Repair and manufacturing of single crystal Ni-based superalloys components by laser powder deposition—A review
Repair and manufacturing of single crystal Ni-based superalloys components by laser powder deposition—A review
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DOI：
10.2351/1.4862697
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发表时间：
2015-02
影响因子：
2.1
通讯作者：
R. Vilar;A. Almeida
中科院分区：
文献类型：
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作者：
R. Vilar;A. Almeida
激光粉末沉积技术是修复燃气涡轮机热端镍基单晶高温合金部件的最有前途的方法之一，可以延长其使用寿命，降低其整体成本。沉积在类似材料的单晶衬底上的镍基高温合金的微观结构主要取决于所涉及的材料、沉积轨迹相对于衬底的取向以及沉积参数。本文讨论了在SRR 99和CMSX-4镍基高温合金（100）单晶基片上单层和多层沉积NiCrAlY和Rene N4的情况，并举例说明了这些关系。另一方面，当对激光沉积产生的凝固组织直接施加时效处理时，由于合金元素在凝固过程中分配产生的不均匀性，可能导致异常的γ/γ′组织。进行均匀化退火处理，
Laser powder deposition is one of the most promising methods for the repairing of the single crystal Ni-based superalloys components used in the hot-section of gas turbine engines in order to extend their lifetime and reduce their overall cost. The microstructure of Ni-based superalloys deposited on single crystal substrates of similar materials depends mainly on the materials involved, on the orientation of the deposited tracks in relation to the substrate and on the deposition parameters. In the present paper these relations are discussed and illustrated for the case of single and multiple layer depositions of NiCrAlY and Rene N4 on (100) single crystal substrates of SRR99 and CMSX-4 Ni-based superalloys. On the other hand, when the aging treatment is applied directly to the solidification microstructure resulting from laser deposition, abnormal γ/γ′ microstructures may result, due to the inhomogeneity created by alloying elements partition during solidification. Performing a homogenization annealing be...