摘要
利用不同应变速率下的拉伸试验及光学显微镜、透射电镜（TEM）、扫描电镜（SEM）观察，研究了应变速率对10MnNiCrMoV钢室温拉伸力学性能的影响。结果表明，在2．0×10^-3～1．2×10^3s^-1应变速率范围内，10MnNiCrMoV钢的抗拉强度由低应变速率（2．0×10^-3S^-1）时的620MPa增加到高应变速率（1．2×10^3s^-1）时的648MPa；伸长率则由低应变速率（2．0×10^-3S^-1）时的23％增加到高应变速率（1．2×10^3s^-1）时的31．2％；其断裂机制为穿晶型塑性断裂；10MnNiCrMoV钢高应变速率下有增塑效应，主要与位错充分扩展和滑移有关。
Effects of strain rate on room temperature mechanical properties of 10MnNiCrMoV steel were investigated by means of the observation of optical microscope, transmission electron microscope（TEM）and scanning electron microscope （SEM）and tensile test at different strain rates was carried out. The results show that tensile strength increases by 5% from 620 MPa at the strain rate 2.0 × 10^-3s^-1 to 648 MPa at the strain rate 1.2 × 10^-3s^-1 ,the elongation increases by 36% from 23% at the strain rate 2.0 ×10^-3s^-1 to 31.2% at the strain rate 1.2 ×10^-3s^-1 ,and the fracture mechanism is trans granular dimple ,within the strain rates between 2.0 × 10^-3 and 1.2× 10^-3s^-1. The plasticity increasing effect induced by high strain rate is related to the dislocation slipping and development.
出处
《金属热处理》
CAS
CSCD
北大核心
2008年第9期70-73,共4页
Heat Treatment of Metals
关键词
应变速率
拉伸性能
断裂机制
位错滑移
strain rate
tensile property
fracture mechanism
dislocation slip
