上海交通大学学报

上海交通大学学报（自然版）

• 金属学与金属工艺 • 上一篇    下一篇

SPHC钢应变诱导相变细化铁素体晶粒

伍来智,陈军,张鸿冰,崔振山   

  1. SPHC钢应变诱导相变细化铁素体晶粒伍来智,陈军,张鸿冰,崔振山（上海交通大学 塑性成形工程系， 上海 200030）摘要： 以SPHC钢为对象，在Gleeble1500型热模拟机上进行单道次热压缩试验，通过分析变形后的应力与应变曲线及变形过程中的金相组织变化，研究应变诱导相变的基本规律及铁素体晶粒细化效果.结果表明：在750~830 ℃的变形中存在应变诱导铁素体相变，并获得超细晶铁素体晶粒尺寸为1.6~4.6 μm；降低变形温度将增加相变所需化学驱动力，促进应变诱导铁素体相变的发生，从而细化铁素体晶粒；在一定的应变条件下，应变诱导相变获得的铁素体晶粒尺寸和体积分数均随应变速率的增加而减少.关键词： 超细晶; 应变诱导铁素体相变; SHPC钢
  • 收稿日期:2009-06-22 修回日期:1900-01-01 出版日期:2010-01-29 发布日期:2010-01-29

Ferrite Grain Refinement through Strain Induced Transformation in SPHC Steel

WU Laizhi,CHEN Jun,ZHANG Hongbing,CUI Zhenshan

  

  1. (Department of Plasticity Technology, Shanghai Jiaotong University, Shanghai 200030, China)
  • Received:2009-06-22 Revised:1900-01-01 Online:2010-01-29 Published:2010-01-29

摘要： 以SPHC钢为对象，在Gleeble1500型热模拟机上进行单道次热压缩试验，通过分析变形后的应力与应变曲线及变形过程中的金相组织变化，研究应变诱导相变的基本规律及铁素体晶粒细化效果.结果表明：在750~830 ℃的变形中存在应变诱导铁素体相变，并获得超细晶铁素体晶粒尺寸为1.6~4.6 μm；降低变形温度将增加相变所需化学驱动力，促进应变诱导铁素体相变的发生，从而细化铁素体晶粒；在一定的应变条件下，应变诱导相变获得的铁素体晶粒尺寸和体积分数均随应变速率的增加而减少.

关键词: 超细晶, 应变诱导铁素体相变, SHPC钢

Abstract: The single hot compression tests of SPHC steel were performed using a Gleeble1500 thermomechanical simulator. The characteristics of strain induced transformation and ferrite grain refinement were investigated through analyzing the stressstrain curves and metallographic structures. The results show that very fine ferrite grains of about 1.6~4.6 μm can be obtained by the deformation at 750~830 ℃, due to the occurrence of SIFT. Decreasing deformation temperature leads to increase the chemical driving force for austenitetoferrite transformation and thus leads to refine ferrite grain. The size and volume fraction of ferrite grains decrease with increasing strain rate at the same strain level.

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