A fatigue-resistant hot isostatic pressing repair evaluation model for cast superalloys based on ultrasonic fatigue
A high-temperature alloy and hot isostatic pressing technology, which is applied in the direction of analyzing solids using sound waves/ultrasonic waves/infrasonic waves, material analysis using sound waves/ultrasonic waves/infrasonic waves, and processing detection response signals. It can solve detection capacity limitations and negative effects , Incomplete safety evaluation theory and technology, etc., to achieve the effect of simple and fast calculation, clear thinking, and optimized hot isostatic pressing repair process
Active Publication Date: 2020-09-01
株洲市嘉泰动力技术服务有限公司
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Problems solved by technology
There are two problems in the hot isostatic pressing technology of material casting defects: one is that the size of casting defects can be reduced and it is difficult to repair them completely; the other is that the smaller the size of the casting defects after healing, the higher the hot isostatic pressing process parameters, Microstructure brings unavoidable negative effects
The ability to detect defects is limited by the level and ability of detection, especially the theory and technology of safety evaluation after detecting defects is not perfect,
Method used
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Embodiment 1
[0021] A process evaluation model for hot isostatic pressing of cast superalloys against fatigue, comprising the following steps:
[0022] (1) Take 1 to 3 identical cast superalloy specimens, marked as specimen 1, specimen 2, and specimen 3, and perform different hot isostatic pressing repair processes on specimens 1 to 3, and then repair the specimens Ultrasonic fatigue method is used for 1~3 to carry out ultra-high cycle fatigue test, and the test frequency is 20kHz; for samples 1~3, the shape and size of holes in the fatigue fracture source area are observed by scanning electron microscope, and the hot isostatic pressure of samples 1~3 is obtained. The maximum defect size a after repair max , respectively 15μm, 28μm, 45μm;
[0023] (2) Take the same cast superalloy as in step (1), mark it as specimen 0, conduct ultrasonic fatigue test on specimen 0, the test frequency is 20kHz, observe the fatigue fracture, and obtain the casting hole initiation threshold value ΔK th,ini ...
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Abstract
The invention discloses an anti-fatigue hot isostatic pressure repairing evaluation model for casting a high-temperature alloy based on ultrasonic fatigue The model is based on a fatigue crack growththeory, and obtains a fatigue small crack growth curve of the high-temperature alloy; and a fatigue threshold value induced by casting defect crack is used as a standard for evaluating a hot isostaticpressure repairing process. The model can obtain the size distribution of different defects of the casted high-temperature alloy repaired under different hot isostatic pressures, and evaluates the safety performance and rationality of the hot isostatic pressure repairing process by quickly estimating the material defect expansion resistance. The model avoids the empirical evaluation of the advantage and disadvantage of the process based on the size of the material defect, and provides a scientific basis for optimizing the hot isostatic pressure repairing process. The model has clear ideas, and simple and fast calculation.
Description
technical field [0001] The invention belongs to the field of casting superalloy defect repair, and relates to an evaluation model of casting superalloy anti-fatigue hot isostatic pressure repair based on ultrasonic fatigue. Background technique [0002] Cast superalloys have the advantages of creep resistance, high temperature resistance, and good forming, and are widely used in the fields of aero-engines and steam turbine blades. Engine blades are subjected to high-frequency vibration fatigue loads during high-speed operation, and fatigue cracks are prone to casting defects in cast high-temperature alloys. The size of casting defects seriously affects the high-cycle and ultra-high-cycle fatigue properties of materials. Repairing casting defects of cast superalloys by hot isostatic pressing technology is the key to improving the fatigue resistance of superalloys. There are two problems in the hot isostatic pressing technology of material casting defects: one is that the siz...
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IPC IPC(8): G01N29/44G01N29/04
CPCG01N29/04G01N29/4445G01N2291/0234G01N2291/0289
Inventor 聂宝华陈奥宙左智涵陈东初赵子华张峥孙海波
Owner 株洲市嘉泰动力技术服务有限公司