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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.
Deformation behavior, strain hardening rate, true stress and strain hardening index change with true strain during dynamic deformation of 18Mn-3Al-3Si and 21Mn-3Al-3Si high manganese TRIP / TWIP effect steels, as well as strain hardening and matrix softening The interaction between TRIP / TWIP effect and the strain before and after deformation was analyzed by using OM, SEM, TEM and XRD.The results show that the strain induced phase transformation of TRIP / TWIP effect is γ → ε → α; inhibition of slippage caused by high-speed deformation, phase transformation and deformation of austenite to martensite Twinning is the main factor of strain hardening for the austenite grain refinement. The reason of matrix softening is adiabatic temperature Ascending effect, reverse transformation of ε → γ and dynamic recrystallization of twins.