A forming method for extra-thick, fine-grained, high-strength and toughness magnesium alloy forgings

Abstract

The invention relates to a shaping method of a magnesium alloy forging with extra thickness, fine grain as well as high strength and toughness, and belongs to the technical field of non-ferrous metal processing. The method realizes refinement of crystal grain size of the magnesium alloy forging with extra thickness, high strength and high toughness are considered, and the forging can be applied to manufacture of components of strategic missiles. The method can be successfully enforced, and the forging has important technical support effects for structure weight reduction of strategic missiles.

Description

technical field [0001] The invention relates to a forming method of an extra-thick, fine-grained, high-strength and tough magnesium alloy forging, which belongs to the technical field of non-ferrous metal processing. The thickness of the forging is more than 150 mm, and the grain size is less than 10 μm. The tensile strength of the mechanical properties is not less than 310MPa, and the elongation in the thickness direction is not less than 5%. Background technique [0002] With the increasingly urgent demand for weight reduction of strategic missile weapons and equipment, it is difficult to achieve the goal of substantial structural weight reduction by using the original structural materials for optimal design. However, the use of new magnesium alloys to partially replace the original aluminum alloy materials can The purpose of greatly reducing the structural weight of the missile can be achieved, so that various performance indicators such as the range and maneuverability o...

AI Technical Summary

Problems solved by technology

The main problems are: 1. Usually, magnesium alloys belong to the close-packed hexagonal crystal structure, and its slip system is less, which determines that the plastic processing ability of magnesium alloys is poor. In addition, high-strength magnesium alloys are magnesium alloys with high alloying element content. Less plasticity than conventional magnesium or magnesium alloys

Therefore, the forming temperature process window of high-strength magnesium alloy extra-thick forgings is narrow, and there is a problem of cracking during the forging process; 2. Small-scale magnesium alloy materials have excellent mechanical properties, the main reason is that it is easy to prepare fine-grained structures through plastic processing, but There is an obvious "amplification effect" in its microstructure and properties. Because the deformation temperature and deformation amount are not easy to control, the grains of large-scale forgings are easy to grow and coarsen, resulting in low mechanical properties.

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