Material characteristics of steel-bonded cemented carbide

Update:11 May 2019
Summary:

The process performance is good, and it can be machined […]

The process performance is good, and it can be machined and heat treatable. In the annealed state, it can be machined by ordinary cutting equipment and tools for turning, milling, planing, grinding and drilling. Can also be forged and welded. Compared with cemented carbide, it has low cost and wide application range. Good physical and mechanical properties. Steel-bonded cemented carbides have a high hardness in the hardened state. Due to the high hardness of the hard phase containing a large amount of dispersion, the wear resistance can be close to that of the high cobalt cemented carbide.

Compared with high alloy die steel, it has high modulus of elasticity, wear resistance, compressive strength and flexural strength. It has better toughness than cemented carbide. It has good self-lubricity, low friction coefficient and excellent chemical stability. The hard phase WC or titanium carbide of the steel-bonded cemented carbide generally accounts for 30%-50% of the total mass of the alloy, and the rest is a steel matrix. Due to the large proportion of the steel matrix, the properties of the steel are more obvious, so that forging and heat treatment can be performed. After the steps of powder mixing, press molding, sintering, forging, cutting, special treatment, etc., steel-bonded hard alloy products of various specifications and shapes can be obtained.

The toughness index is improved to a greater extent than ordinary cemented carbides, and the hardness can reach 60-70. After forging, cutting and heat treatment, various complex molds can be made, and the application range will be more extensive. The cemented carbide products can be subjected to various heat treatment operations as needed to meet the requirements of different molds in terms of performance. Especially after quenching and tempering, tempered martensite + alloy carbide + evenly distributed hard can be obtained. The typical structure of the phase ensures the strength, hardness, toughness and other performance requirements of the mold material, and at the same time forms an effective wear surface, which improves the wear resistance of the steel-bonded carbide mold.

Flexible use of mold performance requirements and process performance requirements. The steel grade as the steel-bonded cemented carbide substrate and the binder phase can be varied as needed. Compared with alloy molds, steel-bonded carbide molds have higher prices, but the service life of molds can be increased by a factor of ten to several tens of times. It can reduce the amount of molds and the time required to change molds. The key parts of the mold are used to improve the processing quality and processing accuracy of the product. For molds and wear parts with special requirements, such as corrosion resistance, heat resistance, heat conduction, oxidation resistance, etc., when the wear resistance is required, the basic type of the adhesive phase can be adjusted to make it have stainless steel and wear resistance. Steel, high-speed steel and other characteristics to meet the requirements of different occasions.

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