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Preparation method for TNM alloy forging blank with uniform structure

A technology with uniform structure and forged billets, which is applied in metal processing equipment, manufacturing tools, forging/pressing/hammer devices, etc., can solve the problems of high forging temperature, increase the cost of forging billet preparation, rough forging billet structure, etc., and achieve forging The effect of low temperature, avoiding cracking phenomenon, and improving the uniformity of the structure

Active Publication Date: 2019-06-21
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the literature search that although TiAl alloy forging blanks with uniform structure have been obtained by forging, the forging temperature is relatively high, which will not only increase the preparation cost of forging blanks, but also make the structure of forging blanks coarser.

Method used

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  • Preparation method for TNM alloy forging blank with uniform structure
  • Preparation method for TNM alloy forging blank with uniform structure
  • Preparation method for TNM alloy forging blank with uniform structure

Examples

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Embodiment 1

[0034] This embodiment is a method for preparing a TNM alloy forging billet with uniform structure.

[0035] The nominal composition of the TNM alloy described in this implementation example is Ti-43Al-4Nb-1Mo-0.2B, the composition is atomic percentage, and the size of the ingot used is Φ73×99mm.

[0036] The specific process of this embodiment is as follows:

[0037] The first step is preparation before forging. The ingot to be die-cast is a cylindrical sample, and the surface of the ingot to be die-cast is polished to ensure that the surface quality is good and free of defects. Ultrasonic flaw detection is used to confirm that there is no crack inside the ingot, and Y is evenly coated on the surface of the ingot 2 o 3 slurry to avoid surface oxidation of the ingot. After the coating is air-dried, the ingot to be die-cast is wrapped. The sheath is composed of a hollow cylindrical sleeve and two end caps. The material of the sheath is stainless steel with a thickness of 5...

Embodiment 2

[0052] This embodiment is a method for preparing a TNM alloy forging billet with uniform structure.

[0053] The nominal composition of the TNM alloy described in this implementation example is Ti-43Al-4Nb-1Mo-0.2B, the composition is atomic percentage, and the size of the ingot used is Φ73×99mm.

[0054] The specific process described in this embodiment is as follows:

[0055] The first step is preparation before forging. The ingot to be die-cast is a cylindrical sample, and the surface of the ingot to be die-cast is polished to ensure that the surface quality is good and free of defects. Ultrasonic flaw detection is used to confirm that there is no crack inside the ingot, and Y is evenly coated on the surface of the ingot 2 o 3 slurry to avoid surface oxidation of the ingot. After the coating is air-dried, the ingot to be die-cast is wrapped. The sheath is composed of a hollow cylindrical sleeve and two end caps. The material of the sheath is stainless steel with a thic...

Embodiment 3

[0070] This embodiment is a method for preparing a TNM alloy forging billet with uniform structure.

[0071] The nominal composition of the TNM alloy described in this implementation example is Ti-43Al-4Nb-1Mo-0.2B, the composition is atomic percentage, and the size of the ingot used is Φ73×99 mm.

[0072] The specific process described in this embodiment is as follows:

[0073] The first step is preparation before forging. The ingot to be die-cast is a cylindrical sample, and the surface of the ingot to be die-cast is polished to ensure that the surface quality is good and free of defects. Ultrasonic flaw detection is used to confirm that there is no crack inside the ingot, and Y is evenly coated on the surface of the ingot 2 o 3 slurry to avoid surface oxidation of the ingot. After the coating is air-dried, the ingot to be die-cast is wrapped. The sheath is composed of a hollow cylindrical sleeve and two end caps. The material of the sheath is stainless steel with a thi...

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Abstract

The invention discloses a preparation method for a TNM alloy forging blank with the uniform structure. A small-amount and high-frequency forging method is adopted so as to avoid the cracking phenomenon in the TNM alloy forging process; and meanwhile, heat preservation is conducted for the enough time among passes, the sub-dynamic recrystallization phenomenon in the process of heat treatment afterforging is fully utilized, therefore, the uniformity of the structures of all portions of the forging blank is improved, and the TNM alloy forging blank with the fine and uniform structure is obtained. According to the preparation method for the TNM alloy forging blank with the uniform structure, non-isothermal forging is adopted, the forging temperature is low, and the economic benefit can be effectively increased; and in addition, deformation parameters and heat treatment parameters of all the passes are same, and operation is easy.

Description

technical field [0001] The invention relates to the field of intermetallic compound forging and heat treatment, in particular to a method for preparing a TNM alloy forging billet with uniform structure. Background technique [0002] TiAl alloy is a multi-phase alloy, and its structure is often composed of body-centered cubic (BCC), face-centered cubic (FCC), hexagonal close-packed (HCP) and other crystal structure phases, and the phase transformation process is relatively complicated. Moreover, TiAl alloy has the characteristics of low density, high specific strength, and good creep resistance. Its service temperature is 700-850 ° C. It is a light-weight high-temperature structure that is applied to the upper limit of the service temperature of titanium alloys and the lower limit of service temperatures of high-temperature alloys. metallic material. Therefore, TiAl not only has great research value in theory, but also has great potential in industrial application. [0003]...

Claims

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Application Information

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IPC IPC(8): B21J5/00B21J1/06B21K29/00C22F1/18
Inventor 李金山唐斌向林薛祥义寇宏超王军王毅孙智刚
Owner NORTHWESTERN POLYTECHNICAL UNIV
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