1 School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China 2 The Center of Analysis Measurement, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China 3 National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China 4 School of Materials Science and Engineering, Liaoning University of Technology, Jinzhou 121001, Liaoning, China
Parameters optimization design of quenching and partitioning for best combination between strength and ductility using orthogonal experimental design
1 School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China 2 The Center of Analysis Measurement, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China 3 National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China 4 School of Materials Science and Engineering, Liaoning University of Technology, Jinzhou 121001, Liaoning, China
摘要 Quenching and partitioning (Q&P) which provides a balance between toughness and strength is a promising heat treatment in iron and steel industry. However, there are three parameters (quenching temperature, partitioning temperature and partitioning time) which affect the properties dramatically. As a result, it remains a challenge to get the best parameters in a low-cost way for Q&P process. Here, the orthogonal experimental design combined with a local optimization was adopted to optimize the quenching and partitioning parameters of 65Si2MnWA steel. By using this method, the combination between strength and ductility was optimized; meanwhile, the number of experiments was reduced significantly. When treated by quenching at 180 C followed by partitioning at 330 C for 20 min, the steel reached the best combination between strength and ductility. In detail, the product of ultimate tensile strength and reduction in area was 1.36 times (from 64.9 to 88.8 GPa%) that treated by quenching and tempering. In addition, owing to the grain refinement, the strength and ductility increase simultaneously. Specifically, the reduction in area increased by 27.4% (from 35.8% to 45.6%) coupled with a little improvement in ultimate tensile strength (7.4%).
Abstract:Quenching and partitioning (Q&P) which provides a balance between toughness and strength is a promising heat treatment in iron and steel industry. However, there are three parameters (quenching temperature, partitioning temperature and partitioning time) which affect the properties dramatically. As a result, it remains a challenge to get the best parameters in a low-cost way for Q&P process. Here, the orthogonal experimental design combined with a local optimization was adopted to optimize the quenching and partitioning parameters of 65Si2MnWA steel. By using this method, the combination between strength and ductility was optimized; meanwhile, the number of experiments was reduced significantly. When treated by quenching at 180 C followed by partitioning at 330 C for 20 min, the steel reached the best combination between strength and ductility. In detail, the product of ultimate tensile strength and reduction in area was 1.36 times (from 64.9 to 88.8 GPa%) that treated by quenching and tempering. In addition, owing to the grain refinement, the strength and ductility increase simultaneously. Specifically, the reduction in area increased by 27.4% (from 35.8% to 45.6%) coupled with a little improvement in ultimate tensile strength (7.4%).
Ming-qing Liao,Zhong-hong Lai,Aorigele Bao, et al. Parameters optimization design of quenching and partitioning for best combination between strength and ductility using orthogonal experimental design[J]. Journal of Iron and Steel Research International, 2019, 26(10): 1088-1095.