激光技术, 2010, 34 (3): 326, 网络出版: 2010-08-31
激光熔覆H13-TiC梯度复合涂层的制备与组织性能
Manufacture and microstructure performance of H13-TiC gradient composite coating made by laser cladding
激光技术 激光熔覆 梯度复合涂层 热稳定性 laser technique laser cladding gradient composite coating H13-TiC H13-TiC thermal stability
摘要
为了解决高温下热应力导致的常规涂层脱落与开裂,在H13钢表面激光熔覆制备了H13-TiC梯度复合涂层,采用扫描电镜、X射线衍射、电子探针能谱等技术对梯度涂层的组织形貌、成分分布、硬度和热稳定性进行了分析。结果表明,涂层主要由Fe-Cr,TiC,TiO2和Fe7C3等物相组成,其中TiC呈现近多面体、枝晶态等外形;随着TiC含量的增加,TiC颗粒的尺寸变大,梯度涂层的硬度逐渐提高,结合区的枝晶组织逐渐变小,呈现明显的梯度分布;600℃高温加热空冷处理后,各层间重熔软化区硬度下降幅度最大,其次为基体H13钢,整体上硬度仍呈梯度分布。可以看出,激光熔覆H13-TiC梯度复合涂层有着极大的应用潜力。
Abstract
In order to solve the coating’s general peeling and cracking problems caused by thermal stress at high temperature, H13-TiC gradient composite coatings were made by laser cladding on the surface of H13 hot-work die steel substrates. Using scanning electron microscope, X-ray diffraction and energy dispersive spectrometry, the microstructure and morphology, distribution of constituents, hardness and thermal stability were checked. The results show that the coating mainly consists of Fe-Cr, TiC, TiO2 and Fe7C3. Polyhedron and dendritic TiC particles were dispersed in the coating. With the rising of TiC, TiC particles become larger, the hardness of the gradient coating is gradually improved, the dendritic structure in the bonding zone become smaller, and their distribution is in gradient. After heating at high temperature of 600℃ and cooling in the air, the decrease of the hardness is the largest in remelting region among the layers, while the substrate H13 steel is in the second place. On the whole, the hardness distribution of the coating is still in gradient. H13-TiC gradient composite coatings made by laser cladding have a great potential for applications.
汤晓丹, 姚建华, 孔凡志, 张群莉. 激光熔覆H13-TiC梯度复合涂层的制备与组织性能[J]. 激光技术, 2010, 34(3): 326. TANG Xiao-dan, YAO Jian-hua, KONG Fan-zhi, ZHANG Qun-li. Manufacture and microstructure performance of H13-TiC gradient composite coating made by laser cladding[J]. Laser Technology, 2010, 34(3): 326.