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添加铬和钼对球墨铸铁表面激光合金化原位生成TiC增强复合表层组织的影响

Effect of Chromium and Molybdenum Addition on the Microstructure of In Situ TiC-Reinforced Composite Surface Layers Fabricated on Ductile Cast Iron by Laser Alloying.

作者信息

Janicki Damian

机构信息

Department of Welding, Silesian University of Technology, Konarskiego 18A, 44-100 Gliwice, Poland.

出版信息

Materials (Basel). 2020 Dec 16;13(24):5750. doi: 10.3390/ma13245750.

DOI:10.3390/ma13245750
PMID:33339332
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7766769/
Abstract

In situ TiC-reinforced composite surface layers (TRLs) were produced on a ductile cast iron substrate by laser surface alloying (LA) using pure Ti powder and mixtures of Ti-Cr and Ti-Mo powders. During LA with pure Ti, the intensity of fluid flow in the molten pool, which determines the TRL's compositional uniformity, and thus Ti content in the alloyed zone, was directly affected by the fraction of synthesized TiC particles in the melt-with increasing the TiC fraction, the convection was gradually reduced. The introduction of additional Cr or Mo powders into the molten pool, due to their beneficial effect on the intensity of the molten pool convection, elevated the Ti concentration in the melt, and, thus, the TiC fraction in the TRL. It was found that the melt enrichment of Cr, in conjunction with non-equilibrium cooling conditions, suppressed the martensitic transformation of the matrix, which lowered the total hardness of the TRL. Moreover, the presence of Cr in the melt (~3 wt%) altered the growth morphology of the synthesized primary TiC precipitates compared with that obtained using pure Ti. The addition of Mo in the melt produced (Ti, Mo)C primary precipitates that exhibited a nonuniform Mo distribution (coring structure). The dissolution of Mo in the primary TiC precipitates did not affect its growth morphology.

摘要

通过使用纯钛粉末以及钛 - 铬和钛 - 钼粉末混合物的激光表面合金化(LA)工艺,在球墨铸铁基体上制备了原位TiC增强复合表面层(TRLs)。在使用纯钛进行激光表面合金化过程中,熔池中流体流动强度直接影响TRL的成分均匀性,进而影响合金化区域中的钛含量,而熔池中合成TiC颗粒的比例决定了流体流动强度——随着TiC比例增加,对流逐渐减弱。由于额外的铬或钼粉末对熔池对流强度有有益影响,将它们引入熔池会提高熔体中的钛浓度,从而提高TRL中的TiC比例。研究发现,铬在熔体中的富集,结合非平衡冷却条件,抑制了基体的马氏体转变,降低了TRL的总硬度。此外,与使用纯钛相比,熔体中铬(约3 wt%)的存在改变了合成初生TiC析出物的生长形态。在熔体中添加钼会生成(Ti, Mo)C初生析出物,其钼分布不均匀(芯部结构)。钼在初生TiC析出物中的溶解并未影响其生长形态。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4050/7766769/d959a640c41e/materials-13-05750-g014.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4050/7766769/497b71e55417/materials-13-05750-g007.jpg
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本文引用的文献

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Influence of Solidification Conditions on the Microstructure of Laser-Surface-Melted Ductile Cast Iron.凝固条件对激光表面熔凝球墨铸铁微观组织的影响
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Materials (Basel). 2018 Jan 5;11(1):75. doi: 10.3390/ma11010075.
4
TiC Reinforcement Composite Coating Produced Using Graphite of the Cast Iron by Laser Cladding.采用激光熔覆技术在铸铁石墨上制备的TiC增强复合涂层。
Materials (Basel). 2016 Sep 30;9(10):815. doi: 10.3390/ma9100815.