Ultrafine-grained steel fabricated using warm multiaxial forging: Microstructure and mechanical properties

This study was focused on the effect of VC addition on the microstructure and mechanical properties of the prepared ultrafine grained cemented carbides. VC was added to the rawoxide materials which were synthesized to the WC-Co composite powder by the in-situ reduction and carbonization process. The ultrafine grained WC-Co alloys were fabricated by the spark plasma sintering technique using the prepared WC-Co composite powder. The phase constitution, microstructure characteristics and mechanical properties of the sintered ultrafine grained cemented carbides were analyzed quantitatively. The study proposed that VC plays a significant role in decreaseing the grain size of the prepared WC-Co alloy. The ultrafine grained WC-Co alloy with high comprehensive properties can be obtained as an appropriate addition of VC in the developed process.

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Microstructure and mechanical properties of ultrafine-grained fcc/hcp cobalt processed by a bottom-up approach

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2009.09.153 ◽

2010 ◽

Vol 489 (2) ◽

pp. 424-428 ◽

Cited By ~ 18

Author(s):

F. Fellah ◽

G. Dirras ◽

J. Gubicza ◽

F. Schoenstein ◽

N. Jouini ◽

...

Keyword(s):

Mechanical Properties ◽

Bottom Up ◽

Microstructure And Mechanical Properties ◽

Ultrafine Grained

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Influence of Mn Content on the Microstructure and Mechanical Properties of Ultrafine Grained C-Mn Steels

ISIJ International ◽

10.2355/isijinternational.45.1721 ◽

2005 ◽

Vol 45 (11) ◽

pp. 1721-1726 ◽

Cited By ~ 30

Author(s):

Rongjie SONG ◽

Dirk PONGE ◽

Dierk RAABE

Keyword(s):

Mechanical Properties ◽

Microstructure And Mechanical Properties ◽

Ultrafine Grained ◽

Mn Content

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Mechanical Nanocrystallization Surface Treatment on the Reheated 400MPa Ultrafine Grained Steel

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.79-82.377 ◽

2009 ◽

Vol 79-82 ◽

pp. 377-380

Author(s):

Hong Yun Zhao ◽

Guo Dong Wang ◽

Chun Hua Xu ◽

Feng Yuan Shu

Keyword(s):

Mechanical Properties ◽

Surface Treatment ◽

Room Temperature ◽

Performance Testing ◽

Surface Form ◽

Test Results ◽

Ultrafine Grained ◽

Before And After ◽

Different Temperatures ◽

Ultrafine Grained Steel

After reheated at different temperatures for 5 minutes, the 400MPa Ultrafine Grained Steel specimens were air-cooled to room temperature, and then carried out the mechanical nanocrystallization surface treatment and structure performance testing. On the basis of comparing the test results on the specimens before and after the mechanical nanocrystallization surface treatment, the process of mechanical nanocrystallization was analyzed briefly. The results show that: as the reheating temperature rising, the trend of grain size growing increases markedly, and the mechanical properties also drop down to different degrees; when the reheating temperature is around 800°C, because of the pearlite spheroidized significantly, its mechanical properties drop the most seriously; after the mechanical nanocrystallization surface treatment, not only its surface form a layer of fine nano-layer (about 100 nm) structure, but also its mechanical properties rise obviously, and the yield strength is over 450MPa.

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