3D analysis of thermal and stress evolution during laser cladding of bioactive glass coatings
3D analysis of thermal and stress evolution during laser cladding of bioactive glass coatings
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DOI：
10.1016/j.jmbbm.2016.02.023
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发表时间：
2016-06-01
影响因子：
3.9
通讯作者：
Glendenning, Malcolm
中科院分区：
文献类型：
--
作者：
Krzyzanowski, Michal;Bajda, Szymon;Glendenning, Malcolm
对Ti6A14V合金基板生物活性玻璃涂层激光熔覆过程中的热场和应变-应力瞬态场进行了数值计算和分析。利用基于有限元的模型，结合试样微观形貌的实验结果，研究了导致涂层微裂纹敏感性的条件。由于激光束沿着复杂的轨迹运动，在包覆材料内部产生连续的温度和应力峰值，从而导致微裂纹。将基板预热到500℃，可以降低激光功率，降低连续温度峰之间的冷却速度，从而实现较低的开裂敏感性。第二层和第三层包覆期间的冷却速度低于第一层包覆期间的冷却速度，因此，由于在此过程中热量的逐步积累，有助于提高后续层的抗裂性。(C) 2016 Elsevier Ltd.版权所有。
Thermal and strain-stress transient fields during laser cladding of bioactive glass coatings on the Ti6A14V alloy basement were numerically calculated and analysed. Conditions leading to micro-cracking susceptibility of the coating have been investigated using the finite element based modelling supported by experimental results of microscopic investigation of the sample coatings. Consecutive temperature and stress peaks are developed within the cladded material as a result of the laser beam moving along the complex trajectory, which can lead to micro-cracking. The preheated to 500 degrees C base plate allowed for decrease of the laser power and lowering of the cooling speed between the consecutive temperature peaks contributing in such way to achievement of lower cracking susceptibility. The cooling rate during cladding of the second and the third layer was lower than during cladding of the first one, in such way, contributing towards improvement of cracking resistance of the subsequent layers due to progressive accumulation of heat over the process. (C) 2016 Elsevier Ltd. All rights reserved.