Q345B钢轧后拉伸分层试样的显微组织研究  

Microstructure in Laminated Tensile Specimens of Q345B Steel after Rolling

作　　者：郑建平[1,2] 黄贞益[1,2] 姜辉[1,2] 王萍[1,2] 尹桂全[1,2] 

机构地区：[1]安徽工业大学材料科学与工程学院,安徽马鞍山243002 [2]安徽省高校金属材料与加工重点实验室,安徽马鞍山243002

出　　处：《热处理》2009年第1期42-46,共5页Heat Treatment

摘　　要：利用金相检验,扫描电镜,能谱分析以及元素分布原位分析等手段,研究了Q345B钢轧后拉伸试样中的夹杂物和显微组织,寻求产生拉伸分层的原因。结果表明,Q345B钢连铸坯中主要微合金元素C、Mn、Nb等的偏析,造成轧后试样中存在大量的长条状MnS夹杂物,块状铌、钛的碳化物和条带状马氏体组织,致使局部力学性能差异过大,容易在缺陷集中分布的显微组织层面上产生开裂和分层。The inclusion and microstructure in rolled tensile specimen of Q345B steel were studied with optical metallograph, SEM, energy dispersive spectrum analysis, original position analysis on the element distribution and so on to explore the cause for laminating in tensile specimen. The results show that the segregation of main microalloying elements such as C, Mn and Nb in the continuous cast billet of Q345 B steel will result in a great number of MnS streaky inclusion, massive carbides of Nb and Ti and ribbon martensite existing in the rolled specimen, and as a result, great difference of mechanical properties will appear among different positions of a specimen, consequently the crack and lamination will be induced along crystal plane where the defects concentrate.

关 键 词：Q345B钢 夹杂物 显微组织 分层现象 原位分析 

分 类 号：TG142.1[一般工业技术—材料科学与工程]