东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2011, Vol. 32 ›› Issue (11): 1566-1569.DOI: -

• 论著 • 上一篇    下一篇

热轧DP钢横截面性能分布预测

蔡晓辉;刘旭辉;刘振宇;刘学凯;   

  1. 东北大学轧制技术及连轧自动化国家重点实验室;
  • 收稿日期:2013-06-19 修回日期:2013-06-19 发布日期:2013-04-04
  • 通讯作者: -
  • 作者简介:-
  • 基金资助:
    高等学校博士学科点专项科研资金资助项目(20090042120004)

Prediction of property distribution on the cross section of hot rolled DP steels

Cai, Xiao-Hui (1); Liu, Xu-Hui (1); Liu, Zhen-Yu (1); Liu, Xue-Kai (1)   

  1. (1) State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China
  • Received:2013-06-19 Revised:2013-06-19 Published:2013-04-04
  • Contact: Cai, X.-H.
  • About author:-
  • Supported by:
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摘要： 选用有限差分方法计算带钢冷却过程中的温度场和温降曲线.在试验得到TTT曲线的前提下,应用Scheil定律和经典Avrami方程推导CCT曲线.在此基础上耦合温度场和相变过程来模拟轧件横截面的铁素体分布;由组织性能关系模型模拟轧件横截面上的性能分布,如屈服强度和抗拉强度.采用超快冷工艺分段冷却方式在现场生产低成本高性能的DP钢,获得低屈强比的DP700,铁素体晶粒约5~6μm,力学性能满足要求.断面上的组织分布预测可用来调整冷却路线,降低生产成本的同时提高生产效率.

关键词: 热轧, DP钢, 性能分布, 温度场, 相变

Abstract: The finite differential method was applied to calculating the temperature field and temperature curve of the cooling process of strip. Based on the experimental TTT curve, the CCT curve was deduced from Scheil's rule and Avrami equation. Then the temperature field and the phase transformation process were coupled to predict the ferrite grain distribution on the cross section of the strip. With the microstructure-property models the mechanical property distribution on the cross section, e.g. yield/tension strength, was calculated. The UFC (ultra fast cooling) technology and stepped cooling mode were applied to producing DP (dual phase) steels with low cost and good quality on site. The produced DP steels showed the low yield ratio, the tensile strength of 700 MPa and the ferrite grain size of 5~6 μm. This design process, adapting the cooling route based on the simulation results of the microstructure distribution, can decrease the production cost and increase the production efficiency.

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