首页> 外文会议>International Conference on Microalloying for New Steel Processes and Applications; 20050907-09; Basque Country(ES) >In Situ X-ray Diffraction Measurements of Deformation-Induced Austenite to Martensite Transformation in a Multiphase TRIP Steel
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In Situ X-ray Diffraction Measurements of Deformation-Induced Austenite to Martensite Transformation in a Multiphase TRIP Steel

机译:多相TRIP钢中形变诱发奥氏体向马氏体转变的原位X射线衍射测量

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摘要

Deformation-induced retained austenite to martensite transformation is often regarded as the main contribution to the TRIP (transformation induced elasticity) effect. In this work, the transformation in an aluminum-bearing TRIP steel, 0.17C-1.46Mn-0.26Si-1.81Al (wt.%), is studied by means of in situ X-ray diffraction (XRD) measurements performed during uniaxial straining. The XRD patterns are analyzed by profile fitting and important information with respect to martensitic transformation under stress is revealed: presence of phases, volume fraction of retained austenite, lattice spacing and dislocation density. It is found that the volume fraction of retained austenite decreases with increasing strain according to a hyperbolic relation previous proposed in the literature. Inhomogeneity of carbon concentration over the austenitic phase is suggested as the major factor controlling the degree of the transformation in comparison with dislocation density in the ferrite matrix.
机译:变形引起的残余奥氏体向马氏体相变通常被认为是TRIP(相变诱导弹性)效应的主要贡献。在这项工作中,通过在单轴应变过程中进行的原位X射线衍射(XRD)测量研究了含铝TRIP钢0.17C-1.46Mn-0.26Si-1.81Al(wt。%)的转变。通过轮廓拟合分析了XRD图谱,并揭示了应力下有关马氏体相变的重要信息:相的存在,残余奥氏体的体积分数,晶格间距和位错密度。根据文献中先前提出的双曲线关系,发现残余奥氏体的体积分数随着应变的增加而减小。与铁素体基体中的位错密度相比,奥氏体相中碳浓度的不均匀性被认为是控制相变程度的主要因素。

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