Effect of Isothermal Compression on Martensite Transformation and Microstructure of High Strength Automobile Steel WHT1300HF

LIU Kai,,CHI Bo,PU Jian,LI Jian

Journal of Iron and Steel Research ›› 2014, Vol. 26 ›› Issue (8) : 69-74.

Journal of Iron and Steel Research ›› 2014, Vol. 26 ›› Issue (8) : 69-74. DOI: 10.13228/j.boyuan.issn1001-0963.20130319

Effect of Isothermal Compression on Martensite Transformation and Microstructure of High Strength Automobile Steel WHT1300HF

  • LIU Kai1,2,CHI Bo1,PU Jian1,LI Jian1
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Abstract

By utilizing the isothermal deformation, the effect of the deformation parameters (deformation temperature, strain rate, deformation amount) on the phase transformation and microstructure of the high strength automobile steel WH1300HF was investigated. The results show that increasing the isothermal deformation amount of the austenite is conducive to the defect nucleation of the ferrite, promotes the ferrite transformation of the deformed austenite, and the deformation strengthening of the austenite lead to the increasing of the resistance of martensite transformation, which causes the decreasing of Ms, the increasing of the number of small-angle grain boundaries and the number of the small grains. Increasing the isothermal deformation (40%) rate of the austenite promotes the martensite transformation and the ferrite transformation, but, the volume fraction of martensite and the number of small-angle grain boundaries are reduced, and the number of the small grains is increased. Reducing the isothermal deformation temperature intensifies the deformation strengthening of the austenite and results in the decreases of Ms, volume fraction of martensite and the proportion of the small-angle grain boundaries and significant increases of the number of the small grains and the amount of the ferrite.

Key words

high strength steel / isothermal deformation / small-angle grain boundary / microstructure / martensite phase transformation temperature

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LIU Kai,,CHI Bo,PU Jian,LI Jian. Effect of Isothermal Compression on Martensite Transformation and Microstructure of High Strength Automobile Steel WHT1300HF[J]. Journal of Iron and Steel Research, 2014, 26(8): 69-74 https://doi.org/10.13228/j.boyuan.issn1001-0963.20130319

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