Influence of adding Ti powder in preform on microstructure and mechanical properties of Al₂O₃p/steel composites by squeeze casting

Abstract

To improve the mechanical properties of alumina particulates reinforced steel matrix composite, Ti powder was added into the alumina preform, a 5140 steel matrix composite was fabricated by squeeze casting, and the influences of Ti powder on the microstructure, hardness and bending strength of the composite were investigated, compared with the composite without adding Ti powder. Applied Ti powder and alumina particulates were 10-25 μm and 100-180 μm in size, respectively. Both composites were successfully fabricated, however Ti powder addition increased the infiltration thickness of the composite. In the Ti contained composite, a TiC film in micron scale is formed on the surface of alumina particles, many TiC aggregates are dispersed in the steel matrix without obvious remaining Ti powder. The hardness and the three-point bending strength of the composite reach 49.5 HRC and 1 018 MPa, respectively, which are 17.9% and 52.4% higher than those of the composite in the absence of Ti addition. Fracture morphology shows that the debonding of alumina particulates is eliminated for the composite in the presence of Ti addition. Sessile drop test shows the average wetting angle between 5140 steel and that of Ti coated Al₂O₃ is about 82.15°, much lower than the wetting angle 150° between steel and pure Al₂O₃. Therefore, the increase in the mechanical properties of the composite is attributed to the improvement of Al₂O₃p/steel interface wetting and bonding by adding Ti powder in the preform.

Keywords

squeeze casting / Al₂O₃ / steel matrix composites / interface / mechanical properties

References

[1] Pagounis E, Lindroos VK. Processing and Properties of Particulate Reinforced Steel Matrix Composites[J]. Mater. Sci. Eng. A, 1998, 246(1-2): 221-234.

[2] Bao CG, Xing JD, Gao YM. Wear Resistant of Al₂O₃/Heat Resistant Steel at High Temperature[J]. Key Eng. Mater., 2005, 280-283(1-2): 1119-1122.

[3] Gupta P, Kumar D, Parkash O, et al. Structural and Mechanical Behaviour of 5% Al₂O₃-Reinforced Fe Metal Matrix Composites (MMCs) Produced by Powder Metallurgy (P/M) Route[J]. Bull. Mater. Sci., 2013, 36(5): 859-868.

[4] Wang XH, Zhang M, Du BS. Fabrication in Situ TiB₂–TiC–Al₂O₃ Multiple Ceramic Particulates Reinforced Fe-Based Composite Coatings by Gas Tungsten Arc Welding[J]. Tribol. Lett., 2011, 41: 171-176.

[5] Saha P, Tarafdar D, Pal SK, et al. Modeling of Wire Electro-Discharge Machining of TiC/Fe in Situ Metal Matrix Composite Using Normalized RBFN with Enhanced K-Means Clustering Technique[J]. The International Journal of Advanced Manufacturing Technology, 2009, 43(1-2): 107-116.

[6] Draper SL, Aikin BJM. Effect of Composite Fabrication on the Strength of Single Crystal Al₂O₃ Fibers in Two Fe-Base Alloy Composites[J]. Mater. Sci. Eng. A, 1999, 266: 18-29.

[7] Shamsuddin S, Jamaludin SB, Hussain Z, et al. The Effects of Al₂O₃ Amount on the Microstructure and Properties of Fe-Cr Matrix Composites[J]. Metall. Mater. Trans. A, 2010, 41(13): 3452-3457.

[8] Lemster K, Graule T, Minghetti T, et al. Mechanical and Machining Properties of X38CrMoV5-1/Al₂O₃ Metal Matrix Composites and Components[J]. Mater. Sci. Eng. A, 2006, 420(1-2): 296-305.

[9] Li RJ. Ceramic-Metal Composites[M]. 1995 Beijing: Metallurgy Industry Press.

[10] Vasic S G, Kuebler BJ, et al. Experimental Models for Activtation Mechanism of Pressureless Infiltration in the Non-Wetting Steel-Alumina MMC System[J]. Adv. Eng. Mater., 2008, 10(5): 471-475.

[11] Wang E, Zheng Y, Xing J. Fabricating Steel-Based Composites Containing Ceramic Particulates with Vacuum Infiltration Process[J]. Acta Materiae Compositae Sinica, 1998, 15(2): 12-17.

[12] Travitzky N, Kumar P, Sandhage KH, et al. Rapid Synthesis of Al₂O₃ Reinforced Fe–Cr–Ni Composites[J]. Mater. Sci. Eng. A, 2003, 344(1-2): 245-252.

[13] Lemster K, Graule T, Kuebler J. Processing and Microstructure of Metal Matrix Composites Prepared by Pressureless Ti-Activated Infiltration Using Fe-Base and Ni-Base Alloys[J]. Mater. Sci. Eng. A, 2005, 393(1-2): 229-238.

[14] Bahraini M, Schlenther E, Kriegesmann J, et al. Influence of Atmosphere and Carbon Contamination on Activated Pressureless Infiltration of Alumina-Steel Composites[J]. Composites A, 2010, 41(10): 1511-1515.

[15] Bai Y, Li X, Xing L, et al. Effect of Salt Spray Corrosion on Tribological Properties of HVOF Sprayed Nicr-Cr₃C₂ Coating with Intermediate Layer[J]. J. Wuhan Univ. Technol.-Mater. Sci. Ed., 2017, 32(2): 292-298.

[16] Wang H, Mao X. Effect of Attapulgite Added in Plating Bath on the Properties of Ni/TiC Nano-Composite Coatings[J]. J. Wuhan Univ. Technol.-Mater. Sci. Ed., 2017, 32(2): 250-255.

[17] Gupta P, Kumar D O P, et al. Hardness and Wear Behavior of Co Doped Fe-Al₂O₃ Metal Matrix Composite (MMC) Synthesized via Powder Metallurgy (P/M) Technique[J]. Adv. Mater. Res., 2012 584-589.

[18] He XG, Lu DH, Chen SM, et al. Preparation of Al₂O₃ Particulates Reinforced Steel Matrix Composites by Squeezing Casting[J]. Special Casting & Nonferrous Alloys, 2012, 32(12): 1148-1151.

[19] Bahraini M, Minghertti T, Zoellig M, et al. Activated Pressureless Infiltration of Metal-Matrix Composites with Graded Activator Content[J]. Composites A, 2009, 40: 1566-1572.

[20] Li RJ. Ceramics-Metal Composites[M]. 1995 Beijing: Metallurgical Industry Press.