摘要
为揭示贝氏体相变机制及外加应力对它的影响,采用透射电镜研究了140MPa的外加拉应力对中碳低合金钢35MV7的450°C等温贝氏体相变组织形貌的影响.研究发现,由于外加应力的存在,贝氏体相变基元及其组成的铁素体条的尺寸变得非常粗大并形成多样的变态.这种尺寸的变化是由于外加应力产生额外的相变驱动力,使相变基元块可以克服更大的弹性应变能而长成更大的体积.
Study of effects of tensile stress of 140 MPa on isothermal bainitic transformation product was conducted in this paper using transmission electronic microscopy. It was found that bainitic transformation units and ferrite plates which these units form, are much coarsened and their morphologies are greatly modified under the influence of this external stress. Attempt was made thermodynamically to explain that, the extra driven force for phase transformation provided by the external stress can help bainitic transformation units overcome more elastic strain energy in growth and result in larger final volume.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2005年第3期251-253,共3页
Materials Science and Technology
