对18Mn-3Al-3Si和21Mn-3Al-3Si高锰TRIP/TWIP效应共生钢动态变形过程中的变形行为, 应变硬化速率、真应力和应变硬化指数随真应变的变化, 以及应变硬化和基体软化间的相互作用等进行了研究, 采用OM, SEM, TEM和XRD等方法对变形前后的组织进行了分析. 结果表明, 高应变速率下, TRIP/TWIP效应共生钢应变诱发相变途径为γ→ε→α; 高速变形对滑移的抑制、奥氏体向马氏体的相变和形变孪晶对奥氏体晶粒的细化是应变硬化的主要因素; 造成基体软化的原因是绝热温升效应、ε→γ的逆相变和孪晶的动态再结晶.
The high manganese TRIP/TWIP symbiotic effect steel exhibits excellent combination of strength and elongation due to the transformation-induced plasticity and twinning-induced plasticity. In this paper, by means of a Zwick HTM 5020 high rate tensile test machine, the mechanical behavior of 18Mn-3Al-3Si and 21Mn-3Al-3Si high manganese TRIP/TWIP symbiotic effect steels under dynamic condition, strain hardening rate, true stress and strain hardening exponent show fluctuating with the true stain change, which is caused by the interaction between strain hardening and matrix softening. The microstructure evolution of the specimen was analyzed by OM, SEM, TEM and XRD. The results indicate that the transformation route is γ→ε, ε→α, under high-speed deformation; hindering of high-speed deformation to slip, transformation from austenite to martensite, and refinement of austenite matrix due to deformation twins are the main factors of strain hardening; while adiabatic temperature rise effect, ε→γ reverse transformation and dynamic recrystallization of twins make the matrix softening.
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