J. Mater. Sci. Technol. ›› 1989, Vol. 5 ›› Issue (6): 415-420.

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The Study of Dual-phase Steel after Cyclic Deformation at Various Strain Amplitudes

SUN Zhengming;WANG Zhongguang;AI Suhua Institute of Metal Research, Academia Sinica, Shenyang, China. To whom correspondence should be addressed.   

  1. InstituteofMetalResearch,AcademiaSinica,Shenyang,China.Towhomcorrespondenceshouldbeaddressed;InstituteofMetalResearch,AcademiaSinica,Shenyang,China;InstituteofMetalResearch,AcademiaSinica,Shenyang,China
  • 收稿日期:1989-11-28 修回日期:1989-11-28 出版日期:1989-11-28 发布日期:2009-10-10

The Study of Dual-phase Steel after Cyclic Deformation at Various Strain Amplitudes

SUN Zhengming;WANG Zhongguang;AI Suhua Institute of Metal Research, Academia Sinica, Shenyang, China. To whom correspondence should be addressed.   

  • Received:1989-11-28 Revised:1989-11-28 Online:1989-11-28 Published:2009-10-10

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摘要： <正> Low cycle fatigue tests under plastic straincontrol were carried out with a dual-phase steelcontaining 23 Vol.-% martensite. Specimens hardenedrapidly at first few cycles followed by a slightsoftening to saturation stages when cycled athigher strain amplitudes, whereas at lower strainamplitudes the specimens presented continuallyhardening for a long time until saturation.TEM examination of the saturation dislocationstructures show that clusters, parallel wallsand cells were found at low, medium and highstrain amplitude, respectively. It also hasbeen found that the martensite/ferrite interfacesdid not affect the dislocation structures signi-ficantly when a specimen was fatigued at lowerstrain amplitude. However, the dislocation struc-ture adjacent to the two-phase boundary is dif-ferent to some extent from that in the remoteregions in the ferrite when a higher strainamplitude is applied.

Abstract: Low cycle fatigue tests under plastic strain control were carried out with a dual-phase steel containing 23 Vol.-% martensite. Specimens hardened rapidly at first few cycles followed by a slight softening to saturation stages when cycled at higher strain amplitudes, whereas at lower strain amplitudes the specimens presented continually hardening for a long time until saturation. TEM examination of the saturation dislocation structures show that clusters, parallel walls and cells were found at low, medium and high strain amplitude, respectively. It also has been found that the martensite/ferrite interfaces did not affect the dislocation structures signi- ficantly when a specimen was fatigued at lower strain amplitude. However, the dislocation struc- ture adjacent to the two-phase boundary is dif- ferent to some extent from that in the remote regions in the ferrite when a higher strain amplitude is applied.

Key words: cyclic deformation, dual-phase steel, dislocation structure