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Method for estimating the depth of a metal additive manufacturing ultrasonic impact treatment action layer

An ultrasonic impact and metal additive technology, which is applied in the field of estimating the depth of the action layer of metal additive manufacturing by ultrasonic impact treatment, and the depth of the action layer of ultrasonic impact treatment, can solve the problems of inconvenient use process, high testing cost, and cumbersome sample preparation. , to achieve the effect of good accuracy

Active Publication Date: 2019-03-19
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is easier to operate than the metallographic observation method and is more accurate in measuring the depth range of the deformed layer; the EBSD method can judge whether the material has plastic deformation by measuring the dislocation density. Expensive and inconvenient to use

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  • Method for estimating the depth of a metal additive manufacturing ultrasonic impact treatment action layer
  • Method for estimating the depth of a metal additive manufacturing ultrasonic impact treatment action layer
  • Method for estimating the depth of a metal additive manufacturing ultrasonic impact treatment action layer

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specific Embodiment 1

[0080] A 316L stainless steel sample (LMD-deposited 316LSS) was prepared by laser metal deposition (LMD), and the subsequent ultrasonic impact treatment (UIT) experiment was used to verify the correctness of the plastic zone depth calculation model. Ultrasonic impact test parameters are: ultrasonic frequency 20kHz, horn amplitude 80μm, impact needle radius 2.6mm. The impact needle uses high-strength steel, and its density and elastic modulus are 7.85g / cm 3 and 205GPa. From formula (15a), in order to calculate the depth of the action layer, the parameters of the material to be impacted are density, elastic modulus, Poisson's ratio and yield strength of the material under high strain rate conditions. The density of LMD-deposited 316L SS measured by drainage method is 7.75g / cm 3 . The elastic modulus and Poisson's ratio can be measured by ultrasonic method, and their values ​​are 200GPa and 0.3 respectively. Considering that the microstructure and properties of LMD forming ma...

specific Embodiment 2

[0090] 304 stainless steel was prepared by laser metal deposition technology, followed by ultrasonic impact treatment (UIT) experiments. The ultrasonic frequency is 20kHz, the amplitude of the horn is 80μm, and the radius of the impact needle is 2.6mm. The impact needle uses high-strength steel, and its density and elastic modulus are 7.85g / cm 3 and 205GPa. Laser deposition 304 stainless steel material parameters are: density 7.80g / cm 3 , the elastic modulus and Poisson's ratio are 201GPa and 0.3 respectively, and the dynamic constitutive relation is:

[0091]

[0092] Therefore, the compressive yield strength in the UIT process is 300MPa. Substituting the above experimental parameters and material parameters into the calculation model of the depth of the action zone (Equation 15a), the depth of the action layer can be obtained: r max = 1.41 mm. The microhardness distribution test is also used, and the actual depth of the active zone is measured to be 1.60mm. The resu...

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Abstract

The invention provides a method for estimating the depth of a metal additive manufacturing ultrasonic impact treatment action layer, wherein the action layer depth calculation model is shown in the specification; wherein rmax is the depth of an action layer, Upsilon is the Poisson ratio of an additive manufacturing metal part, Rho is the density, E is elasticity modulus, f is the frequency of theultrasonic transducer, A is the amplitude of the amplitude-change pole, r0 is the radius of the impact needle; pin is the impact needle, AM is the impacted material, and sigma p0.2 is the compressiveyield strength of the impacted material under the condition of high strain rate. The estimation method disclosed by the invention can be used for predicting the depth of the action layer under specific'additive 'and'forging' forming parameters; the method is used for guiding formulation of an ultrasonic-assisted additive manufacturing composite manufacturing forming process. Accurate control overthe structure and the internal stress of the additive manufacturing metal part is achieved, the problems of shape control and controllability of a formed metal component in the existing additive manufacturing technology are solved, and the high-performance metal part which is comparable to the performance of a forge piece is obtained.

Description

technical field [0001] The invention relates to a method for ultrasonic impact treatment of the depth of an action layer, in particular to a method for estimating the depth of an action layer for ultrasonic impact treatment in metal additive manufacturing, and belongs to the fields of additive manufacturing and ultrasonic impact treatment. Background technique [0002] As an advanced manufacturing technology, additive manufacturing (Additive manufacturing, AM) technology has been widely used. However, there are some inherent characteristics in the deposited structure of metal parts formed by additive manufacturing. Taking laser metal deposition (LMD) technology as an example, since the forming process uses a high-energy-density laser beam to form a small molten pool, it is difficult to feed into the molten metal. The powder in the pool is completely melted, and the cooling process experiences a high temperature gradient, an extremely fast cooling rate, and a large growth rat...

Claims

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Application Information

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IPC IPC(8): G06F17/50B22F3/105B33Y50/02
CPCB33Y50/02G06F2111/10G06F2119/06G06F30/20B22F10/00B22F10/25Y02P10/25
Inventor 姜风春周长平王建东袁丁冯帅李响孙徕博苏艳果春焕王振强
Owner HARBIN ENG UNIV
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