FB2马氏体耐热钢在焊接热作用下奥氏体相变过程研究
发布时间:2018-07-26 07:41
【摘要】:借助光学显微镜、扫描电镜分析对比了FB2马氏体耐热钢在焊接热模拟前后的组织状态,认为FB2钢在快速加热条件(≥100℃/s)下的奥氏体相变是切变型的,表现出奥氏体记忆效应;而在慢速加热条件(≤5℃/s)下其奥氏体相变是扩散型的,该过程是受原子短程扩散控制的,并且无奥氏体记忆效应发生。FB2钢在焊接过程中特殊的相变过程是其焊接热影响区呈现出"无粗晶区"的主要原因。结合已有的文献报道,初步提出了B元素改变FB2钢在加热过程中奥氏体相变类型的机理模型,进一步发展了现有的研究结果。
[Abstract]:By means of optical microscope and scanning electron microscope, the microstructure of FB2 martensite heat-resistant steel before and after welding thermal simulation was analyzed and compared. The austenitic transformation of FB2 steel under rapid heating condition (鈮,
本文编号:2145325
[Abstract]:By means of optical microscope and scanning electron microscope, the microstructure of FB2 martensite heat-resistant steel before and after welding thermal simulation was analyzed and compared. The austenitic transformation of FB2 steel under rapid heating condition (鈮,
本文编号:2145325
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