Analysis of change in microstructure and properties during high temperature processing of ultralow C and high Nb microalloyed steel

Autor: Guoren Wang, Yongmei Yu, Y. B. Xu, Z.-Y. Liu, Bao Liang Xiao
Rok vydání: 2011
Předmět:
Zdroj: Materials Science and Technology. 27:1558-1564
ISSN: 1743-2847
0267-0836
DOI: 10.1179/026708310x12815992418175
Popis: To further improve the strength and toughness, the advanced thermomechanical controlled processing has been applied in the development of an ultralow C and high Nb bearing steel. In the present investigation, the effects of processing parameters, consisting of the coiling and starting temperatures in non-recrystallisation region, on the final microstructure and mechanical properties of this steel have been studied by tensile, Charpy impact tests, optical microscopy and transmission electron microscopy. Results indicate that the acicular ferrite dominated microstructure can be greatly refined in grain size with decreasing the starting temperature of finishing rolling. However, for high Nb steels, the too low starting temperature would promote the formation of high temperature transformation products and consequently make against the improvement of mechanical properties. In addition, the optimum temperature window of finishing rolling is found to be also related to alloying levels of austenite stabi...
Databáze: OpenAIRE
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