Effects of selective laser melting processing parameters on the densification and mechanical properties of Fe20Cr5Al alloy
LU Yang1, ZHAO Zhe1, MIING Liang1, HU Zijian1, XUE Xiangyuan1, DENG Xin1, LIU Jianye2, QI Wenjun2, NIU Liuhui2, GAO Wenhua2
1. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China; 2. Guangdong Hanbang 3D Technology Co., Ltd, Zhongshan 528427, China
Abstract：Fe20Cr5Al alloy vehicle exhaust purifier material was fabricated by 3D printing based on selective laser melting (SLM) forming technology. The relationship between printer parameters (laser power, scanning speed and scanning spacing) and the density of printed parts were systematically studied by using response surface experimental design. The relationship model between SLM forming parameters and density and the relationship model between printer parameters and mechanical properties were obtained, and the optimum SLM forming parameters were obtained. The results show that the effects of SLM process parameters on the density of printed parts are in the order of laser power, scanning speed and scanning spacing. The optimum SLM forming parameters are laser power of 314.8 W, scanning speed of 1 700 mm/s and scanning distance of 0.06 mm. The predicted relative density under this process parameter is 99.74%, and the average error with the SLM forming experiment result is only 0.16%. The model has high reliability, and the average actual relative density under the optimized process parameter is 99.58%. the tensile strength is 616.44 MPa, and the elongation is 1.513%.
[1] 赵志国, 柏林, 李黎, 等. 激光选区熔化成形技术的发展现状及研究进展[J]. 航空制造技术, 2014(19): 46-49. ZHAO Zhiguo, BO Lin, LI li, et al. Development status and research progress of laser selective melting forming technology[J]. Aeronautical Manufacturing Technology, 2014(19): 46-49. [2] FRAZIER W E.Metal additive manufacturing: A review[J]. Journal of Materials Engineering & Performance, 2014, 23(6): 1917-1928. [3] LI R, WANG M, YUAN T, et al.Selective laser melting of a novel Sc and Zr modified Al-6.2Mg alloy: Processing, microstructure, and properties[J]. Powder Technology, 2017(319): 117-128. [4] LI R, NIU P, YUAN T, et al.Selective laser melting of an equiatomic CoCrFeMnNi high-entropy alloy: Processability, non-equilibrium microstructure and mechanical property[J]. Journal of Alloys and Compounds, 2018(746): 125-134. [5] ZHOU L, YUAN T, LI R, et al.Microstructure and mechanical properties of selective laser melted biomaterial Ti-13Nb-13Zr compared to hot-forging[J]. Materials Science and Engineering A, 2018, 725: 329-340. [6] ZHOU L, YUAN T, LI R, et al.Selective laser melting of pure tantalum: Densification, microstructure and mechanical behaviors[J]. Materials Science and Engineering A, 2017, 707: 443-451. [7] 许佩敏, 孙旭东, 康彦, 等. 表面燃烧器用金属纤维制品的开发现状[J]. 产业用纺织品, 2018, 36(5): 1-7. XU Peimin, SUN Xudong, KANG Yan, et al.Development status of metal fiber products for surface burners[J]. Technical Textiles, 2008, 36(5): 1-7. [8] 玉洁, 周芸, 左孝青. 汽车尾气净化器载体的研究现状及发展[J]. 材料导报: 综述篇, 2012, 26(11): 66-69. YU Jie, ZHOU Yun, ZUO Xiaoqing.Research status and development of vehicle exhaust gas purifier carrier[J]. Materials Reports, 2012, 26(11): 66-69. [9] 张小庆, 许佩敏, 康彦, 等. 铁铬铝合金纤维针织物制备及性能研究[J]. 产业用纺织品, 2017, 35(5): 16-19, 33. ZHANG Xiaoqing, XU Peimin, KANG Yan, et al.Preparation and properties of ferrochrome aluminum alloy fiber knitted fabric[J]. Technical Textiles, 2017, 35(5): 16-19, 33. [10] 夏建国, 王少洪, 侯朝霞, 等. 多孔陶瓷在汽车尾气处理中的研究进展[J]. 兵器材料科学与工程, 2012, 35(4): 93-95. XIA Jianguo, WANG Shaohong, HOU Zhaoxia, et al.Research progress of porous ceramics in automobile exhaust treatment[J]. Ordnance Material Science and Engineering, 2012, 35(4): 93-95. [11] WANG Hongding LA Peiqing; LIU Xuemei,et al.Effect of chromium content on microstructure and mechanical properties of large dimensional bulk nanocrystalline based Fe-Al-Cr alloys prepared by aluminothermic reaction[J]. Materials and Design, 2013, 47(5): 125-132 [12] OBABE S, KOHNO M, ISHII K, et al.Oxidation resistence of rapidly solidified Fe-Cr-Al ribbons at high temperature[J]. Materials Science and Engineering A,1991 134: 1016-1020 [13] BAI Y, YANG Y, WANG D, et al.Selective laser melting of tin bronze alloy and Its properties[J]. Rare Metal Materials & Engineering, 2018, 47(3): 1007-1012 [14] QIN Q, CHEN G X. Effects of parameters on surface roughness of metal parts by selective laser melting[J]. Advanced Materials Research, 2014, 834/836: 872-875. [15] DOUGLAS C.Montgomery. Design and Analysis of Experiments[M]. Hoboken, New Jersey: John Wiley & Sons Inc, 2012: 256-289.
2019, Vol. 24 
