东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2015, Vol. 36 ›› Issue (8): 1110-1115.DOI: 10.12068/j.issn.1005-3026.2015.08.011

• 材料与冶金 • 上一篇    下一篇

基于动态碳配分机制的高强塑积热成形钢研究

彭良贵1， 刘伟杰2， 刘相华1,2， 支颖1   

  1. (1. 东北大学 轧制技术及连轧自动化国家重点实验室， 辽宁 沈阳110819； 2.东北大学 研究院， 辽宁 沈阳110819)
  • 收稿日期:2014-07-04 修回日期:2014-07-04 出版日期:2015-08-15 发布日期:2015-08-28
  • 通讯作者: 彭良贵
  • 作者简介:彭良贵(1975-)，男，四川宣汉人，东北大学讲师，博士; 刘伟杰(1953-)，男，辽宁沈阳人，东北大学教授，博士生导师; 刘相华(1953-)，男，黑龙江双鸭山人，东北大学教授，博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(51034009); 中央高校基本科研业务费专项资金资助项目( N130407007).

Development of Hot-Stamping Steel with Large Product of Strength and Elongation Based on Dynamic Carbon Partitioning Mechanism

PENG Liang-gui1， LIU Wei-jie2， LIU Xiang-hua1,2， ZHI Ying1   

  1. 1. State Key Laboratory of Rolling and Automation， Northeastern University， Shenyang 110819， China; 2.Research Academy， Northeastern University， Shenyang 110819， China.
  • Received:2014-07-04 Revised:2014-07-04 Online:2015-08-15 Published:2015-08-28
  • Contact: PENG Liang-gui
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摘要： 通过直接淬火、Q&P、回火等工艺对一种低碳含铜钢进行热处理，并使用拉伸试验机、落锤冲击试验机、扫描电镜、电子探针、X射线衍射、透射电镜等手段对其力学性能、显微组织和冲击性能进行表征.在连续冷却淬火过程中观察到碳在马氏体和残余奥氏体间的动态配分现象，Q&P处理和低温回火可改善实验钢的冲击韧性；实验钢综合力学性能良好:强塑积大于20GPa%，抗拉强度超过1400MPa，延伸率约14%，室温冲击功高于40J.结果表明，所开发的实验钢可以满足热冲压工艺对成形淬火一体化的要求，可作为具有高强塑积的热成形用钢.

关键词: 动态碳配分, 残余奥氏体, 热成形, 强塑积, 冲击韧性

Abstract: A low-carbon steel with Cu addition was heat-treated by direct quenching， Q&P (quenching and partitioning) and tempering processes. The mechanical properties and impact toughness of the test steel were investigated by universal testing machine and drop weight impact testing machine. The microstructure was characterized by SEM (scan electron microscope)， EPMA(electron probe microanalysis)， XRD (X-ray diffraction) and TEM (transmission electron microscope). The results show that the phenomenon of dynamic carbon partitioning from martensite to retained austenite in the continuous cooling process is observed and the impact toughness of test steel is improved by Q&P process and tempering process. The test steel has a good comprehensive mechanical properties: the product of tensile strength and elongation， the tensile strength， the total elongation and the impact toughness at room temperature are 20GPa%，1400MPa， 14% and 40J， respectively. The test steel based on dynamic carbon partitioning mechanism can meet the requirement of hot-stamping process and can be used as an excellent hot stamping steel with high product of strength and elongation.

Key words: dynamic carbon partitioning, retained austenite, hot press forming, product of strength and elongation, impact toughness

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