Heat treatment and freezing treatment method for 9% Ni material

A treatment method, 9% ni technology, applied in the field of material heat treatment, can solve problems such as locking or vibration exceeding the standard, component size changes, etc., to achieve the effect of solving the problem of abnormal operation

Pending Publication Date: 2022-03-25
大连透平机械技术发展有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a heat treatment and freezing treatment method of 9% Ni material that can avoid the transformation of retained austenite structure into martensite structure in low temperature service environment, so as to solve the problem of the parts of 9% Ni material Dimensional changes of components caused by phase change during low temperature service, avoiding engineering accidents such as parts locked or vibration exceeding the standard in low temperature service environment

Method used

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  • Heat treatment and freezing treatment method for 9% Ni material
  • Heat treatment and freezing treatment method for 9% Ni material
  • Heat treatment and freezing treatment method for 9% Ni material

Examples

Experimental program
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Effect test

Embodiment 1

[0033] The low-temperature compressor parts made of 9% Ni are placed in a heat treatment furnace and nitrogen for heat treatment and freezing treatment, which sequentially includes quenching treatment, secondary quenching, tempering treatment, freezing treatment and secondary tempering treatment. The chemical composition and weight percentage of the 9% Ni material are: C≤0.10%; Mn≤0.80%; P≤0.025%; S≤0.025%; Si: 0.15-0.35%; Cu≤0.30%; 9.5%; Cr≤0.30%; Fe: balance. in,

[0034] Quenching treatment: at a heating rate of 80°C / hour, the temperature in the heat treatment furnace was raised to 815°C for 2 hours, and then water cooled to room temperature.

[0035] Secondary quenching treatment: at a heating rate of 70° C. / hour, the temperature in the heat treatment furnace was raised to 665° C., kept for 3 hours, and then water-cooled to room temperature.

[0036] Tempering treatment: raise the temperature in the heat treatment furnace to 585° C. at a heating rate of 50° C. / hour, keep...

Embodiment 2

[0046]The low-temperature compressor parts made of 9% Ni are placed in a heat treatment furnace and nitrogen for heat treatment and freezing treatment, which sequentially includes quenching treatment, secondary quenching, tempering treatment, freezing treatment and secondary tempering treatment. The chemical composition and weight percentage of the 9% Ni material are: C≤0.10%; Mn≤0.80%; P≤0.025%; S≤0.025%; Si: 0.15-0.35%; Cu≤0.30%; 9.5%; Cr≤0.30%; Fe: balance. in,

[0047] Quenching treatment: With a heating rate of 90°C / hour, the temperature in the heat treatment furnace was raised to 820°C, kept for 1.5 hours, and then water-cooled to room temperature.

[0048] Secondary quenching treatment: raise the temperature in the furnace to 670°C at a heating rate of 60°C / hour, keep the temperature for 2.5 hours, and then cool to room temperature with water.

[0049] Tempering treatment: Raise the temperature in the furnace to 590°C at a heating rate of 75°C / hour, keep the temperatu...

Embodiment 3

[0059] The low-temperature compressor parts made of 9% Ni are placed in a heat treatment furnace and nitrogen for heat treatment and freezing treatment, which sequentially includes quenching treatment, secondary quenching, tempering treatment, freezing treatment and secondary tempering treatment. The chemical composition and weight percentage of the 9% Ni material are: C≤0.10%; Mn≤0.80%; P≤0.025%; S≤0.025%; Si: 0.15-0.35%; Cu≤0.30%; 9.5%; Cr≤0.30%; Fe: balance. in,

[0060] Quenching treatment: at a heating rate of 100°C / hour, the temperature in the heat treatment furnace was raised to 825°C, kept for 1 hour, and then water-cooled to room temperature.

[0061] Secondary quenching treatment: raise the temperature in the heat treatment furnace to 675° C. at a heating rate of 90° C. / hour, keep the temperature for 2 hours, and then cool to room temperature with water.

[0062] Tempering treatment: Raise the temperature in the heat treatment furnace to 595°C at a heating rate of ...

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Abstract

The invention provides a heat treatment and freezing treatment method of a 9% Ni material, which is suitable for treating the 9% Ni material for preparing a large compressor rotor part or other low-temperature service environment parts, and sequentially comprises the treatment processes of quenching treatment, secondary quenching, tempering treatment, freezing treatment, secondary tempering treatment and the like. According to the heat treatment and freezing treatment method for the 9% Ni material, provided by the invention, a retained austenite structure can be prevented from being converted into a martensite structure in a low-temperature service environment, and the problem of part size change caused by phase change of a part made of the 9% Ni material in the low-temperature service process is solved; and engineering accidents such as locking or excessive vibration of the component in a low-temperature service environment are avoided.

Description

technical field [0001] The invention belongs to the technical field of material heat treatment, in particular to a method for heat treatment and freezing treatment of 9% Ni material. Background technique [0002] 9% Ni material is often used to prepare large compressor rotor parts serving in various low temperature environments. The rotor parts made of this material are subjected to heat treatment and run in low temperature conditions. The residual austenite structure in the structure is transformed into a martensite structure, which in turn causes the macroscopic size of the components to become larger, resulting in failures such as unit lockup and excessive vibration. Especially for larger-sized rotor parts made of 9% Ni material, since the 9% Ni material used to prepare large-sized rotor parts undergoes conventional heat treatment, the amount of retained austenite in the structure is more, which will lead to more severe problems. obvious. [0003] Therefore, there is an...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D6/04C22C38/04C22C38/02C22C38/16C22C38/08C22C38/40C22C38/42
CPCC21D1/18C21D6/04C22C38/04C22C38/02C22C38/16C22C38/08C22C38/40C22C38/42C21D6/001C21D6/004C21D6/005C21D6/008C21D2211/001
Inventor 包翠敏陈蕊杨智鹏孙奇陈炜邹鹏郭婷
Owner 大连透平机械技术发展有限公司
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