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| Retained Austenite Transformation in Tensile Process for Annealed Martenite Matrix TRIP Steel |
| ZHANG Ming-ya,ZHU Fu-xian,DUAN Zheng-tao,ZENG Zhou-yu |
| （State Key Lab of Rolling and Automation, Northeastern University， Shenyang 110004, Liaoning, China） |
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Abstract The transformation of retained austenite (RA) to martenite of cold rolled annealed martenite (AM) matrix TRIP steel in different pre-tensions was investigated. The 1mm/min tensile rate was adopted for fully transformation. The transformation volume fractions of RA and carbon concentration in RA were calculated quantitatively by X-ray diffractometer (XRD) analysis, the fracture morphology was also analyzed by scanning electron microscope (SEM). The results indicate that, the RA transformation and strains have close relationship. The transformation rates of initial stage and just before fracture are much lower than that of uniform deformation stage. From 5% elongation to necking stage, RA transforms into martenite stably and the transformation rate reaches to its maximum. The uniform elongation could be enhanced in this stage. When necking occurred, RA transforms into martenite continuously, but the transformation rate is slightly lower than uniform transformation stage. In the whole deformation process, carbon concentration in RA increases linearly. Although they are the maximum gradients of stress and strain, the transformation rates of initial and last stages are not maximum, but minimum.
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Received: 07 March 2011
Published: 27 June 2012
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2012, Vol. 47 
