Microstructure and Mechanical Properties of Spray Deposited W9Mo3Cr4V High Speed Steel

Rui Zhou; Jian Fei Sun; Ying Jun Yang

doi:10.4028/www.scientific.net/AMR.391-392.714

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 391-392Microstructure and Mechanical Properties of Spray...

Microstructure and Mechanical Properties of Spray Deposited W9Mo3Cr4V High Speed Steel

Abstract:

Microstructure and mechanical properties of W9Mo3Cr4V high speed steel fabricated by spray deposition have been studied. Spray deposited W9Mo3Cr4V high speed steel has a typical equiaxed structure which is finer and more homogeneous with a grain size of 20-30 micrometer compared with conventional casted counterparts. There are pores in the matrix of the deposited steel, which involve gas porosity, filling porosity and solidification shrinkage. As-deposited high speed steel is mainly composed of martensite, austenite and carbides which comprise MC carbide and M₆C carbide. Mechanical properties show that the hardness and bending strength of the as-deposited steel are higher than that of the conventionally casted ones. However, impact toughness of the high speed steel is lower than that of the conventionally casted steel, which can be attributed to the existence of porosities and M₆C carbides which reduce the impact toughness of high speed steels.