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A method for evaluating the surface of high-strength steel subjected to ultra-high cycle fatigue machining

A high-strength steel, machining technology, applied in the field of machining, to avoid time-consuming effect

Active Publication Date: 2021-03-26
FOSHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The current research mainly focuses on the influence of surface processing defects on the ultra-high cycle fatigue performance and behavior of high-strength steel, and does not involve the evaluation of the integrity of the machined surface of high-strength steel against ultra-high cycle fatigue with base defects and residual stress

Method used

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  • A method for evaluating the surface of high-strength steel subjected to ultra-high cycle fatigue machining
  • A method for evaluating the surface of high-strength steel subjected to ultra-high cycle fatigue machining
  • A method for evaluating the surface of high-strength steel subjected to ultra-high cycle fatigue machining

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Embodiment 1

[0019] A method for evaluating the integrity of high-strength steel anti-ultra-high cycle fatigue machining, comprising the following steps:

[0020] (1) Use a roughness measuring instrument to measure the groove shape of high-strength steel machining, a=3.4μm, 2b=68μm, since a / 2b=0.05<0.195, so according to the formula ①

[0021]

[0022] Calculate the equivalent surface defect size A sur =88.7μm 2

[0023] (2) Measure the residual compressive stress σ on the machined surface of high-strength steel by X-ray instrument r =-200MPa

[0024] (3) Using the metallographic profile polishing method, the metallographic phase of high-strength and high-steel is polished layer by layer, the internal inclusion size of the material is observed, and the maximum inclusion size A of the material is counted inc =625μm 2

[0025] (4) adopt material durometer, measure the Vickers hardness Hv=533 of material;

[0026] (5) According to formula ③, estimate the ultra-high cycle fatigue lim...

Embodiment 2

[0031] A method for evaluating the integrity of high-strength steel anti-ultra-high cycle fatigue machining, comprising the following steps:

[0032] (1) Use a roughness measuring instrument to measure the groove shape of high-strength steel machining, a=5.4, 2b=68μm, because a / 2b=0.079<0.195, so according to the formula ①

[0033]

[0034] Calculate the equivalent surface defect size A sur =200μm 2

[0035] (2) Measure the residual tensile stress σ on the machined surface of high-strength steel by X-ray instrument r =345MPa

[0036] (3) Using the metallographic profile polishing method, the metallographic phase of high-strength and high-steel is polished layer by layer, the internal inclusion size of the material is observed, and the maximum inclusion size A of the material is counted inc =625μm 2

[0037] (4) adopt material durometer, measure the Vickers hardness Hv=533 of material;

[0038] (5) According to formula ③, estimate the ultra-high cycle fatigue limit σ ...

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Abstract

The invention discloses a high-strength steel ultra-high cycle fatigue resistance machining surface integrity evaluation method which includes the steps: measuring a machining groove shape and residual stress of the surface of a material by the aid of a roughness measuring instrument and an X-ray; polishing the machining groove layer to layer by the aid of a metallographic profile technology to obtain the inner inclusion sizes of the high-strength steel; introducing machining surface defect sizes and residual stress parameters based on fatigue and fracture theories of a high-strength material,building a machining surface integrity evaluation equation of the anti-ultra-high cycle fatigue, and quantitatively evaluating acceptability of different machining methods of the high-strength steel.By the aid of simple testing technology and method such as roughness measuring instrument, a residual stress tester, a metallographic profile method, micro-hardness testing method, machining integrity evaluation of the anti-ultra-high cycle fatigue of the high-strength steel can be completed according to the machining integrity evaluation method of the anti-ultra-high cycle fatigue of the high-strength steel, a time-consuming and expensive ultra-high cycle fatigue test is avoided, and the method has the advantages of simplicity, rapidness and economical property.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, in particular to a method for evaluating the surface of high-strength steel anti-ultra-high cycle fatigue mechanical processing. Background technique [0002] High-strength steel has the advantages of high strength, toughness and good formability. It is widely used in aerospace, high-speed rail, automobile and other fields. It is usually used as steam turbine blades, automobile springs, high-precision bearings, high-speed rail bogies and other components. When these components are in service with a long service life, they are subjected to high-frequency vibration fatigue loads, and the cycle load can reach 109 cycles, that is, ultra-high cycle fatigue. For high-strength materials, ultra-high cycle fatigue cracks often originate from microscopic defects of materials, such as surface processing defects, inclusions, casting holes, etc. of high-strength materials, and are especially sen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/20G01D21/02
CPCG01D21/02G01N33/20
Inventor 聂宝华陈东初吕锦源赵子华孙海波赖炳南
Owner FOSHAN UNIVERSITY