王冉,王玉玲,姜芙林,杨发展.基体预热对激光熔覆制备Al2O3-ZrO2陶瓷涂层裂纹敏感性的影响[J].表面技术,2022,51(3):342-352. WANG Ran,WANG Yu-ling,JIANG Fu-lin,YANG Fa-zhan.Effect of Substrate Preheating on Crack Sensitivity of Al2O3-ZrO2 Ceramic Coating Prepared by Laser Cladding[J].Surface Technology,2022,51(3):342-352 |
基体预热对激光熔覆制备Al2O3-ZrO2陶瓷涂层裂纹敏感性的影响 |
Effect of Substrate Preheating on Crack Sensitivity of Al2O3-ZrO2 Ceramic Coating Prepared by Laser Cladding |
投稿时间:2021-03-30 修订日期:2021-09-01 |
DOI:10.16490/j.cnki.issn.1001-3660.2022.03.037 |
中文关键词: 激光熔覆 裂纹控制 数值模拟 陶瓷涂层 基体预热 热力耦合 |
英文关键词:laser cladding crack control numerical simulation ceramic coating substrate preheating thermal coupling |
基金项目:山东省自然科学基金(ZR2018PEE011,ZR2019MEE059);山东省重点研发计划(2019GNC106102,2018GSF117038);青岛西海岸新区创新重大专项(2016-2,2018-1-5) |
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中文摘要: |
目的 为了解决钛合金表面制备Al2O3-ZrO2陶瓷涂层存在的陶瓷涂层脆性大、易开裂等问题,有效增强钛合金耐高温、耐磨损性能,扩大其在高温、重载等严苛条件下的使用范围,方法 通过基体预热方式对在钛合金表面制备的Al2O3-ZrO2陶瓷熔覆层的裂纹敏感性进行改善,通过进行熔覆试验和对熔覆层微观组织形貌分析、性能测试分别评价不同预热温度对熔覆层裂纹敏感性的影响,还进一步通过有限元分析软件建立热力耦合模型,从理论的角度探究基体预热影响熔覆层裂纹敏感性的作用机理。结果 实验发现经基体预热,熔覆层裂纹数量明显减少,测得基体预热200 ℃时,熔覆层断裂韧性得到明显提高,从4.7 MPa.m½提高至8.1 MPa.m½,熔覆层显微组织发生了由等轴晶、柱状晶向条状枝晶、胞状晶的转变。根据不同预热温度下的热力耦合结果发现,随着预热温度的升高,熔覆层中的残余应力明显减小,降低了熔覆层内部的应力集中,从而抑制了熔覆层的开裂行为。结论 采取基体预热的方式可明显降低熔覆层内的残余应力,改善熔覆层裂纹的敏感性,增强熔覆层的韧性,预热200~300 ℃时对熔覆层性能的改善效果最为明显,可以为实际生产制造陶瓷涂层过程中抑制裂纹发生提供切实可行的参考依据。 |
英文摘要: |
The work aims to solve the problems of large brittleness and easy cracking of Al2O3-ZrO2 ceramic coating prepared on the surface of titanium alloy, effectively enhance the high temperature and wear resistance of titanium alloy, and expand the application range of titanium alloy under severe conditions such as high temperature and heavy load. The crack sensitivity of Al2O3-ZrO2 ceramic coating prepared on the surface of titanium alloy was improved by substrate preheating, Through the cladding test, microstructure analysis and performance test on the cladding layer, the effects of different preheating temperature on the crack sensitivity of the cladding layer were evaluated respectively. Further, the thermal mechanical coupling model was established through the finite element analysis software to explore the mechanism of the effect of substrate preheating on the crack sensitivity of the cladding layer. The number of cracks in the cladding layer was significantly reduced after the substrate was preheated. When the substrate was preheated at 200 ℃, the fracture toughness of the cladding layer was significantly improved, from 4.7 MPa.m½ to 8.1 MPa.m½. The microstructure of the cladding layer changed from equiaxed crystal and columnar crystal to strip dendrite and cellular crystal. According to the thermal mechanical coupling results under different preheating temperatures, with the increase of preheating temperature, the residual stress in the cladding layer decreased obviously, the stress concentration in the cladding layer was reduced, and the cracking behavior of the cladding layer was restrained. The substrate preheating method can significantly reduce the residual stress in the cladding layer, improve the crack sensitivity of the cladding layer and enhance the toughness of the cladding layer. When the substrate is preheated at 200~300 ℃, the performance of the cladding layer is most obviously improved, which can provide a practical reference basis for inhibiting the occurrence of cracks in the preparation of ceramic coatings. |
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