激光微造型球墨鑄鐵表面干摩擦性能研究
[Abstract]:Based on the mechanical effect of laser shot peening, micro-molding arrays with certain morphologic parameters can improve the friction and wear properties of the materials, so they have been widely studied and applied in the field of friction and wear. In this paper, the nodular cast iron was used as the research object, and the micro-molding array with certain geometric parameters and morphologies was prepared on the surface of the sample by laser shot peening technology, and the corresponding mechanical properties of the micro-moulded sample surface were tested. Finally, through dry friction and wear test and numerical simulation of reciprocating sliding wear process, the influence mechanism of geometric parameters and morphology of micro-molding on friction and wear resistance of nodular cast iron surface is analyzed synthetically. The main works are as follows: (1) based on the theory of laser shot peening, the influence mechanism of laser shot peening on the microstructure and mechanical properties of nodular cast iron surface is discussed. By adjusting the laser energy during shot peening and controlling the moving speed of the platform, the microcrater array with different aspect ratio and center distance is fabricated. The relationship between laser shot peening energy and microhardness and residual stress of micro-moulding surface is obtained. (2) through dry friction and wear test, different parameters of micro-molding (ratio of depth to diameter) are analyzed. The effect of pit center distance on the surface friction and wear characteristics of ductile iron samples was studied. It was found that the surface of micro shaped specimens with the ratio of depth to diameter of micropits 0.052 and center distance of 2 mm had the best dry friction and wear properties. Finally, according to the dry friction and wear theory and wear trace morphology observation, The mechanism of friction reduction and wear resistance on the surface of micro-molding sample is further analyzed. (3) the numerical simulation of equivalent stress distribution and temperature distribution of unmolded and micro-molded contact surfaces during reciprocating sliding wear is analyzed. The results show that the stress concentration area of the contact surface of the unmolded model is significantly larger than that of the contact surface of the micro-modeling model, and the average equal-effect force value of the contact surface of the micro-modeling model is obviously lower than that of the unmolded surface, and the degree of stress concentration is obviously improved. The maximum temperature rise in the contact area of the unmolded model is higher than that of the micro-modeling surface, and the temperature rise area of the contact surface is larger in the sliding wear process of the unmolded model, and the temperature of the contact surface of the micro-modeling model is generally lower than that of the unmolded contact surface. And there will be no large area of temperature rise, surface temperature distribution can be improved.
【學(xué)位授予單位】:江蘇大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TG143.5;TG668
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