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Hot Extrusion Process of Nickel-based Alloy Rods

A nickel-based alloy, hot extrusion technology, applied in the field of metallurgy, can solve the problems of lack of accuracy, high experience value requirements, boring cars, etc., to reduce workload and cost waste, reduce experience requirements, and improve work efficiency. Effect

Active Publication Date: 2018-12-25
太原钢铁(集团)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the choice is unreasonable, defects such as stuffy car, surface fish scale cracks, and head warping often occur
[0004] At present, the hot extrusion method is used to produce bars. It is very difficult to accurately select a suitable hot extrusion die for specific production requirements, such as process requirements. The selection process is time-consuming and laborious, and the accuracy is not guaranteed. Repeated trials and explorations are required.
Even if it is successful, experienced masters are often needed to select the hot extrusion die based on experience, which requires high experience.

Method used

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  • Hot Extrusion Process of Nickel-based Alloy Rods
  • Hot Extrusion Process of Nickel-based Alloy Rods
  • Hot Extrusion Process of Nickel-based Alloy Rods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In this embodiment, the hot-extruded nickel-based alloy rod has the following mass percentage distribution of main components: Ni base, 22% Cr, 12% Co, 9% Mo, 1.2% Al, 0.44% Ti.

[0036] S01), calculate the target angle value α of the hot extrusion die according to the following formula 0 , the formula is:

[0037]

[0038] Among them, π is the circumference ratio, the value is 3.14; P is the extrusion ratio; V is the extrusion exit velocity of the hot extrusion die, the unit is m / s; Q is the dynamic recrystallization activation energy of the nickel-based alloy, and its value can be found in the literature Obtained from the query in KJ / mol; T is the thermodynamic temperature of hot extrusion, and the unit is K.

[0039] In this embodiment, the dynamic recrystallization activation energy of the nickel-based alloy is 549KJ / mol. The extrusion ratio is 5, the extrusion speed is 3m / s, and the extrusion temperature is 1220°C. Put the known parameters into the above form...

Embodiment 2

[0053] In this embodiment, the mass percentage ratio of the main components of the hot-extruded nickel-based alloy rod is:

[0054] Ni base, 22% Cr, 9% Mo, 5% Nb, 0.2% Ti.

[0055] S01), calculate the target angle value α of the hot extrusion die according to the following formula 0 , the formula is:

[0056]

[0057] Among them, π is the circumference ratio, the value is 3.14; P is the extrusion ratio; V is the extrusion exit velocity of the hot extrusion die, the unit is m / s; Q is the dynamic recrystallization activation energy of the nickel-based alloy, and its value can be found in the literature Obtained from the query in KJ / mol; T is the thermodynamic temperature of hot extrusion, and the unit is K.

[0058] In this embodiment, the dynamic recrystallization activation energy of the nickel-based alloy is 522KJ / mol. The extrusion ratio is 4, the extrusion speed is 4m / s, and the extrusion temperature is 1220°C. Put the known parameters into the above formula to get: ...

Embodiment 3

[0072] In this embodiment, the mass percentage ratio of the main components of the hot-extruded nickel-based alloy rod is:

[0073] Ni base, 25% Cr, 20% Co, 0.5% Mo, 1.5% Nb, 1.3% Ti, 1.3% Al.

[0074] S01), calculate the target angle value α of the hot extrusion die according to the following formula 0 , the formula is:

[0075]

[0076] Among them, π is the circumference ratio, the value is 3.14; P is the extrusion ratio; V is the extrusion exit velocity of the hot extrusion die, the unit is m / s; Q is the dynamic recrystallization activation energy of the nickel-based alloy, and its value can be found in the literature Obtained from the query in KJ / mol; T is the thermodynamic temperature of hot extrusion, and the unit is K.

[0077] In this embodiment, the dynamic recrystallization activation energy of the nickel-based alloy is 537KJ / mol. The extrusion ratio is 5, the extrusion speed is 4m / s, and the extrusion temperature is 1180°C. Put the known parameters into the a...

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Abstract

The invention discloses a nickel base alloy bar hot extrusion technology. The nickel base alloy bar hot extrusion technology comprises following steps: a, according to the following formula, the target angle value alpha0 of a heat extrusion die is calculated, the formula is shown in the specification, the value of pion is 3.14, P is the extrusion ratio, V is the extrusion outlet speed of the hot extrusion die, Q is nickel base alloy dynamic recrystallization activation energy, and T is the thermodynamics temperature of hot extrusion; b, according to the calculated target angle value alpha0 of the hot extrusion die, the hot extrusion die is selected. Through the hot extrusion technology, the specific bar heat extrusion process flow is rapidly and efficiently formulated, the manufactured bar is free of surface scale cracks, warping and other defects, the bar size approaches to the finished product size, and the surface can meet the requirement through the simple grinding and polishing; in the machining process, heat extrusion blocking run does not exist.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a nickel-based alloy rod hot extrusion process. Background technique [0002] Nickel-based alloys are widely used in aviation, aerospace, energy and petrochemical fields due to their excellent comprehensive mechanical properties such as corrosion resistance and oxidation resistance. Due to a series of characteristics of nickel-based alloys, such as high element content, high thermal deformation resistance, narrow processable temperature range, and difficult structure control, how to improve production efficiency, yield rate, and realize comprehensive control of structure and performance is particularly important. For nickel-based alloy rods, free forging or diameter forging is widely used at present. [0003] For free forging, multiple thickening and elongation processes are usually used, so that the as-cast structure is completely broken, and the grains are fine and uniform....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C23/08B21C31/00B21C25/02
CPCB21C23/08B21C25/02B21C31/00
Inventor 徐芳泓王岩王烽方旭东刘伟康喜唐
Owner 太原钢铁(集团)有限公司
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