Microstructural evolution during bainite transformation in a vanadium microalloyed TRIP-assisted steel
Microstructural evolution during bainite transformation in a vanadium microalloyed TRIP-assisted steel
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DOI：
10.1016/j.msea.2015.11.024
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发表时间：
2016-01-10
期刊：
影响因子：
6.4
通讯作者：
Rainforth, W. M.
中科院分区：
文献类型：
--
作者：
Abbasi, E.;Rainforth, W. M.
研究了冷轧0.12wt%V微合金化相变诱导塑性辅助钢经亚温退火后的组织演变和后续性能，重点研究了460 ℃等温贝氏体相变。通过光学显微镜、扫描透射电子显微镜和显微分析、X射线衍射分析和拉伸试验对热处理钢进行了检查。拉伸试验表明，随着等温贝氏体保持时间的延长（即180 s），屈服强度和总伸长率有相当大的改善。根据显微镜观察，这些效果归因于薄膜型残留奥氏体和新形成的位错作为贝氏体转变的结果，人口的增加。在等温贝氏体转变过程中没有观察到明显的V（C，N）析出和长大粗化，这与常规钒微合金化钢一致。而位错缠结中的V（C，N）析出相则可能对钢的拉伸性能有一定的影响。(c)2015 Elsevier B.V.版权所有。
The microstructural evolution and subsequent properties of a cold rolled 0.12 wt% V microalloyed transformation induced plasticity assisted steel were studied after intercritical annealing, focusing on isothermal bainite transformation at 460 degrees C. The heat treated steel was examined by optical microscopy, scanning-transmission electron microscopy and microanalysis, X-ray diffraction analysis and tensile testing. The tensile testing showed considerable improvements in yield strength and total elongation with longer isothermal bainite holding times (i.e. 180 s). According to microscopy observations, these effects were attributed to the increase in the population of film-type retained austenite and newly formed dislocations as a result of bainite transformation. No significant V(C,N) precipitation and growth-coarsening were observed during isothermal bainite transformation, which is consistent with conventional vanadium microalloyed steels. However, the V(C,N) precipitates in dislocation tangles suggested the possible contribution of precipitates on the tensile properties of steel. (c) 2015 Elsevier B.V. All rights reserved.