中国机械工程 ›› 2023, Vol. 34 ›› Issue (04): 475-480,489.DOI: 10.3969/j.issn.1004-132X.2023.04.012

• 先进材料加工工程 • 上一篇    下一篇

脉冲电流辅助SUS304极薄带拉伸变形研究

范婉婉1,2;刘奇1,2;刘文文1,2;王涛1,2;王天翔3   

  1. 1.太原理工大学机械与运载工程学院,太原,030024
    2.太原理工大学先进成形与智能装备研究院,太原,030024
    3.山西太钢不锈钢精密带钢有限公司,太原,030024
  • 出版日期:2023-02-25 发布日期:2023-03-17
  • 通讯作者: 王涛(通信作者),男,1985年生,教授。研究方向为轧制工艺与设备及金属塑性成形。E-mail:twang@tyut.edu.cn。
  • 作者简介:范婉婉,女,1995年生,博士研究生。研究方向为极薄带塑性成形。E-mail:tyutfww@163.com。
  • 基金资助:
    国家自然科学基金(51974196);山西省重点研发项目(201903D421047);山西省科技重大专项(20181102015);山西省研究生教育创新项目(2021Y166);创新型人才国际合作培养项目(CXXM20200144)

Research on Pulse Current-assisted Tensile Deformation of SUS304 Ultra-thin Strips

FAN Wanwan1,2;LIU Qi1,2;LIU Wenwen1,2;WANG Tao1,2;WANG Tianxiang3   

  1. 1.College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan,030024
    2.Advanced Forming and Intelligent Equipment Research Institute,Taiyuan University 
    of Technology,Taiyuan,030024
    3.Shanxi Taigang Stainless Steel Precision Strip Co.,Ltd.,Taiyuan,030024
  • Online:2023-02-25 Published:2023-03-17

摘要: 为了研究脉冲电流对SUS304极薄带拉伸变形的影响,进行了室温拉伸、通电拉伸以及通电空冷拉伸试验,分析了热效应和非热效应对宏观力学性能与微观组织的影响。结果表明,脉冲电流辅助SUS304极薄带拉伸变形过程中热效应和非热效应同时存在,热效应导致材料流变应力减小,非热效应抑制TRIP效应,促进TWIP效应,改变了材料的塑性变形机制;没有高强度马氏体协调塑性变形,导致试样过早发生失稳断裂,其中试样的抗拉强度降低12.2%,断裂延伸率下降44.7%;同时,非热效应使试样在较低温度下发生了回复和再结晶现象;脉冲电流诱导了SUS304极薄带由韧性断裂向韧脆性断裂模式的转变,并且促进了变形织构生成。

关键词: 电流辅助加工, SUS304极薄带, 拉伸变形, TRIP效应

Abstract: To study the effects of pulse current on the tensile deformations of SUS304 ultra-thin strips, room temperature tensile, electric tensile and electric air-cooled tensile tests were carried out. The effects of thermal effect and non-thermal effect on the macro-mechanics properties and microstructure were analyzed. The results show that thermal effect and non-thermal effect exist simultaneously in the processes of pulse current-assisted tensile deformation of SUS304 ultra-thin strips, and the thermal effect leads to the reduction of flow stress. The non-thermal effect restrains the TRIP effect, promotes the TWIP effect and changes the plastic deformation mechanism of the SUS304 ultra-thin strips. There is no coordinated plastic deformation of high-strength martensite, which leads to the premature plastic instability of samples, where the tensile strength of the sample decreases by 12.2% and the elongation at break decreases by 44.7%. The non-thermal effect makes the strip recover and recrystallize at a lower temperature. The pulse current induces the transition of SUS304 ultra-thin strips from ductile fracture to ductile-brittle fracture mode, and promotes the formation of deformed texture. 

Key words:  , electrically-assisted forming, SUS304 ultra-thin strip, tensile deformation, TRIP effect

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