Repairing method for turbine blade of gas turbine
A technology of turbine blade and repair method, which is applied in the directions of additive manufacturing and additive processing, can solve the problems of poor weldability of turbine blade materials and difficulty in repairing some positions, and achieves remarkable technical effect, small heat-affected zone, and economical efficiency. great value effect
Pending Publication Date: 2022-04-12
DONGFANG TURBINE CO LTD
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AI Technical Summary
Problems solved by technology
The invention applies laser selective melting technology to the field of turbine blade repair to solve the problems of poor weldability of turbine blade materials and difficult repair of some positions
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0037] The invention discloses a method for repairing turbine blades of a gas turbine, which adopts laser selective melting and local directional growth for repairing, precisely inspects and controls the geometric dimensions of the blades during the repairing process, and ensures that the dimensional accuracy of the repaired blades is within the design range.
[0038] In view of the lack of flesh, wear and cracking of turbine blades with serious damage and large areas, the quality of blade repair cannot be guaranteed by partial repair methods. It is necessary to completely remove a large area of the blade matrix, and then restore the blade matrix to its original state. .
[0039] The concrete steps of this method are:
[0040] Step 1: Carry out non-destructive testing on the in-service turbine blades made of equiaxed crystal Mar M247, and use visual inspection to detect damage defects such as wear, cracking, and lack of flesh at the tip of the blade;
[0041] Step 2: Calibr...
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Abstract
The invention discloses a method for repairing an isometric crystal Mar M247 gas turbine blade, which is characterized in that a selective laser melting local directional growth mode is adopted for repairing, IN625 is adopted as powder for repairing, the geometric dimension of the blade is precisely checked and controlled in the repairing process, and the dimensional precision of the repaired blade is ensured to be within a design range. The method is based on the key technical problem of directional growth repair of the blade top position of the turbine moving blade of the gas turbine, the advantages of high energy density, small heat affected zone and the like of the selective laser melting technology are fully utilized, and the problems that the damaged position of the turbine blade of the gas turbine is difficult to weld and the material weldability is poor are solved; a reliable turbine blade top damage directional growth repair technology path is provided, a blade repair size inspection method is formulated, and the economic value is huge.
Description
technical field [0001] The invention relates to a turbine blade of a gas turbine, in particular to a repair method for the damaged blade. Background technique [0002] Turbine blades are the core components of gas turbines, and their manufacture is difficult and costly. The turbine blades of gas turbines operate under harsh conditions, and structural damage such as wear and cracks will occur during long-term operation, resulting in changes in their structural dimensions and affecting the safety and efficiency of gas turbine operation. In particular, the operating conditions of the turbine moving blades are extremely harsh, and the blade tip is likely to be worn to varying degrees. When the wear defect is relatively large, it needs to be repaired or replaced with new parts, but the manufacturing cost of the turbine blade is high. If the direct Adopting the replacement method, neither the period nor the cost can meet the economic operation requirements of the unit. Therefore...
Claims
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IPC IPC(8): B22F10/28B22F7/08B33Y10/00
Inventor 熊建坤聂甫恒毛桂军杨建平杨林许德星赵鹏飞何芬郭洋王喆张红涛
Owner DONGFANG TURBINE CO LTD