金属切屑塑性流动的稳定性

马维

STABILITY OF PLASTIC FLOW OF METALLIC CHIPS

Ma Wei

表 1 4 种金属的材料性能和J-C 本构模型参数

Table 1 The material properties and the J-C constitutive model parameters of the four testing metals

Ti6Al4V[28] AISI 4340[29] AISI 1045[14] Al 7075[30] Density ρ/(kg?m-3) 4 420 7 830 7 850 2 770 Elastic modulus E/GPa 114 200 210 71 Poisson’s ratio ν 0.342 0.29 0.3 0.3 Specific heat c/(J?kg-1?K-1) 560 477 452 885 Thermal conductivity λ/(W?m-1?K-1) 7.2 38 50 130 Expansion coefficient α/K-1 9.2#x00D7;10 - 6 3.2#x00D7;10 - 5 1.5#x00D7;10 - 5 2.32#x00D7;10 - 5 Melting temperature Tm/K 1 930 1 793 1 765 893 Taylor-Quinney coefficient β 0.9 0.93 0.93 0.9 J-C constitutive model parameters Ti6Al4V[28] AISI 4340[29] AISI 1045[14] Al 7075[30] A0/MPa 782 792 496 546 B0/MPa 498 510 434 678 n 0.28 0.26 0.307 0.71 C0 0.028 0.014 0.047 0.024 m 1 1.03 0.804 1.56 ε?0/s-1 1 1 1 1