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分析了激光熔覆过程中温度场的主要影响因素,在主要考虑边界条件和热源数据的基础上,建立了送粉式激光熔覆多道搭接情况下温度场的有限元计算模型,并对板材上搭接三道熔覆层的熔覆温度场进行了三维数值模拟,得到了每道熔覆层上中心点的温度变化规律.结果表明,在激光熔覆过程中每道熔覆层中心点上的温度随时间延长呈锯齿状变化,且每个中心点所能达到的最高温度并不相同.此外,搭接情况下,熔覆层中心点每次升温前的最低温度是随着熔覆顺序的进行而逐渐升高的,且升高趋势类似于抛物线.此计算结果合理,为研究应力场和应变场的变化规律打下基础. 相似文献
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Five kinds of Ni-based coatings with 0 wt%, 2.5 wt%, 5.0 wt%,7.5wt% and 10.0wt% molybdenum were prepared on 45CrNi steel plates by using laser cladding technique. The effect of Mo on the microstructure of Ni-based coatings was investigated by using scanning electron microscopy. The corrosive wear resistance and the corrosion resistance of five coatings were tested. The results show that the corrosive wear resistance of the coating with 5.0wt% Mo is better than those of other coatings. During the corrosive wear process, the corrosion and wear effects are combined. The corrosive wear resistance is closely related to the microstructure of the coating. 相似文献
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采用CO2激光器在45CrNi钢表面制备了5种不同钼含量的镍基合金激光熔覆层,借助球盘式摩擦磨损试验机对NiCrBSiMo激光熔覆层的腐蚀磨损性能进行了测试并对腐蚀磨损的交互作用进行了定量分析.结果表明,镍基合金中加入钼,可以提高熔覆层的腐蚀磨损性能.熔覆层因腐蚀磨损导致的材料失重主要归因于纯磨损和腐蚀磨损的交互作用.交互作用引起的失重约占总失重的24%~56%,纯腐蚀引起的失重可忽略不计.腐蚀磨损中的磨损失重是纯磨损失重的1.3~2.3倍,磨损增量超过交互作用总量的99%;腐蚀磨损中的腐蚀失重是静态腐蚀失重的1.4~2.7倍,但其量很小. 相似文献
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