The role of Mn depletion in intra-granular ferrite transformation in the heat affected zone of welded joints with large heat input in structural steels
The role of Mn depletion in intra-granular ferrite transformation in the heat affected zone of welded joints with large heat input in structural steels
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DOI：
10.2355/isijinternational.36.1406
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发表时间：
1996-11
影响因子：
1.8
通讯作者：
H. Mabuchi;R. Uemori;M. Fujioka
中科院分区：
文献类型：
--
作者：
H. Mabuchi;R. Uemori;M. Fujioka
焊接接头热影响区晶内铁素体（IGF）相变在结构钢中已得到实际应用，但其形核机制尚未阐明。然后，Mn耗尽的作用进行了研究，以阐明IGF形核的机制。首次通过配备能量色散X射线谱仪的场发射透射电子显微镜（FE-TEM-EDS）的纳米探针分析证明了MnS/铁氧体基体界面处Mn耗尽的直接证据。Mn耗尽的存在也被认为促进在（Mn，Si）氧化物上新沉淀的MnS的界面处的IGF成核，这被认为与铁素体基体没有相干性。
Intra-Granular Ferrite (IGF) transformation in the Heat Affected Zone (HAZ) of welded joints has been practically applied in structural steels, but the mechanism of IGF nucleation has not been elucidated yet. Then, the role of Mn depletion was investigated to elucidate the mechanism of IGF nucleation. It was first demonstrated to prove the direct evidence of Mn depletion at the interface of MnS/ferrite matrix by the nano-probe analysis of Field-Emission Transmission Electron Microscope equipped with Energy Dispersive X-ray Spectroscopy (FE-TEM-EDS). The presence of Mn depletion is also believed to promote IGF nucleation at the interface of MnS newly precipitated on (Mn, Si) oxide, which is considered to have no coherency with ferrite matrix.