Relationship between MnS precipitation and respective effects of Ti-Mg bearing inclusions on the induction of intergranular acicular ferrite
Relationship between MnS precipitation and respective effects of Ti-Mg bearing inclusions on the induction of intergranular acicular ferrite
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MnS析出与Ti-Mg夹杂物对晶间针状铁素体诱导作用的关系
DOI：
10.3139/120.111301
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发表时间：
2019-02
影响因子：
2.5
通讯作者：
Shan Mengwei
中科院分区：
文献类型：
--
作者：
Xu Chen;Kong Hui;Zhang Mingya;Shan Mengwei
摘要通过扫描电镜（SEM）和能谱仪（EDS）研究了MnS在Ti-Mg处理钢试样中晶内针状铁素体（IAF）形核中的作用。与未处理样品相比，Ti-Mg处理从Al-Mn-Si-O夹杂演变为含Ti-Mg夹杂，导致纯MnS减少。除了纯MnS的减少外，还可以观察到含Ti-Mg夹杂物周围的MnS析出。此外，蚀刻后发现含Ti-Mg夹杂物可以诱导IAF成核。通过EDS线分析和与未处理样品中的Al-Mn-Si-O夹杂物的比较，可以解释这种效应是由夹杂物的空位性质和晶体结构引起的mn损耗区（MDZ）的存在。然而，应该补充的是，在相同的样品中，在纯MnS周围没有观察到类似的诱导成核效应以及MDZ。这一比较表明，中低空区的形成可能与中低空降水无关。
Abstract The role of MnS in the nucleation of intragranular acicular ferrites (IAF) has been explored in Ti-Mg treated steel sample through scanning electron microscope (SEM) and energy dspersive spectrometer (EDS). When compared with a non-treated sample, Ti-Mg treatment evolves from Al-Mn-Si-O inclusion to Ti-Mg bearing inclusion and causes a reduction in pure MnS. In addition to this reduction in pure MnS, a precipitation of MnS around the Ti-Mg bearing inclusion can be observed. Moreover, after etching, it can be found that Ti-Mg bearing inclusions can induce IAF nucleation. Based on EDS line analysis and a comparison with Al-Mn-Si-O inclusion in non-treated sample, this effect can be explained by the presence of an Mn-depletion zone (MDZ) caused by the vacancy property and crystal structure of the inclusion. It should be added, however, that in the same sample, a similarly induced nucleation effect as well as an MDZ have not been observed around pure MnS. This comparison implies that the formation of an MDZ may be independent of MnS precipitation.
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