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Process method for controlling cooling rate of heat treatment of superalloy products

A heat treatment cooling and superalloy technology, which is applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve the problems of slow superalloy performance, defects, too fast cooling speed of solid solution heat treatment, etc., and achieve good comprehensive performance and low price , Eliminate the effect of notch sensitivity

Inactive Publication Date: 2018-09-07
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a process for controlling the cooling rate of heat treatment of superalloy products, so that the strengthening phase of superalloy products can be precipitated reasonably, and good comprehensive performance can be obtained, thereby solving the problem that the cooling rate of existing solid solution heat treatment is too fast or too high. The problem of slow causing performance defects of superalloys

Method used

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  • Process method for controlling cooling rate of heat treatment of superalloy products
  • Process method for controlling cooling rate of heat treatment of superalloy products
  • Process method for controlling cooling rate of heat treatment of superalloy products

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Embodiment 1

[0041] This embodiment provides a process method for controlling the cooling rate of heat treatment of high-temperature alloy products. Specifically, an aluminum silicate fiber felt sheath is used as an insulating layer to control the cooling rate. The high-temperature alloy products are made of 13-16% by weight of Cr, 9~ 11% Co, 4.5 to 5.5% Mo, 2.4 to 2.8% Ti, 2.4 to 2.8% Nb, 2.4 to 2.8% Al and the rest are Ni-based deformed high-temperature alloy turbine disk die forgings (ie nickel-based High-temperature alloy turbine disk), using the existing air cooling, furnace cooling and the process method of the present invention to heat treat the high-temperature alloy turbine disk die forging, the solution temperature is 1120±10°C, and the holding time is 8 hours;

[0042] The process of using the process method of the present invention to process the high-temperature alloy turbine disk die forging is as follows:

[0043] (A) At room temperature, use steel tape or soft-coated powder to c...

Embodiment 2

[0052] This embodiment provides a process method for controlling the cooling rate of heat treatment of high-temperature alloy products. Specifically, a thermal insulation coating is used as the thermal insulation layer to control the cooling rate.

[0053] The high temperature alloy products are made of 13-16% Cr, 9-11% Co, 4.5-5.5% Mo, 2.4-2.8% Ti, 2.4-2.8% Nb, 2.4-2.8% Al and The rest is a Φ110mm deformed high-temperature alloy test bar composed of Ni. The heat treatment is carried out using the existing air cooling, furnace cooling and the process of applying the heat preservation coating of the present invention. The solution temperature is 1120±10℃, and the heat preservation time is 8 hours. .

[0054] Using the process method of the present invention to process the superalloy test bar, the steps are as follows:

[0055] (a) Use alcohol or acetone to remove oil stains on the surface of the bar;

[0056] (b) Add water to the thermal insulation coating and stir to form a uniform p...

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Abstract

The invention discloses a method for controlling the heat treatment cooling speed of a high temperature alloy product, and belongs to the field of preparation of high temperature alloy products. The method comprises the following steps: coating the high temperature alloy product with a heat insulation material to form a heat insulation layer; heating the heat insulation layer coated high temperature alloy product to a temperature prescribed for solid solution heat treatment, and carrying out heat insulation for a period of time until the strengthening phase gamma' of the high temperature alloy product is partially or completely dissolved; cooling the heat insulation layer coated high temperature alloy product to a preset temperature, and removing the heat insulation layer coated on the high temperature alloy product; and carrying out ageing treatment on the heat insulation layer removed high temperature alloy product through a routine process. The method allows the high temperature alloy product to be coated with the heat insulation material to form the heat insulation layer and uses the heat insulation layer to control the heat treatment cooling speed of the high temperature alloy product, so the precipitation rule of the strengthening phase gamma' is controlled, and the notch sensitivity brought by air cooling and the great strength attenuation brought by furnace cooling are eliminated, thereby the high temperature alloy product has good comprehensive performances.

Description

Technical field [0001] The invention relates to the field of high-temperature alloy processing, in particular to a process method for controlling the heat treatment cooling rate of high-temperature alloy products. Background technique [0002] Superalloys refer to a class of materials that can be used for a long time above 650°C, have good oxidation resistance, corrosion resistance, excellent stretching, durability, fatigue properties and long-term organizational stability. It is usually based on the main group VIII elements (iron, cobalt, nickel, etc.), and a large amount of strengthening elements are added to form an alloy. The performance of nickel-based precipitation-strengthened superalloys mainly depends on the precipitation-strengthening phase γ′[Ni 3 (AlTi)], the number, size, morphology and distribution of γ'phase have a direct impact on the properties of the alloy. When the superalloy is formed, heat treatment is mainly used to control the precipitation of γ'phase. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/70C21D11/00
Inventor 秦鹤勇张北江赵光普胥国华
Owner CENT IRON & STEEL RES INST