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Longitudinal-transverse type core wound rail sampling and fracture analysis method

An analysis method, a vertical and horizontal technology, applied in the field of sampling and fracture analysis of vertical and horizontal nuclear damage rails, can solve the problems of no relevant literature on the sampling method and fracture analysis method of vertical and horizontal nuclear damage rails, and achieve the effect of simple operation

Active Publication Date: 2013-08-07
INNER MONGOLIA BAOTOU STEEL UNION
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no relevant literature on the sampling method and fracture analysis method of vertical and horizontal nuclear damage rails.

Method used

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  • Longitudinal-transverse type core wound rail sampling and fracture analysis method
  • Longitudinal-transverse type core wound rail sampling and fracture analysis method
  • Longitudinal-transverse type core wound rail sampling and fracture analysis method

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] The steps of the method of the present invention are as follows:

[0028] Step S1: Detect the position of the transverse fatigue crack inside the rail head of the vertical and horizontal nuclear damage rail.

[0029] Use the ultrasonic flaw detection method to determine the position of the transverse fatigue crack inside the rail head of the nuclear damaged rail, and record the position.

[0030] Step S2: Press open the transverse fatigue cracks inside the rail head to expose the transverse fatigue fracture of nuclear damage, observe the macroscopic morphology of the transverse fatigue fracture and determine the type of nuclear damage.

[0031] Press open the transverse fatigue cracks inside the rail head by machining to expose the nuclear transverse fatigue fracture, observe the fatigue source of the transverse fatigue fracture (that is, the minimum radius of the fatigue arc) and the dispersion direction of the radial stripes perpendicular to the fatigue arc. Such as ...

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Abstract

The present invention discloses a longitudinal-transverse type core wound rail sampling and fracture analysis method, which comprises: detecting a position of a transverse fatigue crack inside a rail head of a longitudinal-transverse type core wound rail; pressing the transverse fatigue crack to expose a core wound transverse fatigue fracture, observing a macroscopic morphology of the transverse fatigue fracture, and determining a core wound type; cutting the core wound rail from the transverse fatigue fracture surface along a longitudinal surface to obtain a preliminary sample; unclosing a longitudinal fatigue crack of the preliminary sample to obtain a two coupling longitudinal fatigue fracture sample, and observing a position and a size of a fatigue source of the longitudinal fatigue fracture; washing the two coupling longitudinal fatigue fracture sample, and adopting a scanning electron microscopy to observe a microscopic morphology of a fatigue source of the longitudinal fatigue fracture; and adopting a micro-zone energy spectrometer to obtain chemical components of the fatigue source of the longitudinal fatigue fracture and determine types and sources of foreign substances. The longitudinal-transverse type core wound rail sampling and fracture analysis method has a characteristic of simple operation.

Description

technical field [0001] The invention relates to the field of metal failure analysis, in particular to a sampling and fracture analysis method for vertical and horizontal nuclear damage rails Background technique [0002] When the train passes the rail, contact shear stress is distributed under the rail head tread due to the wheel-rail contact. The distribution and size of the shear stress are related to the speed of the train, the axle load of the train, the contact position and contact area of ​​the wheel and rail. Theoretical research shows that the wheel-rail contact shear stress within a certain depth range (5-12mm) under the tread is relatively large. Under the action of wheel-rail contact stress and dynamic bending stress during passing, fatigue cracks are easy to initiate at the inclusions and expand longitudinally along the rail. After a certain period of time, they turn to the rail head under the action of wheel-rail dynamic bending stress The tread and the rail w...

Claims

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Application Information

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IPC IPC(8): G01N33/20G01N1/04
Inventor 冯岩青高明星
Owner INNER MONGOLIA BAOTOU STEEL UNION
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