• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2017, Vol. 53 ›› Issue (8): 75-81.doi: 10.3901/JME.2017.08.075

• • 上一篇    下一篇

非均匀温度场下变梯度特性热成形技术研究

孔玲, 刘才溢, 彭艳   

  1. 燕山大学国家冷轧板带装备及工艺工程技术研究中心 秦皇岛 066004
  • 出版日期:2017-04-15 发布日期:2017-04-15
  • 作者简介:

    孔玲,女,1981年出生,博士研究生,实验师。主要研究方向为金属塑性变形。

    E-mail:kongling@ysu.edu.cn

    彭艳(通信作者),男,1971年出生,博士,教授,博士研究生导师。主要研究方向为金属塑性变形。

    E-mail:pengyan@ysu.edu.cn

  • 基金资助:
    * 河北省高等学校高层次人才科学研究资助项目(GCC2014039); 20160405收到初稿,20161209收到修改稿;

Study on Variable Gradient Characteristics Hot Forming Under Non-uniform Temperature Field

KONG Ling, LIU Caiyi, PENG Yan   

  1. National Engineering Research Center for Equipment and Technology of Cold Strip Rolling,Yanshan University, Qinhuangdao 066004
  • Online:2017-04-15 Published:2017-04-15

摘要:

传统的热成形工艺所得制件虽具有超高强度,但塑性通常较低,且成形件各部位的力学性能相同,综合力学性能不高,难以满足日益增加的变梯度特性热成形制件的需求。对变梯度热成形技术进行较为深入的研究。利用有限元法分析非均匀温度场下板料热冲压过程,并通过试验揭示非均匀温度场下热成形过程中微观组织的演变规律及其对材料性能渐变性的影响。利用金属固态相变原理中不同的微观组织条件下成形件的力学性能不同,研究钢板热成形过程中板料初始非均匀温度场引起的板料微观组织分布状态,得到分别为铁素体、珠光体组织;铁素体、珠光体、马氏体混合组织;马氏体组织梯度渐变的微观组织形态。这种通过建立板料非均匀温度场达到材料微观组织渐变分布、性能梯度分布的工艺显著提高了成形件的综合力学性能,为深入探讨热成形技术提供了新的研究方向,扩宽了热成形制件的范畴。

关键词: 非均匀温度场, 性能梯度分布, 热成形

Abstract:

The traditional hot forming product has high strength, but the plasticity is usually low, and the mechanical properties are always same, comprehensive mechanical performance is not high. It is difficult to meet the increasing requires of the variable gradient characteristics of hot forming parts. The variable gradient hot forming technology is thoroughly studied. The hot stamping process of sheet under non-uniform temperature field is analyzed by the MARC software and the evolution law and its influencing factors of hot forming process are revealed by experiments. By using the principle of metal solid phase, the mechanical properties of the formed parts are different under different microstructures. The microstructure distribution of sheet is discussed in the hot forming under non-uniform temperature field and a gradient mixed microstructure of ferrite-pearlite, ferrite-pearlite-martensite and martensite is obtained by establishing the non-uniform temperature field. The hot forming under non-uniform temperature field improves the comprehensive mechanics performance of the forming parts greatly, it provides a new research direction for hot forming technology and widens the hot forming parts category.

Key words: non-uniform temperature field, performance gradient distribution, hot forming