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Hot working method for smelting molybdenum rhenium alloy casting ingot by suspending

A molybdenum-rhenium alloy and suspension smelting technology, which is applied in the field of metal pressure processing, can solve problems such as difficult pressure processing, intergranular splitting, and coarse grains of ingots, so as to reduce the amount of dislocation movement, avoid impact, and avoid cracks Effect

Inactive Publication Date: 2008-09-24
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, everything always has two sides. Electron beam suspension smelting also brings unfavorable factors while improving the purity, which is that the crystal grains of the ingot are very coarse.
For molybdenum-rhenium alloys, the crystal grains are particularly easy to grow during smelting, and sometimes a bunch of dendrites appear from the beginning to the end, and the single grain size can reach Above, such a large grain brings great difficulties to pressure processing
Thermal billet opening by forging is prone to intergranular splitting, and it is difficult to process into materials
Extruded blanking material bears compressive stress, and the processing effect will be better, but there are certain requirements for the size of the ingot. When the size of the ingot is small or large, extrusion blanking cannot be performed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] In terms of weight percentage, Mo59% and Re41% in molybdenum-rhenium alloy, put the sintered molybdenum-rhenium alloy bar into a vacuum furnace for electron beam suspension melting to obtain a Φ30×300mm ingot; hot rolling on a plate rolling mill, heating in a hydrogen furnace, The temperature is 1200°C to 1800°C, and the temperature is kept for 1 hour. The first fire is rolled parallel to the ingot and fed axially, the roll line speed is 400mm / min, and is rolled to a thickness of 15mm through three passes. The second heat is heated to 1200°C to 1800°C, and the temperature is maintained for 1 hour. The linear speed of the roll is 400mm / min, and the vertical ingot is fed and rolled to a thickness of 7mm. The heating temperature of the third fire is 1100 ℃ ~ 1700 ℃, heat preservation for 30 minutes, rolling to a thickness of 3mm, annealing and then cold rolling. Qualified molybdenum-rhenium alloy plates with fine grains and uniform size are obtained, with a purity of over...

Embodiment 2

[0018] In terms of weight percentage, Mo75% and Re25% in molybdenum-rhenium alloy, the molybdenum-rhenium alloy sintered strip is put into a vacuum furnace for electron beam suspension melting to obtain a Φ30×300mm ingot, which is hot-rolled on a plate rolling mill and heated by a hydrogen furnace. The temperature is 1200°C to 1800°C, and the temperature is kept for 1 hour. The first fire is rolled parallel to the ingot and fed axially, the roll line speed is 400mm / min, and the thickness is 15mm after three passes. The heating temperature of the second fire is 1200°C-1800°C, heat preservation for 1 hour, the linear speed of the roll is 400mm / min, and the vertical feeding and rolling of the axial direction of the ingot reaches a thickness of 7mm. The heating temperature of the third fire is 1100 ℃ ~ 1700 ℃, heat preservation for 30 minutes, rolling to 3mm thickness, annealing and then cold rolling, and the qualified molybdenum-rhenium alloy plate with fine grain and uniform siz...

Embodiment 3

[0020] In terms of weight percentage, Mo59% and Re41% in molybdenum-rhenium alloy, the molybdenum-rhenium alloy sintered bar is put into a vacuum furnace for electron beam suspension melting, and the ingot size is Φ45×300mm; it is hot-rolled on a plate rolling mill and heated by a hydrogen furnace , temperature 1200 ℃ ~ 1800 ℃, heat preservation for 1 hour, roll line speed 300mm / min, the first fire rolling parallel ingot axial feeding, after three passes to 25mm thick. The second fire time is 1200℃~1800℃, heat preservation for 1 hour, the linear speed of the roll is 300mm / min, and the vertical ingot is axially fed and rolled to a thickness of 10mm. The third fire time is 1100℃~1700℃, heat preservation for 30 minutes, rolling speed 400mm / min, rolling to 3mm thickness in three passes, then cold rolling after annealing, to obtain qualified molybdenum-rhenium alloy plates with fine grains and uniform size. The purity is over 99.99%.

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PUM

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Abstract

The invention discloses a thermal processing method for suspension electron beam melting molybdenum-rhenium alloy ingot. The method obtains rod-shaped ingot by melting a molybdenum-rhenium alloy sintered bar through suspension electron beam. The high temperature rolling is carried out by the first fire, the parallel ingot is axially fed, with a rolling speed ranging from 300 to 400mm / min, the temperature is kept for 1 hour; the ingot is rolled to the set thickness through rolling for three times and heated at high temperature for the second time, the temperature is kept for 1 hour, with a rolling speed ranging from 300 to 400mm / min; the ingot is rolled to the set thickness after inverting the direction; the ingot is heated at high temperature for the third time, the temperature is kept for half an hour; the ingot is rolled to the set thickness through 3 rolling for three times and is carried for cold rolling after annealing. The thermal processing method provided by the invention reduces the dislocation movement for single sliding and the speed of the dislocation movement, controls the direction of the dislocation movement, avoids the cracking at crystal boundary owing to the accumulation of the dislocation; besides, the thermal processing method ensures cogging of the ingot but not cracking, and ensures heating processing to go on smoothly. By the thermal processing method, accepted plank stuff characterized by fine crystal particles and uniform sizes can be made, with purity over 99.99 percent.

Description

technical field [0001] The invention belongs to the technical field of metal pressure processing, and relates to a thermal processing method for alloy ingots, in particular to a thermal processing method for suspension melting molybdenum-rhenium alloy ingots. Background technique [0002] Molybdenum-rhenium alloy materials used in electric vacuum devices have high requirements on impurity content, especially gas impurity content. The purpose is to reduce the outgassing of materials at high temperatures and improve the performance stability and service life of components. The most effective way to reduce impurity content and improve material purity is to carry out electron beam suspension melting on raw materials. This melting method uses electron beam bombardment in a vacuum chamber to melt the material, and the lower base extends out of the crucible to accept the molten material. The surface tension keeps the molten pool stable and does not overflow. With the bombardment, t...

Claims

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Application Information

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IPC IPC(8): B21B1/22B21B37/00B21B37/74B21B37/46
Inventor 张军良李中奎付洁郑欣张清殷涛
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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