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Effect of process parameters on Microstructure Evolution and properties of hot-rolled dual phase steel Containing Nb and Ti

机译：工艺参数对含Nb和Ti的热轧双相钢组织演化与性能的影响

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The effect of process parameters such as deformation temperature,cooling rate,holding temperature,and holding time on Microstructure Evolution and properties of dual phase steel containing Nb-Ti was researched by using MMS-300 thermo-mechanical simulator.The results show that the ferrite content rises and the martensite morphology evolutes from block to island with deformation temperature reduced; as the cooling rate before holding rises,the volume fraction of ferrite and hardness increases; while the holding temperature gradually drops to 580oC from 740°C for 10s,the amount of ferrite transformation firstly increases and then decreases,and is largest at 660 °C(about 94％),but the bainite appears at 620oC; the relationship curve of the amount of ferrite transformation and the holding time presents “S” model when the holding temperature is 700oC and 660°C,and the ferrite transformation velocity at 660°C is higher than 700°C.This research lays a foundation for making technology of hot-rolled Nb-Ti dual phase steel.
机译：使用MMS-300热机械模拟器研究了工艺参数如变形温度，冷却速率，保持温度和保持时间对含有NB-TI的双相钢的性能的影响。结果表明了铁氧体内容升高和马氏体形态从块到岛屿的变形温度降低;随着在保持之前的冷却速率上升，铁氧体和硬度的体积分数增加;虽然保持温度从740℃逐渐降至580℃，但铁氧体转化的量首先增加然后减少，并且最大在660℃（约94％），但贝氏体出现在620℃。当保持温度为700℃和660℃时，铁氧体变换量和保持时间的关系曲线提出了“S”模型，并且660℃的铁氧体转化速度高于700°C。本研究奠定了基础用于制造热轧NB-TI双相钢技术。

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