Method for predicting forge crack initiation of forged steel
A crack and forging technology, which is applied in the direction of testing metals and material inspection products, can solve the problems of not predicting the formation of forging cracks, economic losses of factories and enterprises, and poor operability, so as to achieve good operability and large Economic benefits, the effect of avoiding cracks
Inactive Publication Date: 2015-02-04
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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[0002] At present, there are two ways to solve forging cracks at home and abroad: one is to find the cause of the cracks after the forging process produces cracks in production, and to solve the specific reasons instead of predicting the forging cracks before they are formed. , which brings great economic losses to factories and enterprises; the other is theoretical research, which is to establish a fracture criterion, obtain a fracture damage factor based on the fracture criterion, and use the damage factor to predict the occurrence of cracks, but this method The operability is poor in actual production, and it cannot be applied in the actual forging process
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[0017] Taking the upsetting of 316LN austenitic stainless steel flat anvil as an example, the deformation conditions are: temperature: 900°C-1250°C, strain rate: 0.005s -1 -1s -1 , obtain its critical deformation surface according to the implementation steps of the method of the present invention, such as figure 2 shown.
[0018] When formulating the upsetting process of 316LN steel flat anvil, firstly, according to the combination of temperature and strain rate, the corresponding figure 2 , to determine the critical deformation under this condition, the deformation during actual upsetting should be less than the critical deformation. For example: to determine the temperature of 1200 ° C, the strain rate of 0.005s -1 The critical deformation of upsetting under the condition of figure 2 It can be seen that the critical deformation value under this condition is 0.58, so the upsetting deformation under this condition should be less than 58%. If it is greater than 58%, crac...
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The invention discloses a method for predicting forge crack initiation of forged steel and belongs to the technical field of forging processes. The method is characterized by comprising the steps of: carrying out a high-temperature tension test at different temperatures and strain rates to obtain a material flow stress curve line, crack initiation strain and corresponding diameter value; simulating a high-temperature tension process at different temperatures and strain rates by utilizing finite element software to obtain a critical damage value of crack initiation; based on the critical damage value, simulating a basic forging process by utilizing finite elements to obtain critical forging deformation amount; and drawing a critical deformation curve for critical deformation data subjected to verification of a forging shrink ratio experiment. All points below the curve are non crack initiation points, all points above the curve are crack initiation points, and all points on the curve are critical points. The method has the advantages that the deformation amount of forge pieces without cracks in the forging process can be determined by the simple and convenient method.
Description
technical field [0001] The invention belongs to the technical field of forging technology, and in particular relates to a method for predicting forging crack initiation of forged steel. Background technique [0002] At present, there are two ways to solve forging cracks at home and abroad: one is to find the cause of the cracks after the forging process produces cracks in production, and to solve the specific reasons instead of predicting the forging cracks before they are formed. , which brings great economic losses to factories and enterprises; the other is theoretical research, which is to establish a fracture criterion, obtain a fracture damage factor based on the fracture criterion, and use the damage factor to predict the occurrence of cracks, but this method It has poor operability in actual production and cannot be applied in actual forging process. Contents of the invention [0003] The purpose of the present invention is to provide a method for predicting the in...
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IPC IPC(8): G01N33/20
Inventor 段兴旺刘建生郑晓华田继红赵晓东张秀芝
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY