COMBUSTION SYNTHESIS OF TiC-TiB2 PARTICU- LATES LOCALLY REINFORCED STEEL MATRIX COMPOSITES FROM AN Al-Ti-B4C SYSTEM DURING CASTING

doi:10.3724/SP.J.1037.2013.00548

Acta Metall Sin

2014, Vol. 50

Issue (3): 367-372 DOI: 10.3724/SP.J.1037.2013.00548

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COMBUSTION SYNTHESIS OF TiC-TiB₂ PARTICU- LATES LOCALLY REINFORCED STEEL MATRIX COMPOSITES FROM AN Al-Ti-B₄C SYSTEM DURING CASTING

WANG Ying, ZOU Binglin(

), CAO Xueqiang

State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022

Cite this article:

WANG Ying, ZOU Binglin, CAO Xueqiang. COMBUSTION SYNTHESIS OF TiC-TiB₂ PARTICU- LATES LOCALLY REINFORCED STEEL MATRIX COMPOSITES FROM AN Al-Ti-B₄C SYSTEM DURING CASTING. Acta Metall Sin, 2014, 50(3): 367-372.

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Abstract

From the point of view of the application, the service life of component usually relies on the wear resistance of local region, and it is desirable that the local region of component rather than the whole component is reinforced by ceramic particulate to offer high-wear resistance. In this study, the TiC-TiB₂ particulates locally reinforced steel matrix composites were fabricated by an SHS-casing route using an Al-Ti-B₄C system. The effects of the Al content on the microstructure and wear resistance of the composites were investigated. The results show that the TiC and TiB₂ particulates were formed in all the preforms with various Al contents (0~50%, mass fraction) after the high temperature (about 1873 K ) steel melt was poured into the mold and the molten steel, to the different extents, penetrates into the synthesized samples. The Al content in the preforms has a large effect on the constitute of the synthesized products and the quantity, size and distribution of the ceramic phases in both the reinforced region and the transition region. With the increase of the Al content, the quantity and average size of the ceramic particles as well as holes decrease, the type and quantity of the intermetallic compounds in the products increase and the gradient distribution of the ceramic particles in the transition region weakens and finally disappears. The wear resistance of the locally reinforced composites is much superior to that of the unreinforced steel matrix, and the best appears in the sample free of Al composition, and then followed by the samples of 30%Al, 10%Al and 50%Al in turn.

Key words: combustion synthesis composite microstructure wear

Received: 04 September 2013

ZTFLH:	TB33
	TQ13

Fund: Supported by National Natural Science Foundation of China (No.51101143)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00548 OR https://www.ams.org.cn/EN/Y2014/V50/I3/367

Fig.1

不同Al含量时局部增强区产物相的XRD谱

Fig.2

不同Al含量局部增强区的SEM像

Fig.3

不同Al含量时钢基体和增强区的界面

Fig.4

钢基体和不同Al含量时局部增强复合材料在不同载荷时的体积磨损率

Fig.5

钢基体和Al含量为10%时的局部增强区干磨损后的磨痕形貌

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