Effect of processing parameters on crystal orientation of microstructure in high niobium-bearing microalloyed steel

摘要：

The present studies are aimed at understanding the effect of cooling rate and prior strain on the evolution of morphology, orientation relationship (OR) and variant selection in pipeline steel with 0.09wt％ niobium. In identical prior austenite grain, all products include granular bainite(GB) by coherent transformation, keep orientation relationship (OR) with parent austenite. Fast cooling and large deformation below Tnr both can raise drive force of coherent transformation and weaken variants selection, and it can generate higher frequency of high angle boundaries (HABs) (≥15degree). Moreover,large deformation by few passes below Tnr can accelerate nucleation of ferrite grains at the austenite boundary by incoherent transformation. These fine grains havent OR with prior austenite grain in any side of boundary, and exhibit significant misorientations between themselves.

关键词： Orientation relationship EBSD low carbon bainite microalloyed steel ferrite grain

作者: SHANG Chengjia Miao Chengliang S.V. Subramanian

作者单位: University of Science and Technology Beijing, Beijing, China McMaster University, Hamilton, Ontario, Canada

会议类型: 国际会议

会议名称: The 6th International Conference on High Strength Low Alloy Steels(第六届高强度低合金钢国际会议HSLA Steels2011)

会议地点: 北京

会议语种:英文

页码: 789-793

在线出版日期: 2011-05-31（万方平台首次上网日期，不代表论文的发表时间）