Annealing heat treatment method for eliminating residual stress of HastelloyC-276 thin-wall spinning shielding sleeve

An annealing heat treatment and residual stress technology, applied in heat treatment furnaces, heat treatment equipment, process efficiency improvement, etc., can solve the problems that no scholars have proposed to reduce the residual stress of Hastelloy C-276 thin-walled spinning shielding sleeve, so as to reduce residual stress, The effect of reducing residual stress

Inactive Publication Date: 2019-09-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, in the published invention patents, no scholars have proposed a method to reduce the residual stress of the Hastelloy C-276 thin-wall spinning shielding sleeve

Method used

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  • Annealing heat treatment method for eliminating residual stress of HastelloyC-276 thin-wall spinning shielding sleeve
  • Annealing heat treatment method for eliminating residual stress of HastelloyC-276 thin-wall spinning shielding sleeve
  • Annealing heat treatment method for eliminating residual stress of HastelloyC-276 thin-wall spinning shielding sleeve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Step 1: Carry out spin forming on Hastelloy C-276 thin-walled shielding sleeve blank, the process parameters of spinning forming are: feed ratio 0.8mm / r, thinning rate 44.1%, mandrel speed 90r / min;

[0019] Step 2: Perform annealing heat treatment on the shielding sleeve after spinning, the annealing temperature is 700°C, and the holding time is 60 minutes;

[0020] Step 3: After the annealing heat treatment is completed, immediately take out the shielding sleeve and air cool to room temperature. The schematic diagram of the process flow of Example 1 is as follows: figure 2 shown.

[0021] The residual stress of the thin-walled shielding sleeve after spinning and annealing heat treatment was measured, and the results are shown in Table 1. In order to prove the feasibility of the method of the present invention, the measured value of the residual stress of the shielding sleeve after spinning and Example 1 is compared in Table 1. It can be seen that in Example 1, the th...

Embodiment 2

[0023] Step 1: Carry out spin forming on Hastelloy C-276 thin-walled shielding sleeve blank, the process parameters of spinning forming are: feed ratio 0.8mm / r, thinning rate 44.1%, mandrel speed 90r / min;

[0024] Step 2: Perform annealing heat treatment on the shielding sleeve after spinning, the annealing temperature is 700°C, and the holding time is 120 minutes;

[0025] Step 3: After the annealing heat treatment is completed, immediately take out the shielding sleeve and air-cool to room temperature. The schematic diagram of the process flow of Example 2 is as follows image 3 shown.

[0026] The residual stress of the thin-walled shielding sleeve after spinning and annealing heat treatment was measured, and the results are shown in Table 1. In order to prove the feasibility of the method of the present invention, comparing the measured values ​​of the residual stress of the shielding sleeve after spinning in Table 1 with that of Example 2, it can be seen that in Example ...

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Abstract

The invention discloses an annealing heat treatment method for eliminating residual stress of a HastelloyC-276 thin-wall spinning shielding sleeve. The method comprises the following steps that (1) a HastelloyC-276 thin-wall shielding sleeve blank is subjected to spinning, and process parameters of spinning forming are as follows: feed ratio is 0.4-1.6 mm / r, thinning rate is 35-55%, and rotating speed of a mandrel is 80-100 r / min; (2) the spinning shield sleeve is subjected to annealing heat treatment, wherein annealing temperature is 650-750 DEG C, and the holding time is 10-150 min; and (3) after the annealing heat treatment is finished, the shielding sleeve is cooled to room temperature. According to the method provided by the invention, the residual stress of the HastelloyC-276 thin-wall spinning shielding sleeve can be reduced through the annealing heat treatment, and an effective technical way is provided for manufacturing the high-performance HastelloyC-276 thin-wall spinning shielding sleeve.

Description

technical field [0001] The invention belongs to the technical field of spinning, and relates to an annealing heat treatment method for reducing the residual stress of a Hastelloy C-276 thin-walled spinning shielding sleeve. Background technique [0002] Hastelloy C-276 alloy has excellent corrosion resistance and is widely used in harsh corrosive environments, especially in nuclear main pump stator / rotor shielding sleeves. [0003] High dimensional accuracy and good fatigue resistance and corrosion resistance are important goals for the manufacture of nuclear main pump shielding sleeves. Spinning forming is a new method for manufacturing high-precision Hastelloy C-276 thin-walled nuclear main pump shielding sleeves. During the spinning forming process, the blank and the mandrel rotate synchronously, and the spinning wheel is fed along the direction of the blank's generatrix, causing the metal material to undergo plastic deformation and flow, thereby completing the forming of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/10C21D9/00B21D22/14
CPCB21D22/14C21D9/0068C22F1/10Y02P10/20
Inventor 蔺永诚钱树生陈小敏李新和姜玉强
Owner CENT SOUTH UNIV
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