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EFFECT OF TiN PRECIPITATES ON SOLIDIFICATION MICROSTRUCTURE OF MEDIUM CARBON Cr-Mo WEAR RESISTANT STEEL
Guo Wenying1,2; Hu Xiaoqiang2; Ma Xiaoping2; Li Dainzhong2
Corresponding AuthorHu Xiaoqiang(xqhu@imr.ac.cn)
2016-07-01
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume52Issue:7Pages:769-777
AbstractAs an important type of wear-resistant material, the low-alloyed medium carbon wear resistant steel has been widely used in mining, power and metallurgical industries due to its low cost and excellent mechanical properties. However, the coarse as-cast microstructure tends to form in large wear resistant castings because of the long solidification time. As a result, spalling wear resulting from the preferential initiation and propagation of cracks along interdendrite will occur during service process, which severely degrades the wear resistance and service life. In this work, Ti is added to improve the mechanical properties of medium carbon Cr-Mo wear resistant steel. The precipitation behavior of TiN in the solidification process and its effect on the solidification microstructure were investigated by thermodynamic calculation, constant temperature solidification experiment at solid-liquid two phase region and continuous cooling solidification experiment by using OM, SEM, EDS and EPMA. The results show that TiN precipitation temperature gradually increases at solid-liquid two-phase region with the increase of contents of Ti and N. TiN precipitates directly in the liquid region when Ti and N contents (mass fraction) are 0.090% and 0.014%, respectively. Holding at different temperatures of solid-liquid two-phase region, a very small amount of TiN precipitates are present within the dendritic arm, and a large number of TiN precipitates are present at the interdendritic positions and frontiers of dendrites. After quenching, in the remaining liquid most of TiN are present at the boundaries of equiaxed grain and a little amount of TiN stay within the equiaxed grain. During the continuous cooling solidification, TiN precipitation temperature is the main factor affecting the refinement of solidification microstructure. With the increase of Ti content, TiN precipitation temperature increases. At the same time, the actual solidification temperature of liquid steel rises, the solidification temperature range broadens and the local solidification time extends, which results in the increase of secondary dendrite arm spacing. When Ti content exceeds 0.066%, TiN precipitation temperature is near or above the liquidus line. The actual solidification temperature of liquid steel remains unchanged. Therefore, the secondary dendrite arm spacing becomes stable.
Keywordwear-resistant steel TiN precipitate solidification microstructure secondary dendrite arm spacing
DOI10.11900/0412.1961.2015.00532
Indexed BySCI
Language英语
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000385747800001
PublisherSCIENCE PRESS
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/123026
Collection中国科学院金属研究所
Corresponding AuthorHu Xiaoqiang
Affiliation1.Univ Sci & Technol China, Sch Chem & Mat Sci, Hefei 230022, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Guo Wenying,Hu Xiaoqiang,Ma Xiaoping,et al. EFFECT OF TiN PRECIPITATES ON SOLIDIFICATION MICROSTRUCTURE OF MEDIUM CARBON Cr-Mo WEAR RESISTANT STEEL[J]. ACTA METALLURGICA SINICA,2016,52(7):769-777.
APA Guo Wenying,Hu Xiaoqiang,Ma Xiaoping,&Li Dainzhong.(2016).EFFECT OF TiN PRECIPITATES ON SOLIDIFICATION MICROSTRUCTURE OF MEDIUM CARBON Cr-Mo WEAR RESISTANT STEEL.ACTA METALLURGICA SINICA,52(7),769-777.
MLA Guo Wenying,et al."EFFECT OF TiN PRECIPITATES ON SOLIDIFICATION MICROSTRUCTURE OF MEDIUM CARBON Cr-Mo WEAR RESISTANT STEEL".ACTA METALLURGICA SINICA 52.7(2016):769-777.
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