Superfine crystal nickel-based high-temperature alloy and method for preparing same

A nickel-based high-temperature alloy and ultra-fine-grained technology, applied in the field of high-temperature alloy steel, can solve the problems of complex composition and high alloy deformation resistance, and achieve the effects of simple composition, low tonnage requirements, and cost reduction

Inactive Publication Date: 2010-10-13
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complex composition of nickel-based superalloys, the deformation resistance of alloys below 1000 °C is quite high.

Method used

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  • Superfine crystal nickel-based high-temperature alloy and method for preparing same
  • Superfine crystal nickel-based high-temperature alloy and method for preparing same
  • Superfine crystal nickel-based high-temperature alloy and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Alloy 1 in Table 1 is an alloy within the specified composition range of the present invention. Its preparation method is that the raw materials are properly proportioned, then subjected to vacuum induction melting and vacuum arc remelting, and homogenized treatment: heat preservation at 1160°C for 25 hours and heat preservation at 1190°C for 75 hours. Then the billet is opened at 1120°C, and then rolled at 1050°C, and the final rolling temperature is 980°C. figure 1 and figure 2 It is the microstructure photo of Alloy 1 after rolling. It can be seen that the grains of alloy 1 after rolling are uniform and fine, and the grade is ASTM13; granular Nb-rich and Mo-rich precipitates are precipitated on the grain boundaries of the alloy. Due to the high dissolution temperature of the granular precipitated phase, even when heated at a higher temperature, the grain growth rate is very slow, image 3 and Figure 4 These are the comparisons of grain growth trends between the...

Embodiment 2

[0025] Alloy 2 in Table 1 is an alloy within the specified composition range of the present invention. Its preparation method is that the raw materials are properly proportioned, then subjected to vacuum induction melting and vacuum arc remelting, and then homogenized treatment: heat preservation at 1160°C for 25 hours and heat preservation at 1190°C for 75 hours. Then the billet is opened at 1120°C, and then the rolling is started at 1020°C, and the final rolling temperature is 980°C. Alloy 2 has uniform and fine grains after rolling, and its grade is ASTM12.5. The characteristics of the precipitated phase at the grain boundary and the grain growth trend during high-temperature heating are the same as those in Example 1.

Embodiment 3

[0027] Alloy 3 in Table 1 is an alloy within the specified composition range of the present invention. Its preparation method is that the raw materials are properly proportioned, then subjected to vacuum induction melting and vacuum arc remelting, and then homogenized treatment: heat preservation at 1160°C for 25 hours and heat preservation at 1190°C for 75 hours. Then the billet is opened at 1120°C, and then rolled at 1050°C, and the final rolling temperature is 990°C. Alloy 3 has uniform and fine grains after rolling, and its grade is ASTM12. The characteristics of the precipitated phase at the grain boundary and the grain growth trend during high-temperature heating are the same as those in Example 1.

[0028] Table 1 Alloy composition (wt%)

[0029]

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PUM

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Abstract

The invention provides an ultra-fine crystalline nickel base high-temperature alloy and a method for preparing the same, belonging to the high-temperature alloy steel field. The ultra-fine crystalline nickel base high-temperature alloy is particularly applicable to a high-temperature structural component which has high requirement to high-temperature strength and fatigue property, requires superplastic forming and has a complicated structure. The chemical compositions by weight percent of the ultra-fine crystalline nickel base high-temperature alloy are: 17 to 19 percent of Fe, 17 to 20 percent of Cr, 2.8 to 3.3 percent of Mo, 0 to 1.5 percent of W, 0.8 to 1.5 percent of Al, 0.3 to 1.3 percent of Ti, 4.7 to 5.7 percent of Nb, less than or equal to 0.015 percent of C, and the balance beingNi. The preparation method reasonably controls the parameter of a deformation process to allow the deformation temperature to be positioned in a grain boundary precipitated phase region and an austenite phase region which have higher solution temperatures, and uses powerful pinning action of a precipitated phase to the grain boundary to produce the ultra-fine crystalline alloy with a grade of grain fineness of between ASTM12 and ASTM13 grade. Compared with the prior art, the ultra-fine crystalline nickel base high-temperature alloy has simple alloy compositions, greatly reduces the resistanceto deformation during forming, has small loss to forging and rolling equipment, and prevents crystal grains from growing when the ultra-fine crystalline nickel base high-temperature alloy is heated for a long time at a high temperature.

Description

technical field [0001] The invention belongs to the field of alloy steel for high temperature. It is especially suitable for high-temperature alloy parts with high requirements on grain size, especially high-temperature structural parts with high requirements on high-temperature strength and fatigue performance and complex structures requiring superplastic forming. Background technique [0002] The turbine disk is the core part of the engine of aviation and aerospace vehicles. Its working temperature is very high, and the temperature difference from the rim to the hub is very large. During the repeated start-up-stop process of the engine, the temperature changes sharply. , resulting in thermal fatigue. In addition, the rotation speed of the turbine rotor reaches 10,000 revolutions per minute or higher, and the mass of the rotating turbine disk produces a large centrifugal force, and the centrifugal force of the blades on the disk is also transmitted to the disk. The two sup...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C22F1/10
Inventor 董建新付书红谢锡善
Owner UNIV OF SCI & TECH BEIJING
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