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Microstructure and mechanical properties of thermomechanically processed TRIP steel

机译：热机械加工的TRIP钢的组织和力学性能

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摘要

The strengthening mechanism responsible for the unique combination of ultimate tensile strength and elongation in a multiphase Fe-0.2C-1.5Mn-1.2Si-0.3Mo-0.6Al-0.02Nb (wt%) steel was studied. The microstructures with different volume fractions of polygonal ferrite, bainite and retained austenite were simulated by controlled thermomechanical processing. The interrupted tensile test was used to study the bainitic ferrite, retained austenite and polygonal ferrite behaviour as a function of plastic strain. X-ray analysis was used to characterise the volume fraction and carbon content of retained austenite. Transmission electron microscopy was utilised to analyse the effect of bainitic ferrite morphology on the strain induced transformation of retained austenite and retained austenite twinning as a function of strain in the bulk material. The study has shown that the austenite twinning mechanism is more preferable than the transformation induced plasticity (TRIP) mechanism during the early stages of deformation for a microstructure containing 15% polygonal ferrite, while the transformation induced plasticity effect is the main mechanism when there is 50% of polygonal ferrite in the microstructure. The bainitic ferrite morphology affects the deformation mode of retained austenite during straining. The polygonal ferrite behaviour during straining depends on dislocation substructure formed due to the deformation and the additional mobile dislocations caused by the TRIP effect. Operation of TRIP or twinning mechanisms depends not only on the chemical and mechanical stability of retained austenite, but also on the interaction of the phases during straining.
机译：研究了在多相Fe-0.2C-1.5Mn-1.2Si-0.3Mo-0.6Al-0.02Nb（wt％）钢中极限抗拉强度和伸长率独特结合的强化机理。通过控制热机械过程模拟了不同体积分数的多边形铁素体，贝氏体和残余奥氏体的显微组织。中断拉伸试验用于研究贝氏体铁素体，残余奥氏体和多边形铁素体行为与塑性应变的关系。 X射线分析用于表征残留奥氏体的体积分数和碳含量。利用透射电子显微镜分析了贝氏体铁素体形态对应变诱发的残余奥氏体和残余奥氏体孪晶的转变的影响，该转变是主体材料中的应变的函数。研究表明，对于含15％多边形铁素体的显微组织，在变形的早期阶段，奥氏体孪生机制比相变诱导塑性（TRIP）机制更可取，而当含量为50时，相变诱导塑性效应是主要的机制。显微组织中多边形铁素体的百分比。贝氏体铁素体形态影响应变过程中残余奥氏体的变形模式。应变过程中的多边形铁素体行为取决于因变形而形成的位错子结构以及由TRIP效应引起的其他移动位错。 TRIP或孪晶机制的运行不仅取决于残留奥氏体的化学和机械稳定性，而且取决于应变过程中各相的相互作用。

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