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Heat treatment method for balancing and improving impact toughness and Rp0.02 of 1Cr12Ni3Mo2VNbN blade steel

A heat treatment method and impact toughness technology, which is applied in the heat treatment process of turbine blades and the heat treatment process of martensitic stainless steel turbine blades, can solve problems such as unqualified workpieces, achieve toughness and strength improvement, balance and improve impact toughness , the effect of reducing material brittleness

Active Publication Date: 2019-03-26
WUXI TURBINE BLADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, after thermal processing of 1Cr12Ni3Mo2VNbN blade steel, it is often difficult to obtain the workpiece to meet the above-mentioned impact toughness and strength requirements at the same time, resulting in unqualified workpiece

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This embodiment provides a heat treatment method to balance and improve the impact toughness and Rp0.02 of 1Cr12Ni3Mo2VNbN blade steel, the method is:

[0035] (1) Put the quenched 1Cr12Ni3Mo2VNbN blade steel evenly in the general-purpose tempering basket, then put the tempering basket into the tempering furnace and heat it up to 580°C with the furnace and keep it warm for 6 hours. After the heat preservation is completed, it is out of the furnace air-cooled to room temperature;

[0036] (2) Evenly put the blade steel cooled in step (1) back into the tempering basket, then put the tempering basket into the tempering furnace and heat it up to 530°C with the furnace and keep it warm for 6 hours. Natural cooling in the air.

Embodiment 2

[0038] This embodiment provides a heat treatment method to balance and improve the impact toughness and Rp0.02 of 1Cr12Ni3Mo2VNbN blade steel, the method is:

[0039] (1) Put the quenched 1Cr12Ni3Mo2VNbN blade steel evenly in a general-purpose tempering basket, then put the tempering basket into the tempering furnace and heat it up to 590°C with the furnace and keep it warm for 5 hours. After the heat preservation is completed, it is out of the furnace oil cooled to room temperature;

[0040] (2) Evenly put the blade steel cooled in step (1) back into the tempering basket, then put the tempering basket into the tempering furnace and heat it up to 540°C with the furnace and keep it warm for 5 hours. cool down.

Embodiment 3

[0042] This embodiment provides a heat treatment method to balance and improve the impact toughness and Rp0.02 of 1Cr12Ni3Mo2VNbN blade steel, the method is:

[0043](1) Put the quenched 1Cr12Ni3Mo2VNbN blade steel evenly in the general-purpose tempering basket, then put the tempering basket into the tempering furnace and heat it up to 600°C with the furnace and keep it warm for 4 hours. After the heat preservation is completed, it is out of the furnace water cooled to room temperature;

[0044] (2) Evenly put the blade steel cooled in step (1) back into the tempering basket, then put the tempering basket into the tempering furnace and heat it up to 550°C with the furnace and keep it warm for 3 hours. After cooling for 2 hours, let it cool naturally in the air.

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Abstract

The invention relates to a heat treatment method for balancing and improving the impact toughness and Rp0.02 of 1Cr12Ni3Mo2VNbN blade steel. The heat treatment method for balancing and improving the impact toughness and Rp0.02 of the 1Cr12Ni3Mo2VNbN blade steel comprises the steps that after being quenched, the 1Cr12Ni3Mo2VNbN blade steel is heated to the temperature of 580-620 DEG C, is maintained at the temperature and then is rapidly cooled; and the cooled blade steel is heated to the temperature of 530-550 DEG C, is maintained at the temperature and is then slowly cooled. According to theheat treatment method for balancing and improving the impact toughness and Rp0.02 of the 1Cr12Ni3Mo2VNbN blade steel, the 1Cr12Ni3Mo2VNbN blade steel is tempered twice after being quenched, and the temperature and cooling process of the 1Cr12Ni3Mo2VNbN blade steel are adjusted, so that the toughness and strength of the 1Cr12Ni3Mo2VNbN blade steel are further improved on the premise that the impactvalue is equal to or greater than 35J and the Rp0.02 is equal to or greater than 866Mpa, and the purpose of balancing and improving the impact toughness and Rp0.02 of the 1Cr12Ni3Mo2VNbN blade steelis realized; and the heat treatment method has good application prospects.

Description

technical field [0001] The invention relates to the field of heat treatment technology for turbine blades, in particular to the field of heat treatment technology for martensitic stainless steel turbine blades, and in particular to a heat treatment method for balancing and improving the impact toughness and Rp0.02 of 1Cr12Ni3Mo2VNbN blade steel. Background technique [0002] Turbine blades are important components used in turbomachinery (such as steam turbines, gas turbines, water turbines, etc.) to guide the fluid to flow in a certain direction and drive the rotor to rotate. The blades installed on the casing are called stationary blades or guide vanes, and the blades installed on the rotor are called moving blades. 1Cr12Ni3Mo2VN is a martensitic stainless heat-resistant steel containing chromium, nickel, molybdenum, vanadium, and nitrogen. It has good toughness, high strength, and good corrosion resistance. It is often used as supercritical unit blades. [0003] Compared ...

Claims

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Application Information

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IPC IPC(8): C21D6/00C21D1/18
CPCC21D1/18C21D6/004
Inventor 刘新权张忠周扬丁栋孙风军封嗣虎宗明明门若男
Owner WUXI TURBINE BLADE