Mechanical properties and hot-rolled microstructures of a low carbon bainitic steel with Cu-P alloying

Cui, W. F., Zhang, S. X., Jiang, Y., Dong, J. and Liu, C. M. (2011) Mechanical properties and hot-rolled microstructures of a low carbon bainitic steel with Cu-P alloying. Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 528 21: 6401-6406. doi:10.1016/j.msea.2011.05.013


Author Cui, W. F.
Zhang, S. X.
Jiang, Y.
Dong, J.
Liu, C. M.
Title Mechanical properties and hot-rolled microstructures of a low carbon bainitic steel with Cu-P alloying
Journal name Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing   Check publisher's open access policy
ISSN 0921-5093
1873-4936
Publication date 2011-08-15
Sub-type Article (original research)
DOI 10.1016/j.msea.2011.05.013
Volume 528
Issue 21
Start page 6401
End page 6406
Total pages 6
Place of publication Lausanne, Switzerland
Publisher Elsevier S.A.
Collection year 2012
Language eng
Abstract A low carbon bainitic steel with Cu–P alloying was developed. The new steel aims to meet the demand of high strength, high toughness and resistance to chloride ion corrosion for the components used in the environment of sea water and oceanic atmosphere. Mechanical properties of the steel were tested and strengthening and toughening mechanisms were analyzed by comparing hot-rolled microstructures of the low carbon bainitic steels with and without Cu–P alloying. The results show that Cu–P alloying provided strong solution strengthening with weak effect on ductility. The toughness loss caused by Cu–P alloying could be balanced by increasing the amount of martensite/remained austenite (M/A island) at lower finishing temperature. The static recovery process during rolling interval was delayed by the interaction of phosphorous, copper atoms with dislocations, which was favorable to the formation of bainitic plates. Super-fine Nb(C, N) particles precipitated on dislocations had coherency with bainite ferrite at 830 ◦C finishing temperature. Raising finishing temperature to 880 ◦C, Nb(C, N) particles were prone to coarsening and losing coherency. It was also found that no accurate lattice match relationship among retained austenite, martensite and bainite in granular bainitic microstructure.
Keyword Steel
Mechanical characterization
Bainite
Austenite
Precipitation
Dislocations
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2012 Collection
 
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