Method for improving hardness of tungsten alloy

Abstract

The invention discloses a method for improving the hardness of tungsten alloy, which comprises the following steps: Step 1, weighing metal powder; Step 2, mixing materials; Step 3, isostatic pressing; Step 4, sintering; , take an appropriate amount of tungsten powder, nickel powder, iron powder and chromium powder respectively; Mix in the middle to obtain mixed powder; the mass percentage of tungsten powder in the mixed powder is 85%~98%, the mass ratio of nickel powder and iron powder in the described mixed powder is (1.8~3.0): 1, Cr adds The content is in the range of 0.04% to 2.0%. The sintered tungsten alloy of the present invention can increase the hardness of the tungsten alloy by adding the element Cr without further treatment by other methods, so that the hardness of the tungsten alloy can reach above HRC31, which can better meet the needs of people's production and life. .

Description

technical field [0001] The invention relates to the technical field of powder metallurgy and the application of tungsten-based alloys, in particular to a method for increasing the hardness of tungsten alloys. Background technique [0002] Tungsten-based alloys have the characteristics of high density, high strength and hardness, good electrical and thermal conductivity, low thermal expansion coefficient, strong radiation absorption ability, high pressure resistance, and excellent electrical corrosion resistance, which are conducive to machining, welding, forging and heat treatment. , plays an irreplaceable role in the fields of national defense, aerospace, electronic information, energy, metallurgy, machining and nuclear industry, occupies an important position in the national economy, and has become one of the most active research fields in the field of materials science . [0003] In recent years, with the development of science and technology, higher requirements have be...

AI Technical Summary

Problems solved by technology

Generally speaking, the HRC hardness of tungsten-based alloys is between 24 and 32. At present, tungsten-based alloy products with high hardness special-shaped parts, plates and spheres are required in the market, and the alloy HRC hardness is required to be ≥ 31. Now it can only rely on forging deformation treatment. This hardness is achieved, but the production process is complicated and the investment in equipment is large, resulting in high production costs, low profits, and lack of market competitiveness; at the same time, some products are limited by extremely small size or complex shape, so it is not suitable to use deformation strengthening to improve hardness , it is not yet possible to produce and put into the market

[0004] Generally speaking, the HRC hardness of tungsten-based alloys is between 24 and 32. At present, tungsten-based alloy products with high hardness special-shaped parts, plates and spheres are required in the market, and the alloy HRC hardness is required to be ≥ 31. Now it can only rely on forging deformation treatment. This hardness is achieved, but the production process is complicated and the investment in equipment is large, resulting in high production costs, low profits, and lack of market competitiveness; at the same time, some products are limited by extremely small size or complex shape, so it is not suitable to use deformation strengthening to improve hardness , it is not yet possible to produce and put into the market