STUDY OF BRAZING ALLOY USED IN BRAZING COMPOSITE ALLOY CLADDING REINFORCED WITH HARD PARTICLES

Acta Metall Sin

2007, Vol. 43

Issue (4): 433-438 DOI:

Research Articles

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STUDY OF BRAZING ALLOY USED IN BRAZING COMPOSITE ALLOY CLADDING REINFORCED WITH HARD PARTICLES

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大连理工大学工业装备结构分析国家重点实验室

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. STUDY OF BRAZING ALLOY USED IN BRAZING COMPOSITE ALLOY CLADDING REINFORCED WITH HARD PARTICLES. Acta Metall Sin, 2007, 43(4): 433-438 .

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Abstract ABSTRACT A new type of brazing alloy used in brazing composite alloy cladding reinforced with hard particles on steel substrate was developed in this paper. Using the brazing alloy, stable composite alloy cladding on surface of common steel castings was made by optimum brazed hardfacing process. The composite alloy cladding is superior to other claddings obviously in design and regulation of cladding composition, microstructure and performance as well as thickness (maximum up to 30mm) according to practical demands. Besides, it is possessed of good combination property. SEM observation, energy spectrum and XRD analysis have shown that the composite alloy cladding is in strong combination with steel parent metal, and metallurgical bonding is formed between copper brazing alloy matrix and WC grains in the cladding wherein volume fraction of granular WC phase can be up to 54%. The composite alloy was composed of copper alloy solid solution as base-alloy, Cr-phase and MnNi type of compound dispersion phases as well as WC hard phase. WC particles with different grain sizes and volume fractions were close and well distributed in dispersion strengthened copper alloy. Impingement erosion wear tests have proved that the composite alloy is far superior to 30MnSiTi low-alloy steel in wear resistance.

Key words: composite alloy cladding brazing alloy brazed hardfacing tungsten carbide (hard) alloy wear resistan

Received: 26 September 2006

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