钼微合金化低碳钢的显微组织与力学性能

Microstructure and mechanical properties of Mo micro-alloyed low-carbon steel

借助物理模拟系统采用四种不同的多道次变形及控制冷却工艺,研究了成分为0.12C-0.78Si-1.42Mn-0.74Al-0.32Mo钢的显微组织和力学性能.结果显示：使用物理模拟系统进行高温区的多道次热连轧,并结合控制冷却处理,能够得到不同的复相组织（铁素体/贝氏体组织,贝氏体/马氏体组织）.依贝氏体含量和形态的不同,铁素体/贝氏体复相组织钢的屈服强度为388~558 MPa,抗拉强度为681~838 MPa,总延伸率为15%-27%；贝氏体/马氏体复相组织钢的屈服强度为746 MPa,抗拉强度为960 MPa,总延伸率为19%.

ABSTRACT The microstructure and mechanical properties of 0.12C-0.78Si-1.42Mn-0.74Al-0.32Mo steel under four different multi-pass deformation and controlled cooling after rolling were studied by using of a physical simulation system. The results show that different multi-phase structures （ ferrite/bainite and bainite/martensite） can be achieved in the steel under multi-pass deformation at high temperature through the physical simulation system and controlling cooling treatment. The yield strength, tensile strength and total elongation of the steel with the ferrite/bainite structure are 388~558 MPa, 681-838 MPa, and 15% -27%, respectively; but the yield strength, tensile strength, and total elongation of the steel with the bainite/martensite structure reach 746 MPa, 960 MPa, and 19%, respectively.