The Mechanism of Intragranular Acicular Ferrite Nucleation Induced by Mg-Al-O Inclusions
The features of inclusion and microstructure for carbon structural steel containing Mg-Al-O inclusions were studied through the scanning electron microscope (SEM) and Energy Dispersive Spectrometer (EDS). It can be seen that, in Mg-Al-O inclusions, the elements of Mn, Si, and S coexist, and their ce...
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| Format: | Article |
| Language: | English |
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Wiley
2015-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2015/378678 |
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| author | Kong Hui Zhou YaHui Lin Hao Xia Yunjin Li Jie Yue Qiang Cai ZhengYu |
| author_facet | Kong Hui Zhou YaHui Lin Hao Xia Yunjin Li Jie Yue Qiang Cai ZhengYu |
| author_sort | Kong Hui |
| collection | DOAJ |
| description | The features of inclusion and microstructure for carbon structural steel containing Mg-Al-O inclusions were studied through the scanning electron microscope (SEM) and Energy Dispersive Spectrometer (EDS). It can be seen that, in Mg-Al-O inclusions, the elements of Mn, Si, and S coexist, and their central mole ratio of Mg/Al varies in a wide range. This value for most inclusions is larger than 0.5, which suggests the formation of solid solution between MgAl2O4 and MgO. After etching, the typical microstructure of intragranular acicular ferrites is observed, which is due to the nucleation effect induced by Mg-Al-O inclusions. From the SEM-EDS mapping images, it is found that the element of sulfur accumulates on the periphery of nucleation inclusion. Moreover, line EDS analysis hints that Mn-depletion zone (MDZ) exists in steel matrix, which is adjacent to the complex inclusion. Combined with the theoretical analysis, this phenomenon can be explained by the absorption of Mn due to the magnesium vacancy in MgAl2O4, and this MDZ promotes the nucleation of intragranular acicular ferrite. Through statistical analysis of SEM images for microstructure, the probabilistic nature of inducing nucleation effect is revealed. These results may be helpful to clarify the nature of oxide metallurgy. |
| format | Article |
| id | doaj-art-b2cb6ba7ce634c1fa6c7351453eb9c95 |
| institution | OA Journals |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2015-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-b2cb6ba7ce634c1fa6c7351453eb9c952025-08-20T02:23:27ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422015-01-01201510.1155/2015/378678378678The Mechanism of Intragranular Acicular Ferrite Nucleation Induced by Mg-Al-O InclusionsKong Hui0Zhou YaHui1Lin Hao2Xia Yunjin3Li Jie4Yue Qiang5Cai ZhengYu6School of Metallurgical Engineering, Anhui University of Technology, Maanshan, Anhui 243002, ChinaSchool of Metallurgical Engineering, Anhui University of Technology, Maanshan, Anhui 243002, ChinaSchool of Metallurgical Engineering, Anhui University of Technology, Maanshan, Anhui 243002, ChinaSchool of Metallurgical Engineering, Anhui University of Technology, Maanshan, Anhui 243002, ChinaSchool of Metallurgical Engineering, Anhui University of Technology, Maanshan, Anhui 243002, ChinaSchool of Metallurgical Engineering, Anhui University of Technology, Maanshan, Anhui 243002, ChinaSchool of Metallurgical Engineering, Anhui University of Technology, Maanshan, Anhui 243002, ChinaThe features of inclusion and microstructure for carbon structural steel containing Mg-Al-O inclusions were studied through the scanning electron microscope (SEM) and Energy Dispersive Spectrometer (EDS). It can be seen that, in Mg-Al-O inclusions, the elements of Mn, Si, and S coexist, and their central mole ratio of Mg/Al varies in a wide range. This value for most inclusions is larger than 0.5, which suggests the formation of solid solution between MgAl2O4 and MgO. After etching, the typical microstructure of intragranular acicular ferrites is observed, which is due to the nucleation effect induced by Mg-Al-O inclusions. From the SEM-EDS mapping images, it is found that the element of sulfur accumulates on the periphery of nucleation inclusion. Moreover, line EDS analysis hints that Mn-depletion zone (MDZ) exists in steel matrix, which is adjacent to the complex inclusion. Combined with the theoretical analysis, this phenomenon can be explained by the absorption of Mn due to the magnesium vacancy in MgAl2O4, and this MDZ promotes the nucleation of intragranular acicular ferrite. Through statistical analysis of SEM images for microstructure, the probabilistic nature of inducing nucleation effect is revealed. These results may be helpful to clarify the nature of oxide metallurgy.http://dx.doi.org/10.1155/2015/378678 |
| spellingShingle | Kong Hui Zhou YaHui Lin Hao Xia Yunjin Li Jie Yue Qiang Cai ZhengYu The Mechanism of Intragranular Acicular Ferrite Nucleation Induced by Mg-Al-O Inclusions Advances in Materials Science and Engineering |
| title | The Mechanism of Intragranular Acicular Ferrite Nucleation Induced by Mg-Al-O Inclusions |
| title_full | The Mechanism of Intragranular Acicular Ferrite Nucleation Induced by Mg-Al-O Inclusions |
| title_fullStr | The Mechanism of Intragranular Acicular Ferrite Nucleation Induced by Mg-Al-O Inclusions |
| title_full_unstemmed | The Mechanism of Intragranular Acicular Ferrite Nucleation Induced by Mg-Al-O Inclusions |
| title_short | The Mechanism of Intragranular Acicular Ferrite Nucleation Induced by Mg-Al-O Inclusions |
| title_sort | mechanism of intragranular acicular ferrite nucleation induced by mg al o inclusions |
| url | http://dx.doi.org/10.1155/2015/378678 |
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