摘要
通过金相显微镜、透射电镜、X射线仪以及力学性能测试等对自行设计的20MnSi钢的强韧化机制进行研究。结果表明试验钢性能取决于钢组织中原奥氏体晶粒的细化、弥散质点V(CN)的析出、珠光体片间距的减小和渗碳体片的变薄、以及珠光体数量的减少;此外,控轧控冷为20MnSi钢组织转变创造了热力学和动力学上的特殊条件,在铁素体基体上析出了细小且相互交错分布的针状铁素体,与平衡相铁素体相比较,它的形貌和结构特点对铁素体晶粒的塑性变形和微裂纹的扩展都会造成阻碍,因此,能够较好的改善钢的强韧性。
Strengthening and toughening mechanism of a vanadium microalloyed 20MnSi steel were investigated by means of optical microscope（OM）,transmission electron microscope（TEM）,X-ray diffractionary（XRD） and mechanical performance tests.The results show that the properties of 20MnSi steel are related to the original austenite grain,dispersion particle V,pearlite spacing,cementite lamella and the pearlite quantities.In addition,the special thermodynamics and kinetics condition for the 20MnSi steel are created in the process of phase transformation by controlled rolling and cooling technology,that is,acicular ferrite with small dimension and interlaced distribution are precipitated in ferrite matrix.Compared with the balanced ferrite phase,the ferrite grain plasticity deformation and crack growth are inhibited for its morphology and the structure characterization.Therefore,20MnSi steel microalloyed with vanadium exhibits the better strength and toughness as result of the controlled rolling and cooling technology.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2013年第7期78-83,共6页
Transactions of Materials and Heat Treatment
基金
吉林省科技发展计划项目(20100330)
关键词
V微合金化
控轧控冷工艺
细晶强化
针状铁素体
microalloying with V
controlled rolling and cooling technology
fine grain strengthening
acicular ferrite
