High hardness and high wear resistance steel bonded carbide

Abstract

The invention discloses a steel bonded hard alloy with high hardness and high wear resistance, consisting of 48.0-62.0% of hard phase and 52.0-38.0% of binding phase, wherein the binding phase mainly comprises 12.0-19.0% of Mn, 0.8-1.8% of Ni, 0.8-1.4% of Mo, 0.7-1.2% of C, the balance of Fe and not larger than 0.5% of other unavoidable impurities. The hard phase is composed of TiC and B4C. B4C with powder particle size not larger than 0.5 microns and mass fraction of 2.0-8.0% is added to fill the gaps of the coarse granules TiC, in order to prevent the TiC crystalline grain from growing and improving the hardness of the hard alloy. In addition, the alloy components of the binding phase are changed to control the loss of binding metals, and a high-performance hard alloy generating primary austenite at a sintered state can be obtained without water toughening treatment, the strength of the alloy is not smaller than 1800 MPa, the density is 5.8 g / cm<3>, and the hardness is increased from HRC60-62 to HRC68-70, so that the steel bonded hard alloy is a low-density and high-performance alloy.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to the preparation of high hardness and high wear resistance steel-bonded hard alloy. Background technique [0002] In steel-bonded hard alloys, according to the composition of the binder phase matrix, there are alloy tool steel steel-bonded hard alloys, stainless steel-bonded hard alloys, high-speed steel and high-manganese steel-bonded hard alloys. If divided according to the hard phase, there are two types of steel-bonded hard alloys: TiC and WC. Similarly, there are two types of high manganese steel-bonded cemented carbides: TiC and WC. TiC-based steel-bonded hard alloys have been studied more at home and abroad, and TiC-based steel-bonded hard alloys occupy a larger market share and have a wider range of applications. The reason is that TiC is rich in resources, low in price, and its density is one-third of that of WC. In the case of the same hardness, the wear-resi...

AI Technical Summary

Problems solved by technology

First, the composition of the hard phase is single, which is easy to cause TiC particles to aggregate and grow, resulting in adjacency, making the alloy brittle and uneven in hardness; second, the composition defect of the binder phase is that the content of precious metals is high, and the design of the amount of Mn is not good. Reasonable and volatile, the bonding metal is easy to lose, and the composition segregates, resulting in loose organization and increased porosity

Its sintered structure is TiC+pearlite+carbide, and the austenite structure can only be obtained after water toughening treatment, and it is not even a uniform austenite structure, which seriously affects the quality and application range of the alloy, and wastes a lot of energy.