Effect of Different Heat Treatment Processes on Microstructure Evolution and Tensile Properties of Hot-Rolled Medium-Mn
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ORIGINAL ARTICLE
Effect of Different Heat Treatment Processes on Microstructure Evolution and Tensile Properties of Hot-Rolled Medium-Mn Steel Chunquan Liu1 • Qichun Peng1
•
Zhengliang Xue1 • Jianli Li1 • Chengwei Yang2
Received: 10 October 2019 / Accepted: 29 April 2020 Ó The Indian Institute of Metals - IIM 2020
Abstract The effects of different heat treatment processes on microstructure evolution and tensile properties of Fe0.11C-5.23Mn-1.11Al-0.10Si medium-Mn steel were investigated. The uniaxial tensile properties of tension specimens after heat treatment were tested, and the relationship between different annealed microstructures and tensile properties was analyzed; furthermore, the optimum heat treatment parameters were explored. Besides, the water-quenched sample exhibited an extensive TRIP effect than the furnace-cooled sample. The optimum microstructure and mechanical properties can be obtained when the sample is intercritically annealed at 625 °C for 4 h and then water-quenched. At the same time, the work hardening rate of the experimental steel is expounded, which provides theoretical reserve and technical support for the practical application of this kind of steel.
& Qichun Peng [email protected] Chunquan Liu [email protected] Zhengliang Xue [email protected] Jianli Li [email protected] Chengwei Yang [email protected] 1
The State Key Laboratory of Refractories and Metallurgy, Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China
2
Wuhan Baosteel Central Research Institute, Wuhan 430083, China
Keywords Intercritical annealing Medium-Mn steel Retained austenite Tensile properties
1 Introduction In recent years, considering the economics and production feasibility, medium-Mn steel (3–12 wt% Mn) has become a promising automotive steel with its excellent comprehensive properties [1–6]. The third-generation advanced high-strength steel (AHSS) for automobiles is based on further improving the strength and plasticity for the firstgeneration AHSS, while reducing the alloy content of the second-generation AHSS, thereby filling the gap between the mechanical properties of the first- and second-generation AHSS and reducing the production cost [7, 8]. The matching of high strength and high plasticity is achieved by using body-centered cubic (BCC) as matrix structure and metastable austenite with face-centered cubic (FCC) structure for third-generation AHSS, wherein the metastable austenite content is [ 20% and the product of strength and elongation (PSE) is [ 30 GPa% [9–11]. Medium-Mn steel, a kind of HASS, has a larger content of metastable retained austenite (RA), which partially or totally undergoes transformation-induced plasticity (TRIP) during deformation process to improve strength and plasticity [1, 3]. Since the TRIP effects can postpone necking during the stretching process, its elongation is greatly increased [12]. Meanwhile, a new phase martensite is formed to
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