Effect of two-step cooling process on mechanical properties of TRIP steel with high performance
M.L. Li1,2 ? H. Jiang1,2 ? Y.L. He1,2 ? L.B. Chen1,2 ? G.T. Zhang3 ? H. Wang1 ? X.G. Lu1,2 ? L. Li1,2
1 School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China 2 State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200072, China 3 Pangang Group Research Institute, Panzhihua 617000, Sichuan, China
Effect of two-step cooling process on mechanical properties of TRIP steel with high performance
M.L. Li1,2 ? H. Jiang1,2 ? Y.L. He1,2 ? L.B. Chen1,2 ? G.T. Zhang3 ? H. Wang1 ? X.G. Lu1,2 ? L. Li1,2
1 School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China 2 State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200072, China 3 Pangang Group Research Institute, Panzhihua 617000, Sichuan, China
ժҪ A novel two-step cooling experiment was established to simulate the slow cooling process of continuous annealing production line for transformation-induced plasticity (TRIP) steel. The microstructures and mechanical properties of TRIP steel soaked at 700 ��C for different time were investigated by tensile test, scanning electron microscopy, X-ray diffraction, and thermodynamic and kinetic calculation. It is shown that the steel soaked for 15 s exhibits the optimal product of strength and elongation (PSE > 30,000 MPa%) due to the transformation of austenite to proeutectoid ferrite, which delays the bainite transformation and improves the stability of retained austenite. In addition, the mechanical properties of TRIP steel soaked over 30 s are much lower, resulting from the precipitation of cementite, which decreases the stability of retained austenite and weakens the TRIP effect.
Abstract��A novel two-step cooling experiment was established to simulate the slow cooling process of continuous annealing production line for transformation-induced plasticity (TRIP) steel. The microstructures and mechanical properties of TRIP steel soaked at 700 ��C for different time were investigated by tensile test, scanning electron microscopy, X-ray diffraction, and thermodynamic and kinetic calculation. It is shown that the steel soaked for 15 s exhibits the optimal product of strength and elongation (PSE > 30,000 MPa%) due to the transformation of austenite to proeutectoid ferrite, which delays the bainite transformation and improves the stability of retained austenite. In addition, the mechanical properties of TRIP steel soaked over 30 s are much lower, resulting from the precipitation of cementite, which decreases the stability of retained austenite and weakens the TRIP effect.
M.L. Li, ? H. Jiang, ? Y.L. He, ? L.B. Chen, ? G.T. Zhang ? H. Wang ? X.G. Lu, ? L. Li,. Effect of two-step cooling process on mechanical properties of TRIP steel with high performance[J].Journal of Iron and Steel Research International, 2018, 25(4): 426-432.
M.L. Li, ? H. Jiang, ? Y.L. He, ? L.B. Chen, ? G.T. Zhang ? H. Wang ? X.G. Lu, ? L. Li,. Effect of two-step cooling process on mechanical properties of TRIP steel with high performance. , 2018, 25(4): 426-432.
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2018, Vol. 25 
