期刊
JOURNAL OF MATERIALS SCIENCE
卷 45, 期 10, 页码 2580-2590出版社
SPRINGER
DOI: 10.1007/s10853-010-4229-6
关键词
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资金
- National Natural Science Foundation of China [50504007]
- Fundamental Research Funds for the Central Universities [N090407001]
- National Key Project of Scientific and Technical Supporting Programs [2007BAE51B07]
- Benxi Iron & Steel Corp., China
The microstructure evolution during thermo-mechanical processing of high-Nb HSLA steel has been investigated with laboratory investigations. Using the Gleeble 2000 thermomechanical simulator, constitutive behavior, recrystallization, and precipitation were quantified with single- and double-hit tests as well as isothermal-deformation-quenching tests. The critical strain (epsilon(c)) for the onset of dynamic recrystallization in high-Nb steel is derived and the result shows that the critical strain/peak strain ratio is as low as approximately 0.35 and tends to a constant when the effective Nb content (Nb(eff) = Nb - Mn/120 + Si/94) ranges from 0.07 to 0.10. The interaction between the recrystallization and precipitation was considered to determine non-recrystallization temperature (T (nr)) under various conditions and further the dependence of the T (nr) on initial austenite grain size, strain, and strain rate on was formulated.
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