Steel blade residual stress micro-magnetic nondestructive testing method and steel blade residual stress micro-magnetic nondestructive testing device based on incremental permeability

Abstract

A steel blade residual stress micro-magnetic nondestructive testing method and a steel blade residual stress micro-magnetic nondestructive testing device based on incremental permeability belong to the technical field of steel blade residual stress nondestructive testing. An automatic manipulator clamps a micro-magnetic probe to scan a steel blade to detect micro-magnetic signals, then, incremental permeability is extracted to represent residual stress, and finally, the residual stress distribution of the whole blade is acquired. The testing device mainly comprises a manipulator, a micro-magnetic probe, a system control and micro-magnetic signal collecting and processing module, and the like. The testing device can work in two modes: a blade motion testing mode and a probe motion scanning mode. In the blade motion testing mode, the micro-magnetic probe is fixedly mounted on the base of a workbench, a pincer-like clamp is mounted at the end of the manipulator, a blade is clamped to move along a preset curved surface relative to the micro-magnetic probe, and thus double sides of the blade are tested. In the probe motion scanning mode, a steel blade is fixedly mounted on an open ring clamp, the end of the manipulator clamps the micro-magnetic probe to scan the surface of the steel blade, and the blade can be turned to complete double-side testing by rotating a driving mechanism.

Description

Technical field: [0001] The invention relates to a technology for non-destructive detection of residual stress on the surface of steel blades, in particular to a method and device for micro-magnetic non-destructive detection of residual stress of steel blades based on incremental magnetic permeability. Background technique: [0002] In industrial applications of steam turbines, the working environment of the final blades is extremely harsh. Water erosion, stress corrosion, and fatigue often cause damage and failure of blades. Blade breakage often leads to serious safety accidents for the entire unit. Two technological measures are often used to improve the water erosion resistance of the blade. The first is to perform local high-frequency quenching and strengthening on the steam inlet side of the blade. After local high-frequency quenching, although the anti-corrosion ability of the blade is improved, high-frequency quenching will change the tissue stress. The residual st...

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And the measurement method is complicated, the operation is cumberso

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