7-series aluminum alloy cast ingot for large-specification die forging and control method for hydrogen content of 7-series aluminum alloy cast ingot

Abstract

The invention provides a 7-series aluminum alloy cast ingot for a large-specification die forging. The thickness of the 7-series aluminum alloy cast ingot ranges from 450 mm to 520 mm; the width of the 7-series aluminum alloy cast ingot ranges from 1620 mm to 2000 mm; the hydrogen content of the 7-series aluminum alloy cast ingot is less than or equal to 0.08 ml / 100g.Al. The 7-series aluminum alloy cast ingot for the large-specification die forging is obtained and has stable and low hydrogen content, so that the micro-porosity size of the cast ingot can be remarkably reduced, the metallurgical quality of the cast ingot is improved, and a good foundation is laid for subsequent research and development of new and high-performance aluminum alloy materials. According to the preparation process, the hydrogen content can be stably controlled by utilizing own conditions, so that the internal metallurgical quality of the cast ingot is improved; and the method is simple and clear in process, easy to understand and operate by operators, high in field performability and more suitable for popularization and application of industrial large-scale production.

Description

technical field [0001] The invention belongs to the technical field of preparation of 7-series aluminum alloy ingots, and relates to a 7-series aluminum alloy ingot for large-scale die forgings and a preparation method thereof, in particular to a 7-series aluminum alloy ingot for large-scale die forgings and a Hydrogen content control method of 7-series aluminum alloy ingots for large-scale die forgings. Background technique [0002] 7-series aluminum alloy, that is, Al-Zn-Mg-Cu super duralumin, is widely used in parts manufactured by CNC cutting, suitable for aircraft frames and high-strength accessories. The 7-series aluminum alloy contains zinc and magnesium elements, and zinc is the main alloying element in this series, so the corrosion resistance is quite good. Adding a little magnesium alloy can make the material reach very high strength after heat treatment. This alloy is an ultra-high-strength wrought aluminum alloy that has been used in the aircraft manufacturing i...

AI Technical Summary

Problems solved by technology

[0003] However, due to the high degree of alloying and wide solidification range of the 7-series aluminum alloy, this determines that its alloy ingots are prone to internal metallurgical defects such as micro-porosity and regional composition segregation, and micro-porosity will reduce the quality of the ingot. Mechanical properties, especially for large-scale castings, have a greater impact on their fatigue life and tensile strength

[0004] However, for the existing production of 7 series aluminum alloy ingots, especially the ingots of large-scale die forgings for aerospace, due to strict requirements and large size, the existing conventional production process is based on the production of large-scale ingots of 7 series aluminum alloys. It is easy to fluctuate in the control of melting and casting technology, and it is difficult to meet the index requirements of ingots for large-scale die forgings, resulting in poor quality of ingots

Images