调质处理对微合金高强钢组织性能的影响  

Effects of Quenching and Tempering Treatment on theMicrostructure and Mechanical Properties ofMicroalloyed High Strength Steel

作　　者：霍晓飞 高德平 Huo Xiaofei;Gao Deping(Changshu Longteng New Energy Equipment Science and Technology Co.,Ltd.)

机构地区：[1]常熟龙腾新能装备科技有限公司

出　　处：《宽厚板》2024年第4期1-5,共5页Wide and Heavy Plate

摘　　要：采用光学显微镜、场发射扫描电镜以及电子背散射衍射扫描电镜对不同调质工艺处理后的微合金高强钢微观组织进行表征,并探究工艺参数差异对其组织性能的影响。结果表明:905℃淬火+635℃回火处理后的试验钢显微组织主要为回火马氏体,由于细小的亚结构、弥散分布的小尺寸析出物以及高占比的小角度晶界使其具有更高的强度;840℃二次淬火+635℃回火处理后的试验钢强度有所降低,但软相铁素体含量的增加以及小角度晶界占比的降低有效改善了试验钢塑性以及屈强比;当回火温度增加至655℃时,晶粒发生粗化,晶格畸变程度降低,强度下降,同时元素偏聚、晶界应力集中加剧以及析出物聚集长大,导致试验钢塑性显著降低。The microstructure of the microalloyed high strength steel after different quenching and tempering process treatments is characterized by means of optical microscope,field emission scanning microscope and electron backscatter diffraction microscope.the effects of the process parameter differences on the microstructure and mechanical properties are studied.The results show that the microstructure of the test steel obtained after 905℃quenching+635℃tempering mainly consists of tempered martensite with higher strength achieved due to the fine sub-structure,small size precipitates in diffusion distribution and high proportion small angle grain boundary.The strength of the test steel achieved after 840℃secondary quenching+635℃tempering is decreased with improved plasticity and yield to tensile strength ratio due to increased soft phase ferrite content and reduced proportion of small angle grain boundary.When the tempering temperature increases to 655℃,the grains are coarsened the lattice distortion degree is reduced,the strength is decreased,while the plasticity is significantly reduced due to the element gathering,stress concentration at grain boundary,gathered and grown precipitates.

关 键 词：调质处理 显微组织 力学性能 小角度晶界 

分 类 号：TG142.33[一般工业技术—材料科学与工程]