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Effect of Temperature on Microstructure and Formability of Al-10 mass% Si Coatings
Alternative TitleEffect of Temperature on Microstructure and Formability of Al-10 mass%Si Coatings
Zhang Jie1; Jiang Sheming1; Zhang Qifu1; Liu Changsheng2
2016
Source PublicationJOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
ISSN1006-706X
Volume23Issue:3Pages:270-275
AbstractThe type-1 aluminized (Al-10 mass% Si) coating on hot stamped steel is used in commercial applications. The effect of temperature on microstructure and formability of the Al-10 mass% Si coating was investigated. Hot-dip aluminized 22MnB5 steel was heated at 870, 900, 930, and 1 050 degrees C for 5 min. After heat treatment at different temperatures, the microstructure of Al-10 mass% Si was characterized by field-emission scanning electron microscopy and energy-dispersive spectroscopy. The results show that when the Al-10 mass% Si coating was heated at 870 degrees C for 5 min, three types of intermetallic phases were formed: two ternary Fe-Si-Al phases (Fe2SiAl7+Fe2Si2Al5 and Fe2SiAl2+Fe2Si2Al5) and one binary Fe-Al phase (FeAl3). The phases in the coating became Fe2SiAl2+Fe2Si2Al5 and FeAl3, the binary Fe-Al phase near the interface became Fe2Al5 and the Si-rich layers were decreased with the increase of heating temperature. When the heat treatment was 1050 degrees C for 5 min, the Si-rich layer disappeared, the coating consisted of FeAl and Fe3Al, and the Kirkendall voids were formed. When the heating temperature was increased through 870, 900, and 930 degrees C, the coating hardness was reduced and cracks were formed in the coating after hot stamping. The formability of the coating with temperature change was confirmed by a hot stamping test. When heated at 1 050 degrees C, the coating was formable but continuous Kirkendall voids were observed.
Other AbstractThe type-1 aluminized(Al-10 mass%Si)coating on hot stamped steel is used in commercial applications. The effect of temperature on microstructure and formability of the Al-10 mass%Si coating was investigated.Hot-dip aluminized 22MnB5 steel was heated at 870,900,930,and 1 050℃ for 5 min.After heat treatment at different temperatures,the microstructure of Al-10 mass%Si was characterized by field-emission scanning electron microscopy and energy-dispersive spectroscopy.The results show that when the Al-10 mass%Si coating was heated at 870℃ for 5 min,three types of intermetallic phases were formed:two ternary Fe-Si-Al phases(Fe_2SiAl_7+Fe_2Si_2Al_5 and Fe_2SiAl_2+Fe_2Si_2Al_5)and one binary Fe-Al phase(FeAl_3).The phases in the coating became Fe_2SiAl_2+Fe_2Si_2Al_5 and FeAl_3,the binary Fe-Al phase near the interface became Fe_2Al_5 and the Si-rich layers were decreased with the increase of heating temperature.When the heat treatment was 1 050℃ for 5 min,the Si-rich layer disappeared,the coating consisted of FeAl and Fe_3Al,and the Kirkendall voids were formed.When the heating temperature was increased through 870,900,and 930℃, the coating hardness was reduced and cracks were formed in the coating after hot stamping.The formability of the coating with temperature change was confirmed by a hot stamping test.When heated at 1 050℃, the coating was formable but continuous Kirkendall voids were observed.
KeywordHOT SILICON STEEL Al-Si coating heating temperature microstructure formability hot-stamping
Indexed ByCSCD
Language英语
CSCD IDCSCD:5660280
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/143915
Collection中国科学院金属研究所
Affiliation1.Cent Iron & Steel Res Institute, Natl Engn Lab Adv Coating Technol Met, Beijing 100081, Peoples R China
2.中国科学院金属研究所
Recommended Citation
GB/T 7714
Zhang Jie,Jiang Sheming,Zhang Qifu,et al. Effect of Temperature on Microstructure and Formability of Al-10 mass% Si Coatings[J]. JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL,2016,23(3):270-275.
APA Zhang Jie,Jiang Sheming,Zhang Qifu,&Liu Changsheng.(2016).Effect of Temperature on Microstructure and Formability of Al-10 mass% Si Coatings.JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL,23(3),270-275.
MLA Zhang Jie,et al."Effect of Temperature on Microstructure and Formability of Al-10 mass% Si Coatings".JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL 23.3(2016):270-275.
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