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Microstructure and Property of Cold Rolled DP800 Dual-phase Steel Containing Cr

Guohui Zhu

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Abstract

Cold rolled C-Mn and C-Mn-Cr dual-phase steels were designed,The dependence of mechanical proper-ties of the steels on their dual-phase structure with different volume ratios of ferrite to martensite was investigated after being heat treated at the temperatures in two-phase region.The results show that C-Mn-Cr steel heated at 770 ℃ for 5 min,slowly cooled at 10 ℃/min to 690 ℃ and then water cooled will be composed of the ferrite with mean grain size of 6.8 μm and about 31vol% martensite,and will reach such good mechanical properties as tensile strength of 825 MPa,yield strength of 451 MPa and elongation percentage of 15.4%.

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What this paper is about

Cold rolled C-Mn and C-Mn-Cr dual-phase steels were designed,The dependence of mechanical proper-ties of the steels on their dual-phase structure with different volume ratios of ferrite to martensite was investigated after being heat treated at the temperatures in two-phase region.The results show that C-Mn-Cr steel heated at 770 ℃ for 5 min,slowly cooled at 10 ℃/min to 690 ℃ and then water cooled will be composed of the ferrite with mean grain size of 6.8 μm and about 31vol% martensite,and will reach such good mechanical properties as tensile strength of 825 MPa,yield strength of 451 MPa and elongation percentage of 15.4%.

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Available abstract

Cold rolled C-Mn and C-Mn-Cr dual-phase steels were designed,The dependence of mechanical proper-ties of the steels on their dual-phase structure with different volume ratios of ferrite to martensite was investigated after being heat treated at the temperatures in two-phase region.The results show that C-Mn-Cr steel heated at 770 ℃ for 5 min,slowly cooled at 10 ℃/min to 690 ℃ and then water cooled will be composed of the ferrite with mean grain size of 6.8 μm and about 31vol% martensite,and will reach such good mechanical properties as tensile strength of 825 MPa,yield strength of 451 MPa and elongation percentage of 15.4%.

Key concepts: Materials science, Martensite, Microstructure, Ferrite (magnet), Ultimate tensile strength, Dual-phase steel, Elongation, Metallurgy

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Microstructure and Property of Cold Rolled DP800 Dual-phase Steel Containing Cr — Research Paper | ScholarLens