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首页> 外文期刊>Materials Science and Engineering >The valuation of microstructural evolution in a thermo-mechanically processed transformation-twinning induced plasticity steel during strain hardening
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The valuation of microstructural evolution in a thermo-mechanically processed transformation-twinning induced plasticity steel during strain hardening

机译：应变硬化过程中热机械处理的孪生双相诱导塑性钢的微观组织演化评估

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摘要

The successive evolution of martensitic transformation, twining and dislocation substructure formation in a transformation-twinning induced plasticity steel during room temperature straining was studied in the present work. This was materialized through microstructural observations and micro-texture examinations utilizing the electron backscattered diffraction method. To evaluate the strain hardening behaviour of the thermo-mechanically processed steel, tensile testing procedure to different strains at ambient temperature was practiced. The results indicated that the dislocation slip, mechanical twinning, and deformation induced epsilon/alpha'-martensite formation were involved as the deformation mechanisms. At the early stages of deformation, the dynamic formation of dislocation substructure, strain induced epsilon-martensite and twins from austenite played the main role in the observed work hardening behaviour. Furthermore, the results demonstrated that the formation of alpha'martensite was the dominant deformation mechanism at higher deformation levels. The corresponding texture analysis indicated to a double fibre texture formation, with a relatively stronger 111 at lower strains and a stronger 100 partial fibre parallel to tensile axis at higher strains. However, in the latter, the Cube, A and Goss Twin (GT)-type textures were dominated. Decreasing of the Goss and S components were attributed to the preferential transformation of austenite to alpha' - and epsilon martensites, respectively. The presence of GT component even at higher strains approved the participation of deformation induced twinning as a dominant deformation mechanism up to failure.
机译：研究了在室温应变下，孪生孪生诱导塑性钢中马氏体相变，孪晶和位错亚结构形成的连续演化过程。通过使用电子背散射衍射方法的微观结构观察和微观纹理检查，可以实现这一点。为了评估热机械加工钢的应变硬化行为，在环境温度下对不同应变进行了拉伸测试程序。结果表明，位错滑移，机械孪晶和变形引起的ε/α'马氏体形成是变形机理。在变形的早期，位错亚结构的动态形成，应变诱发的ε-马氏体和奥氏体的孪晶在观察到的工作硬化行为中起主要作用。此外，结果表明，α'马氏体的形成是较高变形水平下的主要变形机制。相应的织构分析表明形成了双重纤维织构，在较低应变下具有相对较强的<111>，在较高应变下具有平行于拉伸轴的较强的<100>局部纤维。但是，在后者中，Cube，A和Goss Twin（GT）型纹理占主导。高斯和硫组分的减少分别归因于奥氏体分别优先转变为α'-和ε马氏体。即使在较高的应变下，GT组分的存在也证明了变形诱导孪生的参与是直至失效的主要变形机制。

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