The present article aims at elucidating the effect of thermo-mechanical controlled processing(TMCP), especially the finish cooling temperature, on microstructure and mechanical properties of high strength low alloy st...The present article aims at elucidating the effect of thermo-mechanical controlled processing(TMCP), especially the finish cooling temperature, on microstructure and mechanical properties of high strength low alloy steels for developing superior low temperature toughness construction steel. The microstructural features were characterized by scanning electron microscope equipped with electron backscatter diffraction, and the mechanical behaviors in terms of tensile properties and impact toughness were analyzed in correlation with microstructural evolution. The results showed that the lower finish cooling temperature could lead to a considerable increase in impact toughness for this steel. A mixed microstructure was obtained by TMCP at lower finish cooling temperature, which contained much fine lath-like bainite with dot-shaped M/A constituent and less granular bainite and bainite ferrite. In this case, this steel possesses yield and ultimate tensile strengths of ~ 885 MPa and 1089 MPa, respectively, and a total elongation of ~ 15.3%, while it has a lower yield ratio of ~ 0.81. The superior impact toughness of ~ 89 J at-20 °C was obtained, and this was resulted from the multi-phase microstructure including grain refinement, preferred grain boundaries misorientation, fine lath-like bainite with dot-shaped M/A constituent.展开更多
TMCP(Thermal Mechanical Control Process)是20世纪钢铁业最伟大的成就之一。TMCP技术是通过控制轧制温度和轧后冷却速度、冷却的开始温度和终止温度,来控制钢材高温奥氏体组织形态以及相变过程,最终控制钢材的组织类型、形态和分布,...TMCP(Thermal Mechanical Control Process)是20世纪钢铁业最伟大的成就之一。TMCP技术是通过控制轧制温度和轧后冷却速度、冷却的开始温度和终止温度,来控制钢材高温奥氏体组织形态以及相变过程,最终控制钢材的组织类型、形态和分布,提高钢材的组织和力学性能。介绍了低碳低合金高强钢基于TMCP的发展历程、研究进展、组织分析,并展望了TMCP技术下低碳低合金高强钢未来的发展方向。展开更多
基金financially supported by the National Natural Science Foundation of China(Grant No.51904071)the Independent Project of State Key Laboratory of Rolling and Automation,Northeastern University(Grant No.ZZ202001)+1 种基金the Key Research and Development Program of Hebei Province of China(Grant No.18211019D)the Start-up Project of Doctor Scientific Research of Liaoning Province(Grant No.2020-BS-271)。
文摘The present article aims at elucidating the effect of thermo-mechanical controlled processing(TMCP), especially the finish cooling temperature, on microstructure and mechanical properties of high strength low alloy steels for developing superior low temperature toughness construction steel. The microstructural features were characterized by scanning electron microscope equipped with electron backscatter diffraction, and the mechanical behaviors in terms of tensile properties and impact toughness were analyzed in correlation with microstructural evolution. The results showed that the lower finish cooling temperature could lead to a considerable increase in impact toughness for this steel. A mixed microstructure was obtained by TMCP at lower finish cooling temperature, which contained much fine lath-like bainite with dot-shaped M/A constituent and less granular bainite and bainite ferrite. In this case, this steel possesses yield and ultimate tensile strengths of ~ 885 MPa and 1089 MPa, respectively, and a total elongation of ~ 15.3%, while it has a lower yield ratio of ~ 0.81. The superior impact toughness of ~ 89 J at-20 °C was obtained, and this was resulted from the multi-phase microstructure including grain refinement, preferred grain boundaries misorientation, fine lath-like bainite with dot-shaped M/A constituent.
文摘TMCP(Thermal Mechanical Control Process)是20世纪钢铁业最伟大的成就之一。TMCP技术是通过控制轧制温度和轧后冷却速度、冷却的开始温度和终止温度,来控制钢材高温奥氏体组织形态以及相变过程,最终控制钢材的组织类型、形态和分布,提高钢材的组织和力学性能。介绍了低碳低合金高强钢基于TMCP的发展历程、研究进展、组织分析,并展望了TMCP技术下低碳低合金高强钢未来的发展方向。
