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A heat treatment method for reducing the yield ratio of 2cr12ni4mo3vnbn turbine blades

A heat treatment method and turbine blade technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve problems such as high yield ratio, failure to meet technical requirements, reduction, etc., and achieve the effect of reducing yield ratio and yield strength

Active Publication Date: 2019-06-04
WUXI TURBINE BLADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

2Cr12Ni4Mo3VNbN is a blade steel material with better comprehensive properties. It not only requires high strength and high toughness, but also requires an appropriate yield ratio. The yield ratio of 2Cr12Ni4Mo3VNbN is required to be ≤0.85. 0.86-0.90), does not meet the technical requirements
[0006] However, in the actual application process of 2Cr12Ni4Mo3VNbN turbine blades, the yield strength ratio is relatively high and needs to be further reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] First, solution heat treatment is carried out, that is, the 2Cr12Ni4Mo3VNbN blade is placed in a general-purpose quenching basket, and then the quenching basket is placed in a quenching furnace and heated to 1050 ° C, kept for 3 hours, and then oil-cooled. Then temper once at 560°C for 4 hours, cool in the furnace for 4 hours, then air cool to room temperature. Then temper for the second time at 580 ° C for 5 hours, and cool to room temperature in air.

Embodiment 2

[0039] First, solution heat treatment is carried out, that is, the 2Cr12Ni4Mo3VNbN blade is placed in a general-purpose quenching basket, and then the quenching basket is placed in a quenching furnace and heated to 1080 ° C, kept for 1 hour, and then air-cooled. Then a tempering first at 450 ° C for 4 hours, then heat up to 550 ° C for 5 hours with the furnace, and air cool to room temperature. Then temper for the second time at 570 ° C for 5 hours, and cool to room temperature in air.

Embodiment 3

[0041]First, solution heat treatment is carried out, that is, 2Cr12Ni4Mo3VNbN blades are placed in a general-purpose quenching basket, and then the quenching basket is placed in a quenching furnace and heated to 1065 ° C, kept for 2 hours, and then oil-cooled. Then temper once at 530°C for 4 hours, cool in the furnace for 4 hours, then air cool to room temperature. Then temper for the second time at 560 ° C for 5 hours, and cool to room temperature in air.

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PUM

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Abstract

The invention provides a heat treatment method for reducing the yield ratio of a 2Cr12Ni4Mo3VNbN turbine blade. The heat treatment method comprises the following steps that 1, solid solution treatmentis carried out, wherein the 2Cr12Ni4Mo3VNbN turbine blade is subjected to heat treatment, and then is cooled to the room temperature; 2, primary tempering heat treatment is carried out, wherein the 2Cr12Ni4Mo3VNbN turbine blade subjected to the solid solution treatment in the step 1 is subjected to the primary tempering treatment, and then is cooled to the room temperature; and 3, secondary tempering treatment is carried out, wherein the 2Cr12Ni4Mo3VNbN turbine blade subjected to the primary tempering treatment in the step 2 is subjected to the secondary tempering heat treatment, and then iscooled to the room temperature. According to the heat treatment method for reducing the yield ratio of the 2Cr12Ni4Mo3VNbN turbine blade, the yield ratio is reduced, and the phenomena of blade reworking and even scrapping caused by the slightly higher yield ratio are effectively avoided.

Description

technical field [0001] The invention belongs to the technical field of high-alloy steel heat treatment technology, and relates to a heat treatment method for reducing the yield ratio of 2Cr12Ni4Mo3VNbN turbine blades. 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. In order to prevent the surface peeling, wear or damage of the blades due to the operating load, which may cause safety hazards to the operation, the turbine blades are generally made of chromium-containing stainless steel. [0003] Since the 21st century, the increasing demand for large-tonnage equipment has put forward new requirements for the performance of stainless steel used in turbine blades. 2Cr12Ni4Mo3VNbN is a blade steel material with better comprehensive properties. It not only requires high strength and high toughnes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/00C21D6/00
CPCC21D6/004C21D9/0068
Inventor 刘新权宗明明张星星门若男孙风军封嗣虎周扬尹林
Owner WUXI TURBINE BLADE