properties of cold-rolled low-carbon low-alloy Q&P steels with different austenitizing temperature

Author
Corresponding AuthorTan, Xiaodong; Lu, Wenjun
Publication Years
2022-09
DOI
Source Title
ISSN
1044-5803
Volume191
Abstract
We performed ultra-fast heating (150 °C/s) quenching and partitioning (Q&P) processes to a cold-rolled low-carbon low-alloy steel. Adjusting the annealing temperature, we obtained two types of ferrite-containing Q&P steels with different matrix structure, i.e., martensitic matrix and ferritic matrix. The effect of ultra-fast heating on microstructure evolution and mechanical properties was analyzed, compared with the samples treated with conventional heating rate (10 °C/s). We also investigated the strain partition and fracture behaviors, basing on in-situ tensile tests under SEM. Results show that ultra-fast heating can significantly increase the Ac1 and Ac3 temperatures, and extend the temperature span of intercritical zone. It can also delay the complete recrystallization of deformed ferrite and promote the austenite nucleation, which leads to the structure refinement of the sample with martensitic matrix, improving both the strength and ductility. The increase of austenite nucleation rate and the incomplete recrystallization of deformed ferrite jointly promote the austenite transformation, which results in a distinct increase of martensite islands fraction in the sample with ferritic matrix, leading to its obvious increase of tensile strength and decrease of ductility. Strain partition is an important factor affecting the TRIP effect in ferrite-containing Q&P steels. For the sample with a martensitic matrix, retained austenite mainly possesses a film-like morphology and exists between martensite laths. The relatively high mechanical stability of retained austenite films and low local strain in martensitic regions result in the weak TRIP effect. The retained austenite in the sample with a ferritic matrix mainly distributes among ferrite grains and exhibits a blocky morphology. The relatively low mechanical stability of blocky retained austenite and high local strain in ferrite jointly enhance the TRIP effect.

© 2022 Elsevier Inc.

Indexed By
SCI ; EI
Language
English
SUSTech Authorship
Others
Funding Project
The authors are grateful for support from the Natural Science Foundation of Chongqing , China (No. cstc2018jcyjAX0221 ) and the Venture & Innovation Support Program for Chongqing Overseas Returnees (No. cx2020124 ).
WOS Accession No
WOS:000830291600001
Publisher
EI Accession Number
20222812339180
EI Keywords
Alloy Steel ; Austenite ; Cold Rolled Steel ; Cold Rolling ; Ductility ; Heating ; High Strength Steel ; Low Carbon Steel ; Martensite ; Martensitic Transformations ; Mechanical Stability ; Metal Cladding ; Microstructure ; Morphology ; Nucleation ; Recrystallization (Metallurgy) ; Steel Sheet ; Strain ; Tensile Strength ; Tensile Testing
ESI Classification Code
Metallurgy:531.1 ; Metallography:531.2 ; Metal Rolling:535.1 ; Rolling Mill Practice:535.1.2 ; Steel:545.3 ; Physical Properties Of Gases, Liquids And Solids:931.2 ; Crystal Growth:933.1.2 ; Materials Science:951
ESI Research Field
MATERIALS SCIENCE
Data Source
EV Compendex
Citation statistics
Cited Times [WOS]:5
Document TypeJournal Article
Identifierhttp://kc.sustech.edu.cn/handle/2SGJ60CL/519753
DepartmentDepartment of Mechanical and Energy Engineering
Affiliation
1.School of Materials and Energy, Southwest University, Chongqing; 400715, China
2.Department of Mechanical and Energy Engineering, South University of Science and Technology of China, Shenzhen; 518055, China
Corresponding Author AffilicationDepartment of Mechanical and Energy Engineering
Recommended Citation
GB/T 7714
Tan, Xiaodong,Lu, Wenjun,Rao, Xi. Effect of ultra-fast heating on microstructure and mechanical properties of cold-rolled low-carbon low-alloy Q&P steels with different austenitizing temperature[J]. MATERIALS CHARACTERIZATION,2022,191.
APA
Tan, Xiaodong,Lu, Wenjun,&Rao, Xi.(2022).Effect of ultra-fast heating on microstructure and mechanical properties of cold-rolled low-carbon low-alloy Q&P steels with different austenitizing temperature.MATERIALS CHARACTERIZATION,191.
MLA
Tan, Xiaodong,et al."Effect of ultra-fast heating on microstructure and mechanical properties of cold-rolled low-carbon low-alloy Q&P steels with different austenitizing temperature".MATERIALS CHARACTERIZATION 191(2022).
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