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Influence of Isothermal Transformation Temperature on Microstructure and Mechanical Properties of C-Si-Mn TRIP Steel

Xiong Ai-min

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Abstract

The influence of isothermal transformation temperature on microstrucure and mechanical properties in 0.11C-1.23Si-1.65Mn cold rolling TRIP(Transformation Induced Plasticity) steel sheets was investigated by using optical microscopy and X-ray diffraction method.The maximal volume fraction of retained austenite,which is 6.55%,is obtained by heat treatment of 840 ℃×180 s+420 ℃×240 s.The best product of strength and ductility,which is 2.28×104 MPa·%,is also obtained by this heat treatment process.The performance of the material can be increased by increasing intercritical annealing time properly at 840 ℃.

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What this paper is about

The influence of isothermal transformation temperature on microstrucure and mechanical properties in 0.11C-1.23Si-1.65Mn cold rolling TRIP(Transformation Induced Plasticity) steel sheets was investigated by using optical microscopy and X-ray diffraction method.The maximal volume fraction of retained austenite,which is 6.55%,is obtained by heat treatment of 840 ℃×180 s+420 ℃×240 s.The best product of strength and ductility,which is 2.28×104 MPa·%,is also obtained by this heat treatment process.The performance of the material can be increased by increasing intercritical annealing time properly at 840 ℃.

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Available abstract

The influence of isothermal transformation temperature on microstrucure and mechanical properties in 0.11C-1.23Si-1.65Mn cold rolling TRIP(Transformation Induced Plasticity) steel sheets was investigated by using optical microscopy and X-ray diffraction method.The maximal volume fraction of retained austenite,which is 6.55%,is obtained by heat treatment of 840 ℃×180 s+420 ℃×240 s.The best product of strength and ductility,which is 2.28×104 MPa·%,is also obtained by this heat treatment process.The performance of the material can be increased by increasing intercritical annealing time properly at 840 ℃.

Key concepts: Materials science, TRIP steel, Austenite, Microstructure, Isothermal process, Volume fraction, Annealing (glass), Metallurgy

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