| Autor: |
Yun Bo Xu, Yong Mei Yu, Bao Liang Xiao, Zhen Yu Liu, Guo Dong Wang |
| Předmět: |
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| Zdroj: |
Journal of Materials Science; May2010, Vol. 45 Issue 10, p2580-2590, 11p, 2 Charts, 12 Graphs |
| Abstrakt: |
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 (εc) 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 (Nbeff = 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 ( Tnr) under various conditions and further the dependence of the Tnr on initial austenite grain size, strain, and strain rate on was formulated. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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