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Research on Continuous Cooling Transformation and Microstructure of C-Si-Al TRIP Steel

Tang Di

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Abstract

The CCT curves of C-Si-Al TRIP steel were measured under different cooling speeds using thermal simulator instrument DIL805A,the phase transition point of C-Mn-Al TRIP steel was calculated using Thermo-Calc software. According to metallographic analysis,the microstructure of the sample was researched. The results show that when the cooling rate is above 0.5 ℃/s,the microstructure is made up of abundance pro-eutectoid ferrite,a little pearlite and carbon-free bainite; while the cooling rate is above 5 ℃/s,ferrite and carbon-free bainite are obtained; there are martensite and bainite in microstructure at above 10℃/s.

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What this paper is about

The CCT curves of C-Si-Al TRIP steel were measured under different cooling speeds using thermal simulator instrument DIL805A,the phase transition point of C-Mn-Al TRIP steel was calculated using Thermo-Calc software. According to metallographic analysis,the microstructure of the sample was researched. The results show that when the cooling rate is above 0.5 ℃/s,the microstructure is made up of abundance pro-eutectoid ferrite,a little pearlite and carbon-free bainite; while the cooling rate is above 5 ℃/s,ferrite and carbon-free bainite are obtained; there are martensite and bainite in microstructure at above 10℃/s.

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Available abstract

The CCT curves of C-Si-Al TRIP steel were measured under different cooling speeds using thermal simulator instrument DIL805A,the phase transition point of C-Mn-Al TRIP steel was calculated using Thermo-Calc software. According to metallographic analysis,the microstructure of the sample was researched. The results show that when the cooling rate is above 0.5 ℃/s,the microstructure is made up of abundance pro-eutectoid ferrite,a little pearlite and carbon-free bainite; while the cooling rate is above 5 ℃/s,ferrite and carbon-free bainite are obtained; there are martensite and bainite in microstructure at above 10℃/s.

Key concepts: Bainite, Microstructure, Pearlite, Continuous cooling transformation, TRIP steel, Ferrite (magnet), Materials science, Metallurgy

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