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Method for evaluating recrystallization tendency of single-crystal superalloy

A technology of superalloys and evaluation methods, applied in the field of superalloys, which can solve the problems of large differences in size and size, inability to reflect influence, and inability to use quantitative standards for recrystallization tendency.

Active Publication Date: 2018-06-01
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, people usually judge the recrystallization tendency of single crystal superalloys by indentation method, sand blowing, bumping and computer simulation. However, these methods have certain limitations, and are far from the actual production situation. It cannot reflect the influence of actual single crystal casting structural factors on recrystallization
At the same time, the actual single crystal castings have complex structures and large size differences, so it is impossible to use quantitative standards to evaluate the recrystallization tendency. Therefore, it is necessary to develop a method for judging the recrystallization tendency of single crystal castings

Method used

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  • Method for evaluating recrystallization tendency of single-crystal superalloy
  • Method for evaluating recrystallization tendency of single-crystal superalloy
  • Method for evaluating recrystallization tendency of single-crystal superalloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] First prepare the eccentric tubular sample of PWA1483 single crystal material, the height of the tubular sample is 300 mm, the outer diameter is 20 mm, the thickness of the thin wall is D1: the thickness of the thick wall is D2 = 1:20; the wax mold of the tubular sample is formed The pressure is 0.3MPa, the wax temperature is 68°C, and the holding time is 10 seconds; the mold shell of the tubular sample is prepared by alumina coating and alumina shell material; the pouring temperature for preparing the single crystal eccentric tubular sample is 1550°C , The solidification pulling speed is 3mm / min; after the tubular sample is prepared, the standard heat treatment is carried out, and then the macroscopic corrosion is carried out, and no recrystallization is observed at the thin wall.

Embodiment 2

[0023] First prepare the eccentric tubular sample of PWA1484 single crystal material, the height of the tubular sample is 300 mm, the outer diameter is 20 mm, the thickness of the thin wall is D1: the thickness of the thick wall is D2 = 1:20; the wax mold of the tubular sample is formed The pressure is 0.3MPa, the wax temperature is 68°C, and the holding time is 10 seconds; the mold shell of the tubular sample is prepared by alumina coating and alumina shell material; the pouring temperature for preparing the single crystal eccentric tubular sample is 1550°C , the solidification pulling speed is 3mm / min; after the tubular sample is prepared, the standard heat treatment is carried out, and then the macroscopic corrosion is carried out, and recrystallization is observed at the thin wall. By calculation, the ratio of the area of ​​recrystallized grains in the cross-section of the sample to the area of ​​the cross-section of the tubular sample is 1.5%.

Embodiment 3

[0025] First prepare the eccentric tubular sample of CMSX-4 alloy single crystal material, the height of the tubular sample is 100 mm, the outer diameter is 10 mm, the thickness of thin wall D1: the thickness of thick wall D2 = 1:15; the tubular sample The wax mold molding pressure is 0.2MPa, the wax temperature is 69°C, and the holding time is 60 seconds; the mold shell of the tubular sample is prepared by alumina coating and alumina shell material; the pouring temperature for preparing the single crystal tubular sample is 1480°C, the solidification rate is 9mm / min; after the tubular sample is prepared, the standard heat treatment is carried out, and then the macroscopic corrosion is carried out, and no recrystallization is observed.

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Abstract

The invention aims to provide a process method for judging recrystallization tendency of a cast single-crystal superalloy to meet the actual single-crystal casting production requirement. The specificscheme is as follows: an eccentric tubular sample produces different casting stress in different wall thickness positions in a directional solidification process, as a result, the deformation degreesin the positions are different, the recrystallization degrees of the eccentric tubular sample are different accordingly during standard heat treatment, and the ratio of the area of recrystallized grains at the cross section thin wall of the tubular sample to the area of the cross section of the tubular sample is calculated to be used as the index for evaluating the recrystallization tendency of the single-crystal superalloy.

Description

technical field [0001] The invention belongs to the technical field of superalloys, and in particular provides an evaluation method for recrystallization tendency of single crystal superalloys. Background technique [0002] With the rapid development of science and technology and the continuous improvement of demand, people's requirements for aero-engine turbine blades are becoming more and more stringent. At present, the most advanced aviation turbine blades used in the world are nickel-based superalloy single crystal blades. The single crystal directional solidification technology eliminates the lateral grain boundaries generated during the crystallization process, thereby improving the unidirectional mechanical properties of the material. However, in the actual solidification process, the strain caused by the casting stress will lead to recrystallization in the subsequent heat treatment process and then generate transverse grain boundaries, thereby impairing its high-tem...

Claims

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Application Information

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IPC IPC(8): G01N25/14
CPCG01N25/147
Inventor 姜卫国肖久寒卢玉章楼琅洪张健
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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