等離子噴焊表面質(zhì)量的金屬磁記憶檢測
[Abstract]:Plasma spray welding is a typical surface repair technology, which has been widely used because of its advantages of concentrated energy, high efficiency, good process stability and easy to realize automation. In the process of spray welding, the center temperature of plasma arc can reach more than 15000 K, which makes the substrate produce great thermal damage, and during the service of the cladding layer, it often bears the function of tensile fatigue load, and the stress is concentrated. Fatigue has become one of the main forms of cladding damage. Nondestructive detection of these damage has become a key link in surface repair of remanufactured components. Metal magnetic memory detection is a new nondestructive testing method. It is of great significance and application value to study the thermal damage, cladding stress and fatigue of the substrate, to promote the development of the technology in surface engineering. In this paper, the effect of thermal stress on surface magnetic memory signal in plasma spray welding is studied. The plasma spray welding cladding layer was prepared to detect the magnetic memory signal on the detection line at different distances from the cladding layer before and after spray welding. The variation of the magnetic signal peak and valley difference (Hp (p) with the thermal stress was analyzed. Combined with the change of microstructure and the half-width of X-ray diffraction peak in the heat-affected zone, the magnetic memory measurement method of thermal stress in plasma spray welding is discussed. Secondly, the standard plasma spray welding coating static load tensile specimen was prepared, and the surface magnetic signal of the cladding layer under different tensile stress was detected by TSC-2M-4 magnetic memory detector. The quantization relationship between magnetic signal normal component gradient K and tangential component mean Hp (x) avg and tensile stress is analyzed, and further based on magnetic domain change and magneto-mechanical effect, The magnetic memory technique for quantitative evaluation of static load tensile stress of plasma spray welding cladding is discussed. Finally, the magnetic memory signals, plastic deformation and microstructure of the cladding layer were observed at different cycles and before and after fracture for the standard plasma spray welding cladding fatigue specimen. The relationship between the maximum gradient Kmax of Hp (y) and the peak Hp (x) avg of Hp (x) with the increase of cycle cycles is analyzed. The damage parameter Dof the cladding layer based on Kmax is proposed and the magnetic memory method for detecting the tensile fatigue damage of the cladding layer by plasma spray welding is discussed.
【學(xué)位授予單位】:合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2016
【分類號(hào)】:TG441.7
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