Effect of Initial Temperature on the Microstructure and Properties of Stellite-6/Inconel 718 Functional Gradient Materials Formed by Laser Metal Deposition.
Effect of Initial Temperature on the Microstructure and Properties of Stellite-6/Inconel 718 Functional Gradient Materials Formed by Laser Metal Deposition.
复制标题
初始温度对激光金属沉积形成的 Stellite-6/Inconel 718 功能梯度材料微观结构和性能的影响。
DOI：
10.3390/ma14133609
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发表时间：
2021-06-28
期刊：
影响因子：
--
通讯作者：
Cheng G
中科院分区：
文献类型：
--
作者：
Yao J;Xin B;Gong Y;Cheng G
Stelite-6/Inconel 718梯度功能材料是一种在超高温（650-1100 °C）下具有优异强度性能的耐热梯度功能材料，在航空航天工程如发动机涡轮机叶片中具有潜在的应用前景。为了研究初始温度对激光金属沉积（LMD）功能梯度材料（FGM）组织和性能的影响，采用LMD技术在室温和预热（300 °C）两种初始温度下制备了Stellite-6/Inconel 718 FGM。分析在不同初始温度下以10%梯度形成的100%Stellite-6至100%Inconel 718 FGM的内部残余应力分布、元素分布、显微组织、拉伸性能和显微硬度。实验结果表明，较高的初始温度有效地改善了残余应力的不均匀分布。预热减缓了熔池的凝固时间，有利于气体的逸出和熔池中元素的均匀扩散。此外，预热减少了梯度层之间的结合面积，增强了层之间的冶金结合性能，改善了拉伸性能。与室温下制备的Stellite-6/Inconel 718功能梯度材料相比，300 °C下制备的Stellite-6/Inconel 718功能梯度材料的平均屈服强度、平均抗拉强度和平均伸长率分别提高了65.1 MPa、97 MPa和5.2%。但是，较高的初始温度会影响材料的硬度。在300 °C下形成的Stellite-6/Inconel 718 FGM的平均硬度比在20 °C下形成的Stellite-6/Inconel 718 FGM的平均硬度低26.9HV（维氏硬度）。
Stelite-6/Inconel 718 functionally gradient materials (FGM) is a heat-resisting functional gradient material with excellent strength performance under ultra-high temperatures (650–1100 °C) and, thus, has potential application in aeronautic and aerospace engineering such as engine turbine blade. To investigate the effect of initial temperature on the microstructure and properties of laser metal deposition (LMD) functional gradient material (FGM), this paper uses the LMD technique to form Stelite-6/Inconel 718 FGM at two different initial temperatures: room temperature and preheating (300 °C). Analysis of the internal residual stress distribution, elemental distribution, microstructure, tensile properties, and microhardness of 100% Stelite-6 to 100% Inconel 718 FGM formed at different initial temperatures in a 10% gradient. The experimental results prove that the high initial temperature effectively improves the uneven distribution of internal residual stresses. Preheating slows down the solidification time of the melt pool and facilitates the escape of gases and the homogeneous diffusion of elements in the melt pool. In addition, preheating reduces the bonding area between the gradient layers, enhancing the metallurgical bonding properties between the layers and improving the tensile properties. Compared with Stellite-6/Inconel 718 FGM formed at room temperature, the mean yield strength, mean tensile strength, and mean elongation of Stellite-6/Inconel 718 FGM formed at 300 °C are increased by 65.1 Mpa, 97 MPa, and 5.2%. However, the high initial temperature will affect the hardness of the material. The average hardness of Stellite-6/Inconel 718 FGM formed at 300 °C is 26.9 HV (Vickers hardness) lower than that of Stellite-6/Inconel 718 FGM formed at 20 °C.
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DOI：
10.3390/ma14071794
发表时间：
2021-04-05
期刊：
Materials (Basel, Switzerland)
影响因子：
--
作者：
Kim H;Lee KK;Ahn DG;Lee H
通讯作者：
Lee H
影响因子：
4
作者：
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通讯作者：
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DOI：
10.1007/s00170-012-4478-4
发表时间：
2013-06-01
影响因子：
3.4
作者：
Lestan, Zoran;Milfelner, Matjaz;Karabegovic, Isak
通讯作者：
Karabegovic, Isak
影响因子：
5
作者：
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