A kind of tungsten-based heavy alloy rod with hardness gradient change and preparation method thereof

Abstract

The invention relates to a tungsten-based heavy alloy bar with the gradient-changing hardness and a producing method thereof and belongs to the technical field of powder metallurgy. Gradient distribution areas with the continuously-changing hardness are formed in the radial direction of the tungsten-based heavy alloy bar, and the area, with the largest hardness, in the gradient distribution areas with the continuously-changing hardness in the tungsten-based heavy alloy bar is the surface of the tungsten-based heavy alloy bar. The producing method of the tungsten-based heavy alloy bar includes the steps that a W-Ni-Fe alloy bar is used as a pack cementation object, a solid solution element is packed into the W-Ni-Fe alloy bar in a cementation manner through pack cementation treatment on the vacuum condition, and the tungsten-based heavy alloy bar with the gradient-changing hardness is obtained. The structural design of the bar is reasonable, the producing method is simple and controllable, and the performance of obtained finished products is excellent and stable. According to the tungsten-based heavy alloy bar and the producing method, industrial production and application are facilitated.

Description

technical field [0001] The invention relates to a tungsten-based heavy alloy rod with gradient hardness changes and a preparation method thereof, belonging to the technical field of powder metallurgy. Background technique [0002] The development of self-sharpening heavy alloys is the development direction of armor-piercing projectile core materials. Due to its excellent self-sharpening properties, the depleted uranium composite material is currently the most excellent armor-piercing bullet core material. In the early 1990s, based on international public opinion and environmental pressure caused by the toxicity of depleted uranium materials, the United States began to develop alternative depleted uranium armor-piercing core materials. Based on the W-Ni-Fe series heavy alloy, the researchers changed the microstructure of the alloy, such as increasing the tungsten grain size, improving the design of the phase interface structure, the design of the geometric shape of the bulle...

AI Technical Summary

Problems solved by technology

However, a large amount of deformation usually leads to a sharp decrease in the overall elongation (ie, toughness) of the tungsten-based heavy alloy rod, which increases the risk of the core material of the armor-piercing projectile breaking when it is launched and hits the target.