2Bergman G, Oldenburg M. A finite element model for thermo- mechanical analysis of sheet metal forming [J]. Intemational Journal for Numerical Methods in Engineering,2004,59: 1167- 1186.
3Naderi M, Durrenberger L, Molinari A,et al. Constitutive relaa- tionships for 22MB5 boron steel deformed isothermally at high temperatures [J]. Materials Science and Engineering A,2008, 478 : 130-139.