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Microstructure in Laminated Tensile Specimens of Q345B Steel after Rolling
Author(s): 
Pages: 42-46
Year: Issue:  1
Journal: Heat Treatment

Keyword:  Q345B钢夹杂物显微组织分层现象原位分析;
Abstract: 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.
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